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Highly efficient adaptive fiber-composite rotor blade / Gero Pfizenmaier in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 5 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 5 (2021) . - p. 10-12 Titre : Highly efficient adaptive fiber-composite rotor blade : Additive manufacture of FRP injection molds for FRP components of small wind turbines Type de document : texte imprimé Auteurs : Gero Pfizenmaier, Auteur ; Lucas Ost, Auteur ; Jonas Krenz, Auteur ; Lars Ulke-Winter, Auteur ; Holger Seidlitz, Auteur ; Christian Beloch, Auteur Année de publication : 2021 Article en page(s) : p. 10-12 Langues : Anglais (eng) Catégories : Composites à fibres de verre Composites à fibres de verre -- Moulage par injection Eoliennes -- Matériaux Epoxydes Impression tridimensionnelle Matériaux -- Allègement Moules d'injection -- Conception et construction Pales d'éoliennes Polyuréthanes Index. décimale : 668.4 Plastiques, vinyles Résumé : Currently, small wind turbines can hardly be operated profitably in landlocked regions. This drawback has now been overcome by the partners EAB Gebäudetechnik Luckau GmbH and the Chair of Polymer-based Lightweight Design at the BTU Cottbus-Senftenberg : passive smartblades made from 3D-printed molds adapt independently to wind conditions. This is achieved by an intelligent layer structure and its bending-torsion-coupling. Note de contenu : - The inland path to profitable SWTs - Efficient product development thanks to modern simulation technology - CFD and FEM calculations : torsion under wind load - Figure : This newly developed rotor blade is especially suited for weak-wind regions and adapts independently to the wind load - Fig. 1 : Production-ready implementation of a rotor blade design with the profiles and the profile chord - Fig. 2 : Distribution of pressure on the rotor blade and Tsai-Wu failure criterion (TSAIW). There is no damage to the laminate at TSAIW < 1 - Fig. 3 : Regression curves (polynomial, degree 6) of torsion angle over blade length at a wind speed of 20 m/s - Fig. 4 : Development of the mold for manufacturing rotor blades. a) CAD model of the mold ; b) printed mold ; c) infusion of a rotor blade half ; d) rotor blade following gluing of both shell halves - Table : Process parameters in the hybrid production of mold halves En ligne : https://drive.google.com/file/d/1RLPMwrNHjoC_Ibj2A56sRcjkVkuoHEiD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36159 [article]

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Quality assurance for multiple cavities / Martin Ortgies in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 5 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 5 (2021) . - p. 13-15 Titre : Quality assurance for multiple cavities : Automating injection molding with process contrôl - with the example of a cube mold Type de document : texte imprimé Auteurs : Martin Ortgies, Auteur Année de publication : 2021 Article en page(s) : p. 13-15 Langues : Anglais (eng) Catégories : Assurance qualité Automatisation Canaux chauffants Capteurs (technologie) Matières plastiques -- Moulage par injection Pression -- Contrôle Procédés de fabrication Rhéologie Surveillance électronique Index. décimale : 668.4 Plastiques, vinyles Résumé : The Reversecube two-part cube mold is used to produce 60 million multicomponent parts per year on one production line and in the same process. The cycle times must be kept very short while at the same time maintaining stable processes and a high part quality. Sensor-based monitoring and automatic process control is therefore deployed in the form of Fillcontrol from Priamus. It consists of hot-runner balancing, viscosity and compression control as well as automatic holding pressure changeover. Note de contenu : - Hot-runner balancing evens out differences in filling time - Control loop reduces viscosity fluctuations - Compression regulation monitors the melt compression - Sensor technology reduces process cost and increases parts quality - Figure : The two halves of the reversecube cube mold, in stacked arrangement, rotate in 90° steps. Injection and cooling component 1, analogous to the component 2 above, which is offset by 180° - Fig. 2 : Different volumetric degrees of filling in the cavities can be identified with cavity temperature sensors. This balancing is evened out until all the cavities are filled simultaneously - Fig. 3 : Changeover via fixed values, such as screw path or cavity pressure threshold causes different degrees of filling in the event of viscosity fluctuations. The automatic changeover via the flow-front position balances out viscosity fluctuations. SL – switch level (limit value for manual configuration); SLP – switch level point (limit value accurately detected by the program/chip) En ligne : https://drive.google.com/file/d/1D6dHTnZlAcrVsPJ2BrTCvSHmTYsvOUaT/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36160 [article]

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An eye on the process - an handle on quality / Josef Giessauf in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 5 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 5 (2021) . - p. 16-19 Titre : An eye on the process - an handle on quality : A process monitoring platform monitors several hundred parameters simultaneously Type de document : texte imprimé Auteurs : Josef Giessauf, Auteur ; Georg Pillwein, Auteur ; Paul Kapeller, Auteur ; Johannes Kilian, Auteur Année de publication : 2021 Article en page(s) : p. 16-19 Langues : Anglais (eng) Catégories : Analyse des données Matières plastiques -- Moulage par injection Procédés de fabrication Qualité -- Contrôle Surveillance électronique Index. décimale : 668.4 Plastiques, vinyles Résumé : iQ process observer, the new process monitoring platform from Engel monitors hundreds of parameters from the injection molding cell in the background and presents deviations in such a way that the injection molder can easily identify them and their cause. In many cases, the new assistance system from the iQ product family even suggests a solution itself. In this way, the data analytics solution helps to reduce rejects and downtime. Note de contenu : - Data analysis - Replacement or aid for the expert ? - Traffic light symbols for the four process steps - The injection molding assistant puts it in plain languate - A "living" product - The benefit of networking - Figure : The injection molder is truly not a friend of changes – if they occur in the running process. The iQ process observer helps him to keep an eye on the process and thus keep a handle on the quality - Fig. 1 : The overview page of the iQ process observer summarizes all the information about the current process state - Fig. 2 : Example of the profile of process changes in the last 20 cycles: the specialist recognizes immediately that the actual value (yellow) changes were a consequence of the user changing the setpoint for backpressure – as can be seen from the pencil icon - Fig. 3 : When the process is looked at holistically, some of the machine extras offer an additional benefit alongside their actual use due to their integration into the monitoring software - Fig. 4 : The algorithms of the assistant run outside the machine on the Edge Device. The external computer also supplies data to web applications if required, and thus acts as a gateway to the world of digitalization En ligne : https://drive.google.com/file/d/1Lm97bRMTN9K-1w7p3jS2bEdHCeXHJRqx/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36161 [article]

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Well-balanced hot runner technology for LCP processing / Horst-Werner Bremmer in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 5 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 5 (2021) . - p. 20-23 Titre : Well-balanced hot runner technology for LCP processing : Connectors for industrial lifelines : high-tech injection molding at harting Type de document : texte imprimé Auteurs : Horst-Werner Bremmer, Auteur Année de publication : 2021 Article en page(s) : p. 20-23 Langues : Anglais (eng) Catégories : Canaux chauffants Equilibre thermique Matières plastiques -- Moulage par injection polymères cristaux liquides Index. décimale : 668.4 Plastiques, vinyles Résumé : Aside from offering high mechanical strength, versatility and durability, polymer materials are ideal for applications in the electrical industry because of their ability to isolate electrical current. For the production of connectors, Harting processes liquid crystal polymer (LCP), which lends itself to the production of intricate, thin-walled molded parts. LCP processing relies on hot runner systems that can guarantee a uniform thermal balance. Note de contenu : - The complexity of simplicity - Hot runner nozzles with a very good thermal profile - Thermal balance in the hot runner is essential - Punched strip accumulator installed upstream of the IM machine - 25 years' experience of LCP processing - Figure : For the conduction cooled MicroTCA systems, Harting processes LCP, a material that is flame-resistant, dimensionally stable at high temperatures, chemically resistant, and has only a low thermal expansion - Fig. 1 : Harting’s polymer molding shop also designs and adapts many new injection molds based on its own practical experience - Fig. 2 : Minimal cavity spacing, as can be seen here in a trade show exhibit fitted with the patented Blue Flow thick-film heating element (see Box p. 22), is key for many applications - Fig. 3 : "Lined up end to end, the 85 contact segments form the backplane for the printed circuit board," explains Mark Gosewehr - Fig. 4 : A camera checks that the 85 contact segments are correctly positioned. Only then is the strip carrying the segments fed automatically into the injection mold En ligne : https://drive.google.com/file/d/18XCnYh78DhDqGD2R27EUmRK0zWDoOM7M/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36162 [article]

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Toolmaking of the future - digitalized and sustainable / Wolfgang Boos in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 5 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 5 (2021) . - p. 24-26 Titre : Toolmaking of the future - digitalized and sustainable : What the two trend topics mean for collaboration betweentoolmaking and series production Type de document : texte imprimé Auteurs : Wolfgang Boos, Auteur ; Christoph Kelzenberg, Auteur ; Julian Boshof, Auteur ; Tim Graberg, Auteur Année de publication : 2021 Article en page(s) : p. 24-26 Langues : Anglais (eng) Catégories : Développement durable Matières plastiques -- Industrie Outillage Production Index. décimale : 668.4 Plastiques, vinyles Résumé : The toolmaking industry of the future is facing significant changes in its range of services and its value creation processes. It is difficult to predict exactly how the collaboration of German tool manufacturers with series production will be structured in the future. However, it can be assumed that digital networking and sustainability will play a key role. Note de contenu : - Digitally connected internally and externally according to requirements - Toolmaking as an enabler of sustainable series production - Fig. 1 : Target image of the digitalized tool shop to increase its own efficiency and support the series producer - Fig. 2 : Sustainable toolmaking also supports the sustainability agenda of the series producer with its measures En ligne : https://drive.google.com/file/d/1JlA-5GMbZzipXIAnK8njEzavd2pqH5jt/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36163 [article]

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Extrusion of high-performance thermoplastics / Franz Grajewski in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 5 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 5 (2021) . - p. 27-30 Titre : Extrusion of high-performance thermoplastics : An overview of plant engineering for product development and small-batch production Type de document : texte imprimé Auteurs : Franz Grajewski, Auteur Année de publication : 2021 Article en page(s) : p. 27-30 Langues : Anglais (eng) Catégories : Matières plastiques -- Extrusion -- Appareils et matériels Index. décimale : 668.4 Plastiques, vinyles Résumé : The production and processing of high-performance thermoplastics impose high demands on plant engineering. Things get hot in the extruder, with temperatures reachingup to 500°C during compounding or fabrication of pipes, multifilaments, flat film and blown film. Filament extrusion for 3D printing has proven to be particularly economic in small-batch production. Note de contenu : - High-performance compounders ans single-screw extruders - Special focus on calibration and cooling - PEI and PEEK pipes fabricated with low residual stress - Laminating unit for PEEK, LCP, PEI flat film and specialty laminates - PEEK, PEI, LCP blown film - Counter rotating die for high-performance blown films - MDO stretching of high-performance films - Multifilament PEEK, LCP, PPS - Filament extrusion for 3D printing - Fig. 1 : The ILK at the Technical University of Dresden uses this line to produce PEI and PEEK pipes of up to 25 mm diameter and a wall thickness of 0.5 mm - Fig. 2 : Illustration of the process for laminating Cu foil to PEI filled with talc - Fig. 3 : Line speeds of up to 50 m/min are achieved with the BL 600 P high-temperature blowing line - Fig. 4 : Die for high-performance blown film : a transverse component can be added to the orientation by rotating the mandrel and orifice - Fig. 5 : The MDO stretching line is vertically configured to save space. The stretching gaps are adjusted by motor to a value ranging from 0.2 to 10 mm - Fig. 6 : The extrusion section, cooling shaft and stretching unit of the multifilament line form an economic, copact unit En ligne : https://drive.google.com/file/d/1dNjgrbDcJMPOgZMMu8OCjgJxq0k9Slf4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36164 [article]

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Laser welding re-though / Frank Brunnecker in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 5 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 5 (2021) . - p. 31-33 Titre : Laser welding re-though : Increasing process efficiency through advaned quasi-simultaneous welding Type de document : texte imprimé Auteurs : Frank Brunnecker, Auteur ; Christian Ebenhöh, Auteur Année de publication : 2021 Article en page(s) : p. 31-33 Langues : Anglais (eng) Catégories : Assemblages (technologie) Matières plastiques -- Propriétés mécaniques Matières plastiques -- Soudage Polybutylène téréphtalate Polycarbonates Soudage laser Soudures Index. décimale : 668.4 Plastiques, vinyles Résumé : Evosys Laser GmbH has patented a new variant of laser welding that combines two laser beam sources and wavelengths. This approach is not limited to contour welding, but is particularly aimed at significantly reducing welding times and extending the process window in quasi-simultaneous welding. Note de contenu : - Better process control through selective energy input - Test setup with two plates - Experiment to reduce the welding time with plates made of PBT - PC in practical test for weld seam strength - Welding time is halved, tensil strength increases by one third - Fig. 1 : Test setup and welding configuration for advanced quasi-simultaneous welding - Fig. 2 : The number of overruns can be halved with AQW, thus ensuring a shorter welding time - Fig. 3 : The highest tensile strength with AQW is achieved at 75 % primary radiation – and is one third higher compared to the standard process En ligne : https://drive.google.com/file/d/1LGWQjEdyOBQszMmoXttv-I9yZc_H1qeb/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36165 [article]

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A perfect fit / Christoph Manger in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 5 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 5 (2021) . - p. 34-35 Titre : A perfect fit : Ultrasonically welded seals for sustainable packaging Type de document : texte imprimé Auteurs : Christoph Manger, Auteur Année de publication : 2021 Article en page(s) : p. 34-35 Langues : Anglais (eng) Catégories : Bioplastiques Emballages en matières plastiques Etanchéité Soudage par ultrasons Index. décimale : 668.4 Plastiques, vinyles Résumé : The use of bio-based plastic materials – accompanied by high prices, new packaging designs and frequent technical refinements – present packaging manufacturers with a whole range of challenges. As more biopolymer packaging makes its way to the market, ultrasonic welding is proving its worth in sealing these import new polymers. Today, modern vertical form, fill and seal machines (VFFS) are capable of sealing through the package contents. Note de contenu : - The sensitive material requires new sealing equipment - The advantages ultrasonic welding systems offer - Quality control immediately sorts out faulty batches - Fig. 1 : Reducing waste due to weld failures, Branson ultrasonic components for VFFS systems by Emerson can seal directly through package contents and other contaminants at the sealing point of a wide variety of product packages - Fig. 2 : The Bosch VIS aroma protection valve is connected to the packaging film by ultrasonic welding. The valve enables degassing and at the same time prevents the inflow of harmful oxygen - Fig. 3 : Ultrasonically welded seals ensure the integrity of Pocket Shot, a 50 ml, three-layer plastic film pouch containing various spirits. Pocket Shot is a durable alternative to plastic bottles for people on the go En ligne : https://drive.google.com/file/d/1ROpi4xe1Gr4_SHL5xBdxjvfqhVGlB_Xh/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36166 [article]

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So test therefore, who join forever / Eric Folz in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 5 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 5 (2021) . - p. 36-37 Titre : So test therefore, who join forever : Direct fastening into plastic for 3D printed components Type de document : texte imprimé Auteurs : Eric Folz, Auteur ; Volker Dieckmann, Auteur Année de publication : 2021 Article en page(s) : p. 36-37 Langues : Anglais (eng) Catégories : Assemblages (technologie) Composites à fibres de carbone Impression tridimensionnelle Polyamide 66 Polypropylène Vis Index. décimale : 668.4 Plastiques, vinyles Résumé : Alongside clip joints, welding and cementing, the incorporation of technical screw connections into the component assembly is one of the most important jointing methods. Together with the screw manufacturer Ejot, the compound producer Lehvoss has investigated the suitability of 3D printed components for screw connections. Three materials underwent the practical test for this purpose. Note de contenu : - Unreinforced polypropylene attained the customary values in the test - Better scores for polypropylene with carbon fiber-reinforcement (PP/CF) - A reliable jointing technique for PA/CF - High-strength materials across all axes of strain - Fig. 1 : On the left, the injection-molded screw boss, in the center the printed version. On the right of the picture, the Ejot Evo PT screw - Fig. 2 : A view inside the Lehvoss pilot plant for 3D printing. Materials were investigated for use in FFF (Fused Filament Fabrication) En ligne : https://drive.google.com/file/d/18ZPT3DOPxYztBjv3JEyQaZbdxz1A9sJC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36167 [article]

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Ultrathin bipolar plates for fuel cells / Thorsten Hickmann in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 5 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 5 (2021) . - p. 38-40 Titre : Ultrathin bipolar plates for fuel cells : Modified conductive compounds make it possible to manufacture bipolar plates from a bipolar film coil Type de document : texte imprimé Auteurs : Thorsten Hickmann, Auteur ; Thorsten Derieth, Auteur Année de publication : 2021 Article en page(s) : p. 38-40 Langues : Anglais (eng) Catégories : Composites à fibres de graphite Conducteurs organiques Emboutissage Films plastiques Films plastiques -- Propriétés mécaniques Graphite Piles à combustible Pliage (mécanique) Polyéthylène Polyfluorure de vinylidène Polypropylène Polysulfures de phénylène Résistance électrique Index. décimale : 668.4 Plastiques, vinyles Résumé : Bipolar plates are one of the key components of fuel cells and redox flow batteries. They consist of plastics compounds highly filled with electrically conductive materials. To save space, cut costs, and reduce weight, there is increasing demand for the production of thinner plates without compromising robustness and service life. This can be achieved using modified polymers. With a new technology, bipolar plate films based on these modified polymers can be processed as coils. Note de contenu : - Challenge : Thin but durable - Modified films achieve the required values - Coil processing is possible - Figure : The modified polymers enable films to be processed as coils - Fig. 1 : By modifying the highly filled plastics, considerably thinner bipolar plate films can be produced than was previously the case - Fig. 2 : Film thickness of the processed compounds and comparison with reference materials (filling degrees in brackets) : the thickness of the plates ranges between about 0.5 and 1 mm - Fig. 3 : The tensile strength of the different films is lower than that of the reference materials. However, the reference materials are also considerably thicker (3 mm) - Fig. 4 : The electrical resistance of the compounds (filling degrees in brackets) is higher than that of the reference materials. However, this is compensated for by the lower thickness of the films - Fig. 5 : Stamped graphite compound film : the bipolar plate is produced by the stamping/ bending process En ligne : https://drive.google.com/file/d/1n7ao1giAoz3sk2teppAwRxmgGVpFTlgv/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36168 [article]

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Direct route to the PVC profile / Serhiy Yatsenko in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 5 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 5 (2021) . - p. 41-45 Titre : Direct route to the PVC profile : Extrusion of rigid PVC without dry blend production Type de document : texte imprimé Auteurs : Serhiy Yatsenko, Auteur ; Johannes Rudloff, Auteur ; Marc Waffenschmidt, Auteur ; Marieluise Lang, Auteur ; Thomas Hochrein, Auteur ; Martin Bastian, Auteur Année de publication : 2021 Article en page(s) : p. 41-45 Langues : Anglais (eng) Catégories : Chlorure de polyvinyle Extrudeuse à rouleau planétaire Matières plastiques -- Extrusion Profilés Index. décimale : 668.4 Plastiques, vinyles Résumé : Before the direct extrusion of profiles made of polyvinyl chloride was developed, it was previously necessary to produce a dry blend. This process is expensive and energy-intensive and, in contrast to direct extrusion, discontinuous. The direct extrusion of PVC using planetary roller extruders promises an improvement. In addition to soft PVC, rigid PVC can also be processed in this way with a few adjustments. Note de contenu : - Potential savings due to planetary roller extruders - Challenges in setting up the direct extrusion line - PVC granulates as alternatives to dry blends - Which pressure build-up unit is suitable ? - Successful tests of the prototype line - Figure : The direct extrusion of PVC profiles on planetary roller extruders can save costs and energy and simplify the process - Fig. 1 : Schematic view of a process module of the PRE: several planetary spindles rotate around the temperature-controlled central spindle in a temperature-controlled cylinder assembly - Fig. 2 : With current PRE types, several process modules are connected in series. Moreover, additional systems for process improvement can be integrated - Fig. 3 : The two-module PRE has already proven itself for soft PVC. A few adjustments were necessary for processing rigid PVC - Fig. 4 : Schematic view of the direct extrusion line for rigid PVC: a connected pressure build-up unit provides the pressure required for extrusion - Fig. 5 : Results of the gel permeation-chromatographic test with the two-module PRE set-up: the mean molar mass of the three samples is largely identical - Fig. 6 : The sample PRE has a slightly lower tensile strength than the samples processed in the other two processes - Fig. 7 : In the tests of the Charpy impact strength, the sample processed in the PRE fell significantly below the other two. However, if three modules are used instead of two, it even achieves better values - Fig. 8 : With the installed line, a direct extrusion of rigid PVC using planetary roller extruders is possible En ligne : https://drive.google.com/file/d/1YXaha4wtLy2FjyADD6qR6THm6_yZWiEt/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36169 [article]

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Measurements without hardware exchange / Jelena Fischer in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 5 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 5 (2021) . - p. 46-49 Titre : Measurements without hardware exchange : Characterize plastic surfaces more easily with Atomic Force Microscopy Type de document : texte imprimé Auteurs : Jelena Fischer, Auteur ; Dirk Meister, Auteur ; Michael Schäffler, Auteur Année de publication : 2021 Article en page(s) : p. 46-49 Langues : Anglais (eng) Catégories : Capteurs (technologie) Caractérisation Films plastiques Mesure Microscopie à force atomique Polyméthacrylate de méthyle Le poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec. Index. décimale : 668.4 Plastiques, vinyles Résumé : Atomic force microscopy can be used to determine various properties of polymer surfaces. However, until now it was still necessary to change the hardware on the probe for different measurement methods. A special sensor technology eliminates the need to replace the head. The example of an investigation of a polymer thin film shows how this enables the precise characterization of polymers. Note de contenu : - CRAI measurement reveals height difference - Two pass technique for the determinationof contact potential difference - Differences in contact potential show differences in material composition - Combination of measurement methods enables accurate characterization - Figure : With the Tosca series, all AFM measurements can be carried out with only one actuator body and thus without hardware exchange - Fig. 1 : Insertion of the actuator body with cantilever into the AFM: the z-sensor is integrated in the compact and lightweight actuator body without any cables - Fig. 2 : Schematic representation of the CRAI measuring principle: differences in the stiffness of the specimen and a height image are generated - Fig. 3 : The height image from the CRAI investigation reveals height differences in the polymer thin film. The determined islands are higher than the matrix - Fig. 4 : The CRAI measurement shows a contrast in the amplitude (left) and the phase (right). This indicates that the higher structures consist of not only of one but of both polymers - Fig. 5 : Schematic representation of the force-distance curve (FDC): the force between the probe and the sample is measured as a function of the distance the probe moves - Fig. 6 : Measurement of the force-distance curve (FDC) - Fig. 7 : In the KPFM, the height information is determined by tapping mode scan in the first pass. The second pass (lift) with the cantilever lifted takes place at a constant height above the sample - Fig. 8 : Superposition of 3D CRAI amplitude and contact potential difference (CPD) shows the higher potential difference for structures which are mainly composed of one polymer En ligne : https://drive.google.com/file/d/1meLq45-FbzyNKZ1PwigA7mBdcYnUwjCr/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36170 [article]

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