Achieving high service temperatures with thermoplastic elastomers / R. Himes in ADHESIVES AGE, Vol. 40, N° 4 (04/1997)  

[article]  inADHESIVES AGE > Vol. 40, N° 4 (04/1997) . - p. 28-32 Titre : Achieving high service temperatures with thermoplastic elastomers Type de document : texte imprimé Auteurs : R. Himes, Auteur ; D. R. Hansen, Auteur ; D. L. Shafer, Auteur ; S. L. Fulton, Auteur Année de publication : 1997 Article en page(s) : p. 28-32 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs thermofusibles Copolymère styrène-éthylène-butadiène Copolymères séquencés Elastomères thermoplastiques Ether de polyphénylène Faisceaux électroniques Formulation (Génie chimique) Mastics thermofusibles Matières premières Réticulation (polymérisation) Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Styrenic block copolymers are quite useful in many adhesive applications. They can be processed as hot melts at high line speeds or as high solids solution coatings. The thermoplastic nature of the styrene endblocks allows the reversible transition from rigid, reinforcing "physical crosslinks" to a soft, easy processing polymer. At temperatures below the glass transition ([T.sub.g]) of the styrene domains (approximately 95°C), the copolymers exhibit properties of a reinforced vulcanized elastomer with tensile strengths up to 35 Mpa in the neat form. At temperatures above the polystyrene Tg, the network weakens and flow is possible. Thus, most styrenic block copolymer adhesive formulations are limited to service temperatures of [less than or equal to] 90°C. Improvements to the service temperature of styrenic block copolymers have been made by electron beam or UV crosslinking star type block copolymers (1). However, not every application can utilize this technique. Many applications, such as automotive or construction applications, would benefit from adhesives which can be hot melt or solvent applied but which have upper service temperatures in the 100-150 [degrees] C range. Blending with endblock compatible resins is a potential approach. However, most conventional end-block resins cannot raise the glass transition temperature of the styrene endblocks because they have Tgs around the same value as polystyrene. Polyphenylene ether is one of the few polymers that is compatible with polystyrene (2) and that has a glass transition temperature in the range of 130°C to 214°C depending upon the molecular weight (Table I). Adding polyphenylene ether to styrenic block copolymers has been considered before (3, 4, 5, 6), but it has been difficult to commercially practice because of the high viscosities and because of the required high processing temperatures. A new low molecular weight polyphenylene ether, which may be available soon in developmental quantities, shows great promise for easy incorporation into SEBS (styrene-ethylene/butylene-styrene) adhesive systems to significantly increase the service temperature properties. Note de contenu : - Polyphenylene ether - Materials evaluated - Formulations - Service temperature results - Lower viscosity TPEs - Endblock Reinforcing En ligne : https://drive.google.com/file/d/1Z_7h7jHiKKwek8tw5S8ke7prAnG6Htqy/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20390 [article]

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Effect of poly(phenylene sulfide) (PPS) as functional additive on the physical properties of poly(phenylene ether) (PPS)/PPS blends / D. K. Kim in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 3 (07/2020)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 3 (07/2020) . - p. 268-280 Titre : Effect of poly(phenylene sulfide) (PPS) as functional additive on the physical properties of poly(phenylene ether) (PPS)/PPS blends Type de document : texte imprimé Auteurs : D. K. Kim, Auteur ; K. H. Song, Auteur ; Seung Sang Hwang, Auteur Année de publication : 2020 Article en page(s) : p. 268-280 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Additifs Alliages polymères Alliages polymères -- propriétés mécaniques Analyse thermique Ether de polyphénylène Matières plastiques -- Additifs Morphologie (matériaux) Polymères -- Additifs Polysulfures de phénylène Résistance chimique Rhéologie Test d'immersion Index. décimale : 668.4 Plastiques, vinyles Résumé : In this study, polyphenylene sulfide (PPS) was introduced in polyphenylene ether (PPE) blend to improve the processability of PPE and to secure the flame retardancy of the blend without deteriorating physical properties. Through the study of the binary blend of PPE/PPS, it was found that the shear thinning behavior and the external lubrication effect of PPS can improve the processability of PPE. Thermal analysis of the blend showed that the glass transition temperature of the PPS component decreases by the plasticization while that of the PPE component increases by the anti-plasticization effect. The modulus of the binary blend increased with the PPS content, and the tensile strength decreased but followed the additive rule. The change in tensile properties can be explained by the synergy effect of partial miscibility between PPE and PPS due to structural similarity, and non-isotropic morphology formation. Impact strength increased sharply in PPE60 due to the mechanical grafting effect by co-continuous phase formation. In the ternary blend with SEBS-MAH applied to PPE60, the impact strength steep increased at a content of 10 wt% or more due to the dramatic morphology change based on the compatibilization effect. Flame retardancy of V0 was also observed in all compositions where SEBS-MAH was applied within 20 phr. Note de contenu : - EXPERIMENTAL : Materials - Preparation of PPE/PPS blends - Mechanical properties - Thermal analysis - Morphology - Immersion test in liquid chemicals - UL94V measurement - Rheological behavior - RESULTS AND DISCUSSION : Binary blends - Ternary blends DOI : https://doi.org/10.3139/217.3919 En ligne : https://drive.google.com/file/d/18xsoispeRRq1gWe3NlwAGYcvOtRtk_1c/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34493 [article]

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High heat performance / Iain Montgomery in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 198, N° 4521 (02/2008)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 198, N° 4521 (02/2008) . - p. 39-40 Titre : High heat performance Type de document : texte imprimé Auteurs : Iain Montgomery, Auteur ; Marcel Verhagen, Auteur Année de publication : 2008 Article en page(s) : p. 39-40 Langues : Anglais (eng) Catégories : Charges (matériaux) Ether de polyphénylène Polyamides Un polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine. Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères. Revêtements -- Propriétés thermiques Revêtements poudre Index. décimale : 667.9 Revêtements et enduits Résumé : There is an emerging technology, which delivers conductivity plus high heat performance for the coating of plastics. Powder coating is a fast-growing technology due mainly to its enviromental benefits, particularly the elimination of solvents and related compounds that are emitted into the air in conventional liquid paint. Powder coating has traditionally been used with metal substrates ; however, the need for greater design freedom has led to industry demand for technologies suitable for plastic substrates. Lightweigh, high-performance and adaptable plastics offer many advantages over metals in applications ranging from mobile phones and TVs to automotive body panels and tractor hoods. The challenge has been finding successful approaches to the key issues of powder coating these materials : conductivity to attract the coating and high heat performance to withstand the cure cycle. There have been three majors paths to this goal. Note de contenu : - Reaching the objectives - Design freedom - Solving drawbacks En ligne : https://drive.google.com/file/d/1Mo0e4RJwFXHWbY8_WUXqMzhGKJ18qGFq/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27256 [article]

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Processing and characterization of polyphenylene ether/polystyrene/nylon-6 ternary blends / P. Hadimani in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 2 (05/2020)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 2 (05/2020) . - p. 169-183 Titre : Processing and characterization of polyphenylene ether/polystyrene/nylon-6 ternary blends Type de document : texte imprimé Auteurs : P. Hadimani, Auteur ; H. N. Narasimha Murthy, Auteur ; R. Mudbidre, Auteur Année de publication : 2020 Article en page(s) : p. 169-183 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Alliages polymères -- propriétés mécaniques Caractérisation Ether de polyphénylène Extrudeuse bi-vis Extrudeuse rotative Matières plastiques -- Extrusion Polyamide 6 Polystyrène Stabilité dimensionnelle Stabilité thermique Transition vitreuse Index. décimale : 668.4 Plastiques, vinyles Résumé : Polyphenylene ether (PPE) is a polymer with very high glass transition temperature, superior thermal stability but poor melt processability. Mainly to improve its processability and chemical resistance, it is blended with Polystyrene (PS) and Nylon-6, respectively. In this research, ternary blends of PPE/PS/Nylon-6 were prepared using co-rotating twin screw extrusion and test specimens were injection molded. The influence of Maleic anhydride and screw speed on the mechanical and thermal properties of the ternary blends was investigated. The 40/40/20 blends, without Maleic anhydride, processed at screw speed of 600 min–1 showed highest tensile, flexural and impact strengths of 65.74 MPa, 82.22 MPa and 8.88 kJ/m2, respectively. Complete miscibility of the three polymers in the ternary blend was evidenced by scanning electron micrographs. Glass transition temperature of the ternary blend was 127 °C. High thermal and dimensional stability of the blend was evidenced by lowest volatile mass and highest residual mass at 800 °C along with decomposition temperature of 458.6 °C. Maleic anhydride was not effective as compatibilizer in improving the mechanical properties of the ternary blend. Note de contenu : - EXPERIMENTAL DETAILS : Materials and processes - Testing of PPE/PS/Nylon-6 blends - Density, moisture absorption and thermal analysis - Scanning Electron Micrography - RESULTS AND DISCUSSION : Mechanical testing of PPE/PS/Nylon-6 blends - Process parameters and spectrophotometric data of PPE/PS/Nylon-6 blend - DSC and miscibility studies - Thermo-gravimetric analysis studies - Fourier Transform Infrared (FTIR) spectroscopy - MORPHOLOGY DOI : https://doi.org/10.3139/217.3864 En ligne : https://drive.google.com/file/d/1bvqH1rxejh8jNkwWfo1TWLHmRiNHKCyc/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34011 [article]

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Synergies from the far east / Takehiro Sakita in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 3 (03/2018)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 3 (03/2018) . - p. 29-32 Titre : Synergies from the far east : From the prototype of the first lithium-ion battery to thermoplastics for electrification Type de document : texte imprimé Auteurs : Takehiro Sakita, Auteur Année de publication : 2018 Article en page(s) : p. 29-32 Langues : Anglais (eng) Catégories : Alliages polymères Ether de polyphénylène Matières plastiques dans les automobiles Polypropylène Thermoplastiques Une matière thermoplastique désigne une matière qui se ramollit (parfois on observe une fusion franche) d'une façon répétée lorsqu'elle est chauffée au-dessus d'une certaine température, mais qui, au-dessous, redevient dure. Une telle matière conservera donc toujours de manière réversible sa thermoplasticité initiale. Cette qualité rend le matériau thermoplastique potentiellement recyclable (après broyage). Cela implique que la matière ramollie ne soit pas thermiquement dégradée et que les contraintes mécaniques de cisaillement introduites par un procédé de mise en forme ne modifient pas la structure moléculaire. Véhicules électriques Index. décimale : 668.4 Plastiques, vinyles Résumé : The change in drive-train technology from the conventional combustion engine to the electric drive poses a big challenge for car manufacturers and suppliers alike. Engineering plastics have versatile properties that offer a wide potential for applications in electric vehicles. Note de contenu : - One-stop provider of products and services - Inventor of the lithium-ion battery - Thermoplastics for electrification - Four case examples demonstrate the requirements and applications - A roadworthy concept car - Fig. 1. Despite intensified efforts to achieve lightweight designs, the average weight of European cars his risen in recent years - Fig. 2. The production figures for electric drive-train cars in Europe lead to the assumption that production of cars with alternative drive trains will increase greatly in the next years - Fig. 3. The door mirror stay consists of unpainted injection molded PA Leone 90G. The material can be processed at a relativeiy low mold temperature - Fig. 5. For the nickel-metal hydride battery in the Toyota Prius, a polymer alloy of polypropylene and polyphenylene ether (PP/PPE) was developed - Fig. 6. Prototype of an injection molded battery spacer. It provides electrical insulation between the individual cens - Fig. 7. Sunforce¬mo d ified polyphenylene ether (m-PPF) is processed as foam beads. It is similar to EPP, but additionally has V-0 flame retardancy and good dimensional stability En ligne : https://drive.google.com/file/d/1Yar3ZNs0JIhu-Ur5YYsVDmEyUERam8Zu/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30249 [article]

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Le textile de demain produira de l'énergie in INDUSTRIE & TECHNOLOGIES, N° 971-972 (12/2014)

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Thermoplastic polyurethanes containing hydrophobic polyphenylene ether polyols / Edward N. Peters in COATINGS WORLD, Vol. 23, N° 3 (03/2018)  

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