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Titre : A cost-effective alternative : Off-grade polypropylene instead of virgin resin Type de document : texte imprimé Auteurs : Thomas Beer, Auteur Année de publication : 2014 Article en page(s) : p. 84-85 Langues : Anglais (eng) Catégories : Economies d'énergie
Matières plastiques -- Additifs
Mélanges-maîtres (chimie)
Polypropylène
Temps de cycle (production) -- RéductionIndex. décimale : 668.4 Plastiques, vinyles Résumé : New, demanding applications raise the standards that need to be met by plastics. In addition, higher prices for raw materials and electricity translate into additional cost when manufacturing plastic products. Using less expensive off-grade material instead of expensive virgin resin represents one possible remedy. Specific processing aids make this possible. Note de contenu : - Improved flow characteristics
- Comparable processingEn ligne : https://drive.google.com/file/d/1gpB0V58FgSR0uL-7Zh5x3FFfi7CNk5fw/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22347
in KUNSTSTOFFE INTERNATIONAL > Vol. 104, N° 9 (09/2014) . - p. 84-85[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16514 - Périodique Bibliothèque principale Documentaires Disponible A criterion for the formation of fibrillar layers in injection molded parts / R. Pantani in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 3 (07/2018)
[article]
Titre : A criterion for the formation of fibrillar layers in injection molded parts Type de document : texte imprimé Auteurs : R. Pantani, Auteur ; Vito Speranza, Auteur ; G. Titomanlio Année de publication : 2018 Article en page(s) : p. 355-362 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection
Polypropylène
Simulation par ordinateur
Structures fibrillairesIndex. décimale : 668.4 Plastiques, vinyles Résumé : It is quite well known that the morphology of an injection molded part made by a semicrystalline polymer presents several layers. In particular spherulitic structures are found in the core region, a layer characterized by highly oriented fibrillar morphology (the shear layer) usually follows and a skin layer is often observed at the sample surface. The thickness of the fibrillar layer deeply influences the mechanical properties of the part. In this work, a criterion to predict the thickness of the fibrillar layer is proposed and verified. The criterion is essentially based on the amount of viscous work done when the molecular stretch is higher than a critical value: the molecular stretch should be above a critical value while a critical amount of viscous work is accumulated. In order to tune the parameters, and to validate the criterion, a well characterized polypropylene was chosen as test material, and four different injection molding conditions were analyzed. The criterion is verified by comparing some experimental results with the prediction of the UNISA code (an injection molding software developed at the University of Salerno), good comparison between software predictions and experimental data confirms the suitability of the criterion. Note de contenu : - INJECTION MOLDING DATA AND PROCESS SIMULATION
- INJECTION MOLDING SIMULATIONS : Definition of the molecular stretch parameter - Final distributions of stretch and work and their evolutions
- APPLICATION OF THE SIMULTANEITY CRITERIONDOI : 10.3139/217.3543 En ligne : https://www.degruyter.com/document/doi/10.3139/217.3543/pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30804
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 3 (07/2018) . - p. 355-362[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20044 - Périodique Bibliothèque principale Documentaires Disponible Crystallization behavior and mechanical properties of nanosilica-reinforced isotactic polypropylene composites / J. Li in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 5 (11/2015)
[article]
Titre : Crystallization behavior and mechanical properties of nanosilica-reinforced isotactic polypropylene composites Type de document : texte imprimé Auteurs : J. Li, Auteur ; L.-J. Long, Auteur ; W.-T. He, Auteur ; K. Zhang, Auteur ; Y.-S. Xiang, Auteur ; J. Zhang, Auteur ; M.-M. Zhang, Auteur ; C.-P. Yang, Auteur ; J. Yu, Auteur Année de publication : 2015 Article en page(s) : p. 542-547 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Charges (matériaux)
Flexion (mécanique)
Gel de silice
Nanoparticules
Polymères -- Propriétés mécaniques
Polymères isotactiques
Polypropylène
Résistance au chocs
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.
Structure cristalline (solide)
Traction (mécanique)Index. décimale : 668.9 Polymères Résumé : Two different types of inorganic silica fillers, nano-silica powder (NSP) and colloidal silica sol (CSS) were added into isotactic polypropylene (iPP) with low silica content (0.2 wt%) and the influence of the two silica fillers on the crystallization behavior and mechanical properties of iPP were investigated. Differential scanning calorimeter (DSC) results showed that the crystallization temperature of iPP with CSS and NSP were increased by 4.1 °C, and 2.4 °C, respectively. The tensile strength, flexural strength, and izod impact strength of iPP/CSS (33.75 MPa, 33.04 MPa, and 4.80 kJ/m2) were higher than that of iPP/NSP (32.09 MPa, 32.27 MPa, and 4.25 kJ/m2). In addition, the haze value of iPP/CSS was decreased from 37.6 % to 27.6 %, which was 4.7 % lower than that of iPP/NSP (32.3 %). The better performance of CSS as ascribed to its better dispersion ability in iPP matrix than NSP, and it was verified by scanning electron micrograph (SEM) and transmission electron microscope (TEM). Overall, these results indicated that inorganic silica sols had a potential application in the nanoparticle-reinforced composites field. Note de contenu : - EXPERIMENTAL : Raw materials - Preparation of iPP/silica composites - Characterization
- RESULT AND DISCUSSION : Crystalline structure and crystallization behaviorDOI : 10.3139/217.3065 En ligne : https://drive.google.com/file/d/1TckKt9TRURlEoVI-WZbYRc0LDIc3Gqeg/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24815
in INTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 5 (11/2015) . - p. 542-547[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17557 - Périodique Bibliothèque principale Documentaires Disponible Crystallization behavior of polypropylene-graft-cardanol prepared by reactive extrusion / Q. Chen in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 1 (03/2013)
[article]
Titre : Crystallization behavior of polypropylene-graft-cardanol prepared by reactive extrusion Type de document : texte imprimé Auteurs : Q. Chen, Auteur ; F. Yin, Auteur ; L. Zheng, Auteur ; X. Xiao, Auteur ; J. Lin, Auteur Année de publication : 2013 Article en page(s) : p. 43-48 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cardanol
Copolymères greffés
Cristallisation
Extrusion réactive
Nucléation
Peroxyde de dicumyle
PolypropylèneIndex. décimale : 668.4 Plastiques, vinyles Résumé : The polypropylene-graft-cardanol (CAPP) was prepared by reactive extrusion of polypropylene (PP), dicumyl peroxide (DCP) and cardanol. Differential scanning calorimeter, polarizing microscope and wide-angle X-ray diffraction were used to evaluate the effects of DCP and cardanol on the nucleation and crystallization of PP. Results indicated that DCP could work as crystallization nucleator for PP and cardanol could afford the impurity needed at the small angle kick pleat of lamellae during spherulite growth. For the effect of DCP on nucleation, it was found that the crystallization rate of PP was enhanced by 2 to 3 times by the addition of 0.2% DCP. For the effect of cardanol on spherulite growth, it was found that the growth rates of CAPP were increased from 10.9 µm · min–1 to 13.5 µm · min–1 by the addition of 5% cardanol. Due to the nucleation effect of DCP, the total crystallization rates of degraded PP initiated by DCP at the process of reactive extrusion (dPP) and of CAPP were quicker than that of PP. Attributed to the promotion by cardanol, the spherulite grew more perfectly in CAPP than in PP, so Avrami exponents of PP increased from 2.1 – 2.5 to 3.1 –3.5 by the addition of cardanol. Note de contenu : - EXPERIMENTAL : Materials - Preparation of PP-g-cardanol - Grafting ration measurements - Nonisothermal crystallization - isothermal crystallization- Spherulite growth rate measurements - X-ray diffraction analysis
- RESULTS AND DISCUSSION : Effect of cardanol concentration on the nonisothermal crystallization of capps - Isothermal crystallization behavior of Capps - Spherulite growth rate - Crystalline structure analyzed by WAXDDOI : 10.3139/217.2649 En ligne : https://drive.google.com/file/d/1un9nop2sy-KrTMjvGAcjQzLZOmaJlxVH/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17763
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 1 (03/2013) . - p. 43-48[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14763 - Périodique Bibliothèque principale Documentaires Disponible Crystallization in polymer melts : metamorphism of flow induced nuclei / Hermann Janeschitz-Kriegl in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 4 (09/2011)
[article]
Titre : Crystallization in polymer melts : metamorphism of flow induced nuclei Type de document : texte imprimé Auteurs : Hermann Janeschitz-Kriegl, Auteur ; E. Ratajski, Auteur Année de publication : 2011 Article en page(s) : p. 460-463 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cristallisation
Ecoulement cisaillé
Etat fondu (matériaux)
Nucléation
Polarisation (lumière)
Polypropylène
vision des couleursIndex. décimale : 668.9 Polymères Résumé : As is well-known, characteristic complementary colors are obtained, if a λ-plate is introduced in white polarized light. This fact is used for an unexpected characterization of nucleation occurring during short term shearing of supercooled melts of iPP. Blue specks show up some time after cessation of flow on a red background. The blue color indicates that these tiny nuclei are oriented in the direction of previous flow. With prolonged waiting these specks extend over a large volume. At their centers spherulites start growing. DOI : 10.3139/217.2515 En ligne : https://drive.google.com/file/d/117GPNomCIqiTJe-6kqJAapV4x8LcinsE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12451
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 4 (09/2011) . - p. 460-463[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 013208 - Périodique Bibliothèque principale Documentaires Disponible Crystallization kinetics for PP/EPDM/Nano-CaCO2 composites - The influence of nanoparticles distribution / L. Gong in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 2 (05/2015)
PermalinkCrystallization of polymers in processing conditions : An overview / Jean-Marc Haudin in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 5 (11/2017)
PermalinkCustomized performance / Martin Geissinger in KUNSTSTOFFE INTERNATIONAL, Vol. 103, N° 8 (08/2013)
PermalinkDalles en béton renforcées par des grilles composites / K. Ait Tahar in MATERIAUX & TECHNIQUES, Vol. 99, N° 3 (2011)
PermalinkDéfauts d'aspect des pièces injectées / Marie-France Lacrampe in CAOUTCHOUCS & PLASTIQUES, N° 797 (09/2001)
PermalinkDégradation thermique du polypropylène au cours du rotomoulage - Partie I. Simulation du transfert thermique / S. Sarrabi in MATERIAUX & TECHNIQUES, Vol. 96, N° 6 (2008)
PermalinkDégradation thermique du polypropylène au cours du rotomoulage - Partie II. Modélisation cinétique de la thermooxydation / S. Sarrabi in MATERIAUX & TECHNIQUES, Vol. 96, N° 6 (2008)
PermalinkDégradation des thermoplastiques / Géraldine Rames-Langlade in CAOUTCHOUCS & PLASTIQUES, N° 830 (04/2005)
PermalinkDesign and synthesis of diazirine-containing dyes for polypropylene fibre : A study on the effect of alkyl chain / Guangluo Guo in COLORATION TECHNOLOGY, Vol. 138, N° 5 (10/2022)
PermalinkDesign fonctionel organique et composites entièrement recyclables in TEXTILES A USAGES TECHNIQUES (TUT), N° 71 (03-04-05/2009)
PermalinkDesign guidelines to balance the flow distribution in complex profile extrusion dies / A. Rajkumar in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 1 (03/2017)
PermalinkDesign methodology for parts subject to internal pressure / Thorsten Krumpholz in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 2 (2022)
PermalinkDetermining mechanical properties at every stroke / Kilian Dietl in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 12 (12/2019)
PermalinkDevelopment of dispersion during compounding and extrusion of polypropylene/graphite nanoplates composites / P. Rodrigues in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 5 (11/2017)
PermalinkDevelopment of high pressure injection technology for normal hydraulic injection molding machines / M. C. Song in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 1 (03/2018)
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