Investigation of the mechanical properties and chemical resistance of PC/PBT/Impact modifier blends / M.-Y. Lyu in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 4 (12/2003)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVIII, N° 4 (12/2003) . - p. 382-387 Titre : Investigation of the mechanical properties and chemical resistance of PC/PBT/Impact modifier blends Type de document : texte imprimé Auteurs : M.-Y. Lyu, Auteur ; Y. Pae, Auteur ; C. Nah, Auteur Année de publication : 2003 Article en page(s) : p. 382-387 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Molding - Mechanical properties, flow characteristics and chemical resistance of polycarbonate (PC)/poly(butylene terephthalate) (PBT)/impact modifier (IM) blends were investigated over the wide composition range of PC and PBT. Mechanical properties of the PC/PBT/IM blends for two different IMs, butadiene based IM and butyl acrylate based IM, were studied. For the study of chemical resistance of the PC/PBT/IM blends, test specimens were dipped in solvent, thinner, and then variations of mechanical properties were analyzed. Tensile and flexural strengths were increased linearly and heat distortion temperature (HDT) also increased as PC content in the blends increased. Impact strength increased drastically as PC content in the blends increased up to 50wt.-%, and then it leveled out for over 50wt.-% of PC. Flowability of the blends decreased as PC content increased. Impact strengths of the blends were different from IMs specially at low temperatures. The blends with butyl acrylate based IM showed slightly higher impact strength than the blends with butadiene based IM at 0°C and room temperature. However, the blends with butadiene based IM showed remarkably higher impact strength than the blends with butyl acrylate based IM at the temperatures below 0°C. After the chemical treatment of test specimens, tensile and flexural strengths decreased, and impact strength increased as PC content in the blends increased. PC in the blends would become mild and ductile when it contacted with solvent, thus the impact strength increased while tensile and flexural strengths decreased. Note de contenu : - EXPERIMENTAL : Material and test specimen - Measurement of mechanical property and viscosity - Analysis of Morphology - Analysis of Chemical resistance - Results and discussion : Mechanical property and viscosity of the blends - Comparison of impact modifiers - Chemical resistance of the blends DOI : 10.3139/217.1756 En ligne : https://drive.google.com/file/d/1A38Jtw84qFUfzNo9Nactq20rIwykX6Dm/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15822 [article]

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Predicting the long-term creep behavior of plastics using the short-term creep test / S. D. Lim in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 3 (09/2004)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XIX, N° 3 (09/2004) . - p. 313-319 Titre : Predicting the long-term creep behavior of plastics using the short-term creep test Type de document : texte imprimé Auteurs : S. D. Lim, Auteur ; J. M. Rhee, Auteur ; C. Nah, Auteur ; S.-H. Lee, Auteur ; M.-Y. Lyu, Auteur Année de publication : 2004 Article en page(s) : p. 313-319 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The creep performance of plastics is one of the main criteria for a variety of applications which requires a strict dimensional stability, including electrical/electronic parts and various automotive applications. However, obtaining or generating accurate creep data is very difficult for both resin suppliers and product designers because the creep property is time dependent, which means it takes over several weeks or even a year of time span. Hence a faster and more reliable method predicting creep behavior of plastics is needed when designing plastic products that will encounter long-term loading. This work presents an easy method for predicting the long-term creep behavior of plastics using the short-term creep experimental data. The flexural creep experiments of three plastics, ABS (Acrylonitrile butadiene styrene), PC/ABS (PC and ABS alloy) and LFT (Long fiber reinforced thermoplastics), are performed. For a quick and reliable prediction of long-term creep behavior of plastics, time regional power-law model and time-stress modulus are introduced. To analyze the reliability and validity of the proposed method, the creep analyses based on the proposed method are performed. The comparison between the FEA results and the creep tests has shown that the new method can track both primary and secondary creep behavior over a long time. The creep analyses have been carried out by commercial FE Code. DOI : 10.3139/217.1826 En ligne : https://drive.google.com/file/d/19e_fUfrei-nrQZpDnyosWfj8tvFnLN5q/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3116 [article]

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