Melt creep recovery of polyamide 6 and polypropylene nanocomposites blended with layered silicate / G.-G. Lin in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 1 (03/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 1 (03/2016) . - p. 11-17 Titre : Melt creep recovery of polyamide 6 and polypropylene nanocomposites blended with layered silicate Type de document : texte imprimé Auteurs : G.-G. Lin, Auteur ; Y.-F. Jang Jian, Auteur ; C.-T. Huang, Auteur Année de publication : 2016 Article en page(s) : p. 11-17 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile Composites -- Fluage Essais dynamiques Etat fondu (matériaux) Matériaux hybrides Montmorillonite Polyamide 6 Polypropylène Rhéologie Silicates Index. décimale : 668.4 Plastiques, vinyles Résumé : Nanocomposites of polyamide six (PA6) reinforced with organoclay were prepared in this study through melt mixing. The blended montmorillonite clay was organically modified with octadecylamine. The loadings of the clay were 1 wt%, 5 wt%, and 9 wt%. The obtained nanocomposites exhibited exfoliation (1 wt%) and intercalation (other compositions) structures. By contrast, if they were mixed with unmodified clay, the PA6 molecules could not enter the silicate interlayer. For polypropylene (PP), forming nanocomposites with organoclay was difficult but made feasible by incorporating the maleated PP. The results of dynamic rheological tests demonstrated that an end-tethered storage modulus was observed for the PA6/organoclay nanocomposites. However, the PP/organoclay exhibited terminal-zone behavior. In addition, the shear creep recovery was conducted on the molten polymer composites. The results indicated that the molten PA6/organoclay nanocomposite exhibited a higher creep-recovery ratio, a measure of the elastic property, than that of pristine PA6. The time constant in the Voigt-Kelvin constitutive model for the PA6/organoclay melts was lower than that of the pristine PA6 due to the superior elastic moduli, because it is defined as the ratio of viscosity to the modulus. However, the recovery ratios for most of the PP nanocomposites were found to be less than that for the pristine PP, indicating the fair reinforcing effect of the organoclay. Note de contenu : - EXPERIMENTAL : Materials - Clay modification - Preparing nanocomposites - Structure characterization - Rheological measurement - Constitutive model - RESULTS AND DISCUSSION : X-ray diffraction patterns - Dynamic testing - Creep recovery DOI : 10.3139/217.3041 En ligne : https://drive.google.com/file/d/1Hu1p5PTOyzSpFifWGlANMWkM2kqBy5SO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25761 [article]

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The effects of various variotherm processes and their mechanisms on injection molding / C.-T. Huang in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 3 (07/2011)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 3 (07/2011) . - p. 265-274 Titre : The effects of various variotherm processes and their mechanisms on injection molding Type de document : texte imprimé Auteurs : C.-T. Huang, Auteur ; I.-S. Hsien, Auteur ; C.-H. Tsai, Auteur ; Y.-C. Chiou, Auteur ; C.-C. Tang, Auteur Année de publication : 2011 Article en page(s) : p. 265-274 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection Moules d'injection Tags : Moules  'Rapid  heat  cycle  molding'  RHCM  'Induction  heating  molding  IHM  'Conventional  injection  CIM  'Electricity  mold'  E-mold  'Conservation  énegie' Index. décimale : 668.4 Plastiques, vinyles Résumé : To eliminate surface defects and improve the quality of molded parts, increasing the mold temperature is one of the solutions. Using high mold temperature can eliminate weld lines, reduce molding pressure, residual stress and clamping force and improve part surface quality. However, with the increasing of mold temperature, the cycle time will also be increased. Hence, people have paid the attention to mold temperature control technologies. Among them, the variotherm molding technologies, including Rapid Heat Cycle Molding (RHCM), Induction Heating Molding (IHM), and Electricity Heating Mold (Emold), are some effective methods. Although those variotherm technologies have been proposed, how does the external or internal heating source affect the injection molding process and the final product? The true function and the efficiency study of each technology still remain vague. Hence, in this paper, we have systematically conducted various technologies, including Conventional Injection Molding (CIM), RHCM, IHM, and Emold, by using true 3D transient cool technology. Through the inside mechanism investigation at various moments in time, the functions and the heating-cooling efficiency for each technology can be visualized. Besides, experimental study and verification of IHM are also performed. Note de contenu : - Theory and assumptions - Initial condition for energy conservation - Boundary conditions for energy conservation - Numerical discretization method - Investigation procedures DOI : 10.3139/217.2436 En ligne : https://drive.google.com/file/d/15wEwbQ7pbTp8FfOUsmfrichpp5DZXN_E/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12405 [article]

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