Effects of process conditions on the dissolution of carbon dioxide in PS in foaming extruders / Q. Zhang in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 3 (09/2001)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVI, N° 3 (09/2001) . - p. 223-228 Titre : Effects of process conditions on the dissolution of carbon dioxide in PS in foaming extruders Type de document : texte imprimé Auteurs : Q. Zhang, Auteur ; M. Xanthos, Auteur ; S. K. Dey, Auteur Année de publication : 2001 Article en page(s) : p. 223-228 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The effects of the main processing conditions on the dissolution behaviour of CO2 in polystyrene melt were studied using a novel in-line method in connection with both single and twin-screw foaming extruders. Apparent solubility data obtained from the twin-screw extrusion experiments showed better consistency compared with those obtained from single screw experiments, indicating the importance of enhanced mixing in affecting the gas dissolution and solubility behaviour during an extrusion foaming process. Gas dissolution inside a twin-screw foaming extruder was further studied for CO2 in the polystyrene melt. the measured gas up-take was compared with the values calculated assuming equilibrium conditions in the gas injection zone in an effort to elucidate possible mechanisms for gas dissolution inside a foaming extruder during the actual foaming process. Note de contenu : - Solubility of CO2 in polystyrene melt - Effects of processing conditions - Gas dissolution mechanisms inside a foaming extruder DOI : 10.3139/217.1648 En ligne : https://drive.google.com/file/d/14RrCzRQ6uKCPO44bZHM0LVp7o6JP19jH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15902 [article]

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Improved layer mechanical properties of micro injection molded PP / S. J. Ma in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 1 (03/2017)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 1 (03/2017) . - p. 138-142 Titre : Improved layer mechanical properties of micro injection molded PP Type de document : texte imprimé Auteurs : S. J. Ma, Auteur ; Shi Wei Wang, Auteur ; Q. Zhang, Auteur ; Q. Li, Auteur Année de publication : 2017 Article en page(s) : p. 138-142 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Engrenages Matières plastiques -- Moulage par micro-injection Matières plastiques -- Propriétés mécaniques Pièces moulées Polymères isotactiques Polypropylène Index. décimale : 668.4 Plastiques, vinyles Résumé : The results have been achieved by adjusting the structure to improve the performance of micro injection molded isotactic polypropylene products. Annealing was adopted to optimize the performance of isotactic polypropylene micro injection molded gears. It was found that the annealing temperature shows greater influence on the crystalline structure of the micro injection molded gears than annealing time. The layer mechanical properties were greatly improved after annealing, about 1.7-fold for modulus and 1.9-fold for hardness of the micro injection molded gears relative to the unannealed sample. This is due to the fact the state of molecular chain aggregation tends to be consistent after high temperature annealing in the micro injection molded isotactic polypropylene gear sample. DOI : 10.3139/217.3349 En ligne : https://drive.google.com/file/d/1LTsymFbJt4nfndAts60EbBs7fbxpwPyp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28010 [article]

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