Injection moulding of a commercial B-nucleated polypropylene / J. Varga in INTERNATIONAL POLYMER PROCESSING, Vol. XIV, N° 4 (12/1999)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XIV, N° 4 (12/1999) . - p. 358-364 Titre : Injection moulding of a commercial B-nucleated polypropylene Type de document : texte imprimé Auteurs : J. Varga, Auteur ; A. Breining, Auteur ; G. W. Ehrenstein, Auteur ; G. Bodor, Auteur Année de publication : 1999 Article en page(s) : p. 358-364 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Molding - In a recent paper, the preparation techniques, structural features, crystallization, melting characteristics, and certain properties of the β-modification of isotactic polypropylene (β-IPP) were reviewed. Possible uses of β-IPP were demonstrated through example applications. The problems involved with the processing of β-nucleated polypropylene were analyzed and the conditions of the processing technology of β-IPP end-products were discussed. In the present paper, the results of the studies on the injection moulding technology of a commercial β-nucleated polypropylene are addressed. DOI : 10.3139/217.1545 En ligne : https://drive.google.com/file/d/1huSsIY9bZOxNKRoaG9rbkfkRfFa6RWE_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16125 [article]

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Polymer blends with fibrillar phase morphology prepared by self-reinforcing technique / J. Varga in INTERNATIONAL POLYMER PROCESSING, Vol. XV, N° 1 (03/2000)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XV, N° 1 (03/2000) . - p. 53-62 Titre : Polymer blends with fibrillar phase morphology prepared by self-reinforcing technique : I. Blends of isotactic polypropylene and polyamide-12 Type de document : texte imprimé Auteurs : J. Varga, Auteur ; A. Breining, Auteur ; G. W. Ehrenstein, Auteur Année de publication : 2000 Article en page(s) : p. 53-62 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : High-strength, high-modulus products with a characteristic phase morphology were prepared via the injection molding of blends of isotactic polypropylene (PP) and polyamide-12 (PA-12) under special processing conditions (low melt temperature, high holding pressure, and a convergent sprue design). These conditions generated a situation in which the dispersed phase can be distributed in the self-reinforced matrix as oriented fibrils. Optical (polarized light optical and phase contrast) microscopic and SEM investigations revealed a uniform distribution of the dispersed phase within the matrix. These products can be regarded as in situ thermoplastic composites. The strength level of the self-reinforced blends is approximately twice as high as that of the products processed under conventional conditions. The PA-12 phase dispersed as ultrathin fibrils enhances the flexural impact strength of the blends, decreases their notch sensitivity, and alters its fracture mechanism. Note de contenu : - Characteristics of crystallization and melting of PP/PA-12 blends - Preparation and mechanical characterization of self-reinforced blends - The structure of self-reinforced blends - Comparative experiments with other PP-12 types - Characteristics of the fracture mechanics of self-reinforced blends DOI : 10.3139/217.1580 En ligne : https://drive.google.com/file/d/14Vs607N40yfo5CxAo3GhWiBn40-Q_hhz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16074 [article]

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