Competition between a and b crystallization in isotactic polypropylene : effect of nucleating agents composition / S.-W. Wang in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 3 (07/2015)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 3 (07/2015) . - p. 344-349 Titre : Competition between a and b crystallization in isotactic polypropylene : effect of nucleating agents composition Type de document : texte imprimé Auteurs : S.-W. Wang, Auteur ; Y. T. Leng, Auteur ; J. Jiang, Auteur ; G.-Q. Zheng, Auteur ; Q. Li, Auteur Année de publication : 2015 Article en page(s) : p. 344-349 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cristallisation Nucléation Polymères -- Propriétés mécaniques Polymères isotactiques Polypropylène Rhéologie Index. décimale : 668.9 Polymères Résumé : Based on the different nucleation ability, different contents and proportions of the mixed nucleating agents were melt compounded with pure isotactic polypropylene resins employed in this work, selective ? nucleating agent was a compound of pimelic acid and calcium stearate, the ? nucleating agent was a type of dibenzylidene sorbitol derivative. The competition attributed to the different type of interactions between a nucleating agent and isotactic polypropylene molecular chains during crystallization was investigated in this research. For a low content of the mixed nucleating agents used, ? nucleation dominated the crystallization behavior of isotactic polypropylene, while with an increase of the content of the mixed nucleating agents, the situation was reversed and ? nucleation became dominant. In the ? dominated region, both of the molecular chain and segmental motions were various with different nucleating agent proportion. Thus, the content and proportion of the components of the nucleating agents were the critical factors in the competition during crystallization. Note de contenu : - Material - Sample preparation - Mechanical properties - Differential scanning calorimetry - Wide angle X-ray diffraction - Dynamic rheological analysis DOI : 10.3139/217.3023 En ligne : https://drive.google.com/file/d/1vFky-tZGOnQ3fR-OKDD9ObcWFnGhsGc3/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24329 [article]

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