Isothermal crystallization of iPP in model glass‐fiber composites

Janevski, Aco and Bogoeva-Gaceva, Gordana (1998) Isothermal crystallization of iPP in model glass‐fiber composites. Journal of Applied Polymer Science, 69 (2). pp. 381-389.

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Abstract

: Isothermal crystallization of iPP in model glass-fiber composites is studied by DSC, and the basic energetic parameters of crystallization are determined. Unsized untreated and thermally treated glass fibers are used in model composites to determine the role of the surface on nucleation and crystallization processes. Thermally treated glass fibers are found to exhibit a predominant nucleating effect as compared to unsized untreated ones, and the crystallization proceeds faster, resulting in lower values for the half-time of crystallization (10–120 s). The energy of formation of a nuclei of critical dimensions at a given Tc is also lower, and it decreases as the content of the fibers in the composite increases. The surface free energy of folding, σe = 140 × 10−3 J/m2, was determined for iPP in the composite containing 50% glass fibers, while for pure iPP, σe = 170 × 10−3J/m2 was found.

Item Type: Article
Subjects: Engineering and Technology > Materials engineering
Engineering and Technology > Other engineering and technologies
Divisions: Faculty of Technology
Depositing User: Aco Janevski
Date Deposited: 26 Mar 2013 13:44
Last Modified: 26 Mar 2013 13:44
URI: http://eprints.ugd.edu.mk/id/eprint/6029

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