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Indexed by:期刊论文

Date of Publication:2011-02-01

Journal:JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY

Included Journals:SCIE、EI

Volume:103

Issue:2

Page Number:701-710

ISSN No.:1388-6150

Key Words:Crystallization; Isotactic polypropylene; Magnesium salt whisker; Melting behavior

Abstract:Crystallization behavior of isotactic polypropylene (iPP)/magnesium salt whisker (MSW) composites modified by compatibilizer PP-g-MAH was studied under both isothermal and nonisothermal conditions. Analysis of the isothermal crystallization showed that the Avrami model successfully described the crystallization process. On the basis of Lauritzen-Hoffman theory, a regime transition was observed at about 139 A degrees C for the iPP/MSW composite, and a decrease in the fold surface free energy was calculated with the addition of MSW and PP-g-MAH. The addition of MSW filler and PP-g-MAH compatibilizer distinctly improved the crystallization temperature and accelerated the total crystallization rate of iPP. It was observed that MSW induced the formation of beta-iPP but PP-g-MAH suppressed the formation of beta-iPP.