Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2011-02-01

Journal: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY

Included Journals: EI、SCIE

Volume: 103

Issue: 2

Page Number: 701-710

ISSN: 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.