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Crystallization and melting behavior of nano‐CaCO 3 /polypropylene composites modified by acrylic acid

2003; Wiley; Volume: 91; Issue: 4 Linguagem: Inglês

10.1002/app.13405

1097-4628

Zhidan Lin, Zhenzhen Huang, Yu Zhang, Kancheng Mai, Hanmin Zeng,

biodegradable polymer synthesis and properties

Abstract Nano‐CaCO 3 /polypropylene (PP) composites modified with polypropylene grafted with acrylic acid (PP‐ g ‐AA) or acrylic acid with and without dicumyl peroxide (DCP) were prepared by a twin‐screw extruder. The crystallization and melting behavior of PP in the composites were investigated by DSC. The experimental results showed that the crystallization temperature of PP in the composites increased with increasing nano‐CaCO 3 content. Addition of PP‐ g ‐AA further increased the crystallization temperatures of PP in the composites. It is suggested that PP‐ g ‐AA could improve the nucleation effect of nano‐CaCO 3 . However, the improvement in the nucleation effect of nano‐CaCO 3 would be saturated when the PP‐ g ‐AA content of 5 phf (parts per hundred based on weight of filler) was used. The increase in the crystallization temperature of PP was observed by adding AA into the composites and the crystallization temperature of the composites increased with increasing AA content. It is suggested that the AA reacted with nano‐CaCO 3 and the formation of Ca(AA) 2 promoted the nucleation of PP. In the presence of DCP, the increment of the AA content had no significant influence on the crystallization temperature of PP in the composites. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 2443–2453, 2004