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Crystallization and melt behavior of magnesium hydroxide/polypropylene composites modified by functionalized polypropylene
Author(s) -
Lin Zhidan,
Qiu Yixin,
Mai Kanchen
Publication year - 2004
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.13595
Subject(s) - crystallization , nucleation , polypropylene , materials science , melting point , polymer chemistry , chemical engineering , composite material , chemistry , organic chemistry , engineering
The crystallization and melting behavior of Mg(OH) 2 /polypropylene (PP) composites modified by the addition of functionalized polypropylene (FPP) or acrylic acid (AA) and the formation of in situ FPP were investigated by DSC. The results indicated that addition of FPP increased crystallization temperatures of PP attributed to the nucleation effect of FPP. The formation of in situ FPP resulted in a reduced crystallization rate, melting point, and degree of crystallization because of the decreased regularity of the PP chain. For the Mg(OH) 2 /PP composites, addition of Mg(OH) 2 increased the crystallization temperatures of PP attributed to a heterogeneous nucleation effect of Mg(OH) 2 . Addition of FPP into Mg(OH) 2 /PP composites further enhanced the crystallization temperatures of PP. It is suggested that there is an activation of FPP to the heterogeneous nucleation effect of Mg(OH) 2 surface. The addition of AA also increased the crystallization temperatures of PP in Mg(OH) 2 /PP composites, but crystallization temperatures of PP were not influenced by the AA content, a phenomenon explained by the heterogeneous nucleation effect of the Mg(OH) 2 surface activated by FPP and AA. A synergistic effect on crystallization of PP in Mg(OH) 2 /PP composites further increased the crystallization temperatures of PP. However, the crystallization temperatures of Mg(OH) 2 /PP composites modified by in situ FPP were lower than those of Mg(OH) 2 /PP composites modified by the addition of FPP or AA. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 91:3899–3908, 2004