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Studies on crystal morphology and crystallization kinetics of polypropylene filled with CaCO 3 of different size and size distribution
Author(s) -
Zhang Jun,
Ding QingJun,
Zhou NingLin,
Li Li,
Ma ZhenMao,
Shen Jian
Publication year - 2006
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.22570
Subject(s) - materials science , crystallinity , crystallization , composite material , differential scanning calorimetry , polypropylene , spherulite (polymer physics) , crystal (programming language) , thermoplastic , scanning electron microscope , kinetics , isothermal process , morphology (biology) , polymer , chemical engineering , physics , computer science , engineering , thermodynamics , programming language , genetics , quantum mechanics , biology
Changes in the crystal morphology, crystallinity, and the melting temperature of thermoplastics resulted in significant changes in the mechanical behavior of composites containing them. For this reason, the research of crystal morphology and crystallization kinetics in thermoplastic composites became an important requirement. The thermoplastic filled with the filler of different size gradation was a new method for improving processability of thermoplastic composites. We have previously reported that the melt viscosity of polypropylene (PP) composites, which were filled with 30 wt % CaCO 3 of effective size gradation, could be evidently declined. In this study, two sizes of CaCO 3 , 325 meshes and 1500 meshes, were blended by different proportions and filled into PP matrix with 30 wt %. Crystal morphology and isothermal crystallization kinetics of a series of composites were characterized by differential scanning calorimeter (DSC) and polarizing microscope. The results showed that composites filled with CaCO 3 of effective size gradation leaded to a well‐crystalline order and a large crystal size, while their isothermal crystallization kinetics and crystallization rate constant ( k ) were declined, and their Avrami exponents ( n ) and crystallization half‐life ( t 1/2 ) were increased compared with the composites filled with single size CaCO 3 . © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 2437–2444, 2006