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Nonisothermal crystallization kinetics of AB 2 hyperbranched polymer‐filled polypropylene
Author(s) -
Liu Guangtian,
Lei Jing,
Wang Fengyan
Publication year - 2013
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.23514
Subject(s) - nucleation , materials science , polypropylene , crystallization , differential scanning calorimetry , crystallite , avrami equation , kinetics , polymer , crystallization of polymers , polymer chemistry , chemical engineering , composite material , thermodynamics , metallurgy , physics , quantum mechanics , engineering
In this article, nonisothermal crystallization kinetics of polypropylene (PP) and AB 2 hyperbranched polymer (HBP)‐filled PP have been investigated by differential scanning calorimetry. The Avrami analysis modified by Mandelkern and a method combined with Avrami and Ozawa equations were employed to describe successfully the nonisothermal crystallization kinetics of samples. The conclusion showed that HBP can prompt crystallization effectively. Furthermore, in blends of different HBP contents, the value of t 1/2 became smaller with increasing HBP content; however, the crystallization rate of the blend decreased slightly when content of HBP is 5%. An increase in the Avrami exponent showed that addition of HBP influenced the mechanism of nucleation and the growth of PP crystallites. The possible explanation could be attributed to the fractal structure of HBP. The polarized micrographs showed that HBP acts as a heterogeneous nucleation agent, and the nucleation efficiency has increased remarkably in HBP/PP blends. POLYM. ENG. SCI., 53:2535–2540, 2013. © 2013 Society of Plastics Engineers