Crystallization and melting behavior of isotactic polypropylene nucleated with individual and compound nucleating agents |
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Authors: | Zhiyong Wei Wanxi Zhang Guangyi Chen Jicai Liang Shu Yang Pei Wang Lian Liu |
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Institution: | (1) School of Automotive Engineering, Dalian University of Technology, 116024 Dalian, China;(2) School of Transportation and Logistics Engineering, Dalian Maritime University, 116026 Dalian, China |
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Abstract: | In this study, α-phase nucleating agent (NA) 1,3:2,4-bis(3,4-dimethylbenzylidene) sorbitol (DMDBS), β-phase rare earth NA
(WBG), and their compound NAs were introduced into isotactic polypropylene (iPP) matrix, respectively. Crystallization kinetics
and subsequent melting behavior of the nucleated iPPs were comparatively studied by differential scanning calorimetry (DSC)
under both isothermal and nonisothermal conditions. For the isothermal crystallization process, it is found that the Avrami
model successfully described the crystallization kinetics. The active energy of nonisothermal crystallization of iPP was determined
by the Kissinger method and showed that the addition of nucleating agents increased the activation energy. Melting behavior
and crystalline structure of the nucleated iPPs are dependent on the nature of NAs and crystallization conditions. Higher
proportion of β-phase can be obtained at higher content of β-nucleating agent and lower crystallization temperature or lower
cooling rate. |
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Keywords: | |
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