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首页> 外文期刊>Journal of thermal analysis and calorimetry >Crystallization and melting behavior of isotactic polypropylene nucleated with individual and compound nucleating agents
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Crystallization and melting behavior of isotactic polypropylene nucleated with individual and compound nucleating agents

机译：用单独成核剂和复合成核剂成核的等规聚丙烯的结晶和熔融行为

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摘要

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.
机译：在这项研究中，将α相成核剂（NA）1,3：2,4-双（3,4-二甲基亚苄基）山梨醇（DMDBS），β相稀土NA（WBG）及其化合物NAs引入等规聚丙烯（iPP）基质。通过差示扫描量热法（DSC）在等温和非等温条件下，对成核iPP的结晶动力学和随后的熔融行为进行了比较研究。对于等温结晶过程，发现Avrami模型成功描述了结晶动力学。 iPP的非等温结晶活性能量通过Kissinger方法确定，结果表明成核剂的加入增加了活化能。有核iPP的熔化行为和晶体结构取决于NA的性质和结晶条件。 β-成核剂的含量越高，结晶温度或冷却速度越低，则β相的比例越高。

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