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首页> 外文期刊>Journal of Applied Polymer Science >Effect of UV-photocrosslinking on the nonisothermal crystallization kinetics of polyethylene
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Effect of UV-photocrosslinking on the nonisothermal crystallization kinetics of polyethylene

机译：紫外光交联对聚乙烯非等温结晶动力学的影响

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摘要

The influences of UV-photocrosslinking on crystallite structure and nonisothermal crystallization kinetics of polyethylene (PE) were investigated by optical microscope (OM) and differential scanning calorimetry (DSC) at different cooling rates, respectively. The observation of crystallite structure showed that, due to crosslinking of molecular chains of PE, the PE spherulites grow more imperfectly with increasing gel content. The Avrami analysis modified by Jeziorny was applied to describe the nonisothermal crystallization process of virgin PE and photocrosslinked PE (XLPE) samples. The values of half-time of crystallization t(1/2) and the parameter Z(c) showed that the crystallization rate increased with increasing cooling rates for both XLPE and virgin PE, but the crystallization rate of XLPE is lower than that of virgin PE at the same cooling rate. The activation energies were estimated by the Kissinger method, and the values were 176.7 and 197.1 kJ/mol for virgin PE and XLPE, respectively, indicating that UV-photocrosslinking might hinder the overall nonisothermal crystallization process of PE. (C) 2007 Wiley Periodicals, Inc.
机译：分别通过光学显微镜（OM）和差示扫描量热法（DSC）研究了不同冷却速率下紫外光交联对聚乙烯（PE）微晶结构和非等温结晶动力学的影响。晶体结构的观察表明，由于PE分子链的交联，随着球状凝胶含量的增加，PE球晶的生长更加不完美。由Jeziorny修改的Avrami分析用于描述原始PE和光交联PE（XLPE）样品的非等温结晶过程。半结晶时间t（1/2）和参数Z（c）的值表明，XLPE和纯PE的结晶速率均随冷却速率的增加而增加，但XLPE的结晶速率低于纯PE的结晶速率。 PE在相同的冷却速率下。活化能通过基辛格方法估算，原始PE和XLPE的活化能分别为176.7和197.1 kJ / mol，表明UV-光交联可能会阻碍PE的整体非等温结晶过程。 （C）2007 Wiley期刊公司

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