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首页> 外文期刊>Journal of Applied Polymer Science >On the nonisothermal melt crystallization kinetics of industrial batch crosslinked polyethylene
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On the nonisothermal melt crystallization kinetics of industrial batch crosslinked polyethylene

机译：论工业批量交联聚乙烯的非等热熔结晶动力学

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摘要

The chemical modification of commodity polymers such as polyethylene (PE) is a versatile synthetic approach for preparing materials that cannot be manufactured cost-effectively using conventional polymerization techniques. Aiming to improve PE character low contents of dicumyl peroxide (DCP), from 0% to 1.5% was added as crosslinker to an industrial batch (PEs mixture and additives). From tensile testing crosslinking provided higher elastic modulus most due to the restrained microstructure where XPEs macromolecular chains are interconnected also providing lower strain at break. Crosslinking effects on the nonisothermal melt crystallization rate (Cmax) and degree of crystallinity (Xc) were evaluated; Cmax increased with the cooling rates, whereas Xc increased upon DCP addition. The melt crystallization kinetics were thoroughly investigated applying Pseudo-Avrami, Ozawa, and Mo models. Ozawa failed to describe the crystallization most due to ignore the secondary crystallization and spherulites impingement at the end of crystallization while Pseudo-Avrami and Mo provided quite good fits. The activation energy was computed using Arrhenius' approach, crosslinked compounds presented higher energy consumption, whereas exception was verified for 0.5XPE which displayed the lowest energy and overall the best mechanical performance this is the most proper compound for industrial applications, such as packaging, and disposables as well as general goods.
机译：聚乙烯（PE）等商品聚合物的化学改性是一种多用途的合成方法，用于制备无法使用传统聚合技术经济高效地制造的材料。为了改善PE特性，在工业批次（PEs混合物和添加剂）中添加0%至1.5%的交联剂，以降低过氧化二异丙苯（DCP）的含量。从拉伸试验来看，交联提供了更高的弹性模量，这主要是因为XPEs大分子链相互连接的受限微观结构也提供了更低的断裂应变。研究了交联对非等温熔融结晶速率（Cmax）和结晶度（Xc）的影响；Cmax随冷却速率增加而增加，而Xc随DCP添加而增加。采用伪Avrami、Ozawa和Mo模型对熔体结晶动力学进行了全面研究。由于忽略了二次结晶和结晶结束时球晶的撞击，Ozawa未能对结晶进行最详细的描述，而伪Avrami和Mo提供了很好的拟合。使用Arrhenius方法计算活化能，交联化合物表现出更高的能耗，而0.5XPE的例外情况得到验证，显示出最低的能量和总体最佳的机械性能。这是最适合工业应用的化合物，如包装、一次性用品和一般商品。

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