Role of pressure in flow‐induced shish‐kabab in binary blend of long‐ and short‐chain Polyethylenes
Role of pressure in flow‐induced shish‐kabab in binary blend of long‐ and short‐chain Polyethylenes
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长链和短链聚乙烯二元共混物中压力在流动中的作用——诱导烤肉串
DOI：
10.1002/pcr2.10059
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发表时间：
2019-06
影响因子：
1.9
通讯作者：
Zhong‐Ming Li
中科院分区：
文献类型：
--
作者：
Xi‐Xi Zhang;Shu‐Gui Yang;Wen‐Qiang Hua;Jian‐Mei Lin;Jun Lei;Feng‐Gang Bian;Ling Xu;Zhong‐Ming Li
无可否认，长的聚合物链有利于形成流动诱导的串肉串，但到目前为止，压力（一个主要的聚合物加工参数）在流动诱导的串肉串中的作用还没有被触及。在当前的工作中，本体聚乙烯（PE）和98重量% PE和2重量%线性超高分子量聚乙烯（LUHMPE/PE）的共混物被用作模型聚合物。利用加压和剪切装置（PSD），首次揭示了压力和长链对流动诱导串肉串的综合影响。在50 MPa的压力下，在整个施加的剪切速率范围内（0.5 - 28.3 s-1）没有任何shish-kebab痕迹。当压力增加到75 MPa时，PE在28.3 s-1时被流动诱导产生串晶，而LUHMPE/PE共混物在15.7 s-1时出现串晶。毫无疑问，压力显著促进了串肉串的形成，并且当与长链合作时，对流动诱导的串肉串具有协同效应。我们的研究不仅证明了压力条件在流动诱导结晶中的重要性，而且为实际加工提供了更有价值的数据。
Long polymer chains are admittedly beneficial for formation of flow‐induced shish‐kebabs, but up to now, the role of pressure, one major polymer processing parameter, in flow‐induced shish‐kebab is not touched. In the current work, bulk polyethylene (PE) and blend of 98 wt% PE and 2 wt% linear ultra‐high molecular weight polyethylene (LUHMPE/PE) were used as model polymers. Utilizing the pressuring and shearing device (PSD), the combined effect of pressure and long chains on flow‐induced shish‐kebab was revealed for the first time. Under a pressure of 50 MPa, there was no trace of shish‐kebab over the entire range of applied shear rates (0.5‐28.3 s−1). As the pressure increased to 75 MPa, shish‐kebab was induced by flow at 28.3 s−1for PE, while shish‐kebab appeared in LUHMPE/PE blends at 15.7 s−1. Undoubtedly, the pressure significantly facilitated the formation of shish‐kebab and revealed a synergistic effect on flow‐induced shish‐kebab when cooperating with long chains. Our research not only demonstrates the importance of pressure conditions in flow‐induced crystallization, but also provides more valuable data for actual processing.
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