Improving the strength of polyethylene solids by simple controlling of the molecular weight distribution
Improving the strength of polyethylene solids by simple controlling of the molecular weight distribution
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DOI：
10.1016/j.polymer.2021.123526
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发表时间：
2021-02-17
期刊：
影响因子：
4.6
通讯作者：
Shiono, Takeshi
中科院分区：
文献类型：
--
作者：
Kida, Takumitsu;Tanaka, Ryo;Shiono, Takeshi
我们制备了模型聚乙烯（PE）样品，其中包含的控制量的高分子量组分通过共混到一个多分散的PE单分散的PE，阐明的影响的高分子量组分的聚合物的机械性能。通过添加足够高分子量的单分散PE，强度和应变硬化模量显著增强，并且确定Mw的临界值类似于3.0 × 10（5）。改进的强度和应变硬化模量归因于桥接相邻层状簇单元的簇间链接的较高量，因为这些链接充当这些单元之间的应力传递器。
We prepared model polyethylene (PE) samples that contain the controlled-amounts of the high-molecular-weight component by blending a monodispersed PE into a polydispersed PE, to elucidate the influence of the high molecular-weight component of a polymer on its mechanical properties. The strength and strain-hardening modulus were significantly enhanced by the addition of a monodispersed PE of sufficiently high molecular weight, and the critical value of Mw was determined to be similar to 3.0 x 10(5). The improved strength and strain hardening modulus are attributed to higher amounts of inter-cluster links that bridge adjacent lamellar cluster units because these links act as stress transmitters between these units.