Effects of different ultrahigh molecular weight polyethylene contents on the formation and evolution of hierarchical crystal structure of high‐density polyethylene/ultrahigh molecular weight polyethylene blend fibers,Journal of Polymer Science

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Effects of different ultrahigh molecular weight polyethylene contents on the formation and evolution of hierarchical crystal structure of high‐density polyethylene/ultrahigh molecular weight polyethylene blend fibers
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2020-07-26 , DOI: 10.1002/pol.20200205
Zaixing Yang ₁ , Jiaji Shi ₁ , Xuefeng Pan ₁ , Boping Liu ₂ , Xuelian He ₁

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In this paper, the blend fibers of ultrahigh molecular weight polyethylene (UHMWPE) and high‐density polyethylene (HDPE) were prepared by solution blending and gel spinning process. The uniformity of the blend fibers has been confirmed by rheological data and thermodynamic unimodal curve. They were further characterized by single fiber strength test, scanning electron microscopy, wide‐angle X‐ray diffraction, small‐angle X‐ray scattering, and so forth, to explore the structural evolution mechanism with the change of UHMWPE content. The results showed that when the molar content of UHMWPE was only 2.9 mol%, entanglement appeared in the structure of shish‐kebab, and when the proportion reached 20 mol%, an interlocking structure could be observed. With the increase of UHMWPE content, kebab began to be networked, and when the content reached 33 mol%, kebab's orientation reached its peak. After that, the interlocking network structure gradually improved. When the content reached 50 mol%, the shish's orientation reached saturation, and the shish‐kebab network became perfect. In addition, with the increase of UHMWPE content, stress‐induced recrystallization occurred on the wafer, some kebab would be converted into shish crystals, and when the content exceeded 50 mol%, the microfibers began to merge, and the wafer became denser, but still had entanglements. Our work has proposed a quantitative explanation for the evolution of hierarchical crystal structure of HDPE/UHMWPE blend fibers.

中文翻译：

不同超高分子量聚乙烯含量对高密度聚乙烯/超高分子量聚乙烯共混纤维分层晶体结构形成和演化的影响

通过溶液共混和凝胶纺丝工艺制备了超高分子量聚乙烯（UHMWPE）和高密度聚乙烯（HDPE）的混纺纤维。共混纤维的均匀性已通过流变数据和热力学单峰曲线得到证实。通过单纤维强度测试，扫描电子显微镜，广角X射线衍射，小角X射线散射等对它们进行了进一步表征，以探索随UHMWPE含量变化的结构演变机理。结果表明，当UHMWPE的摩尔含量仅为2.9 mol％时，烤肉串结构中出现纠缠，当比例达到20 mol％时，可以观察到连锁结构。随着UHMWPE含量的增加，烤肉串开始联网，当含量达到33 mol％时，烤肉串的定位达到了顶峰。此后，联锁网络结构逐步完善。当含量达到50 mol％时，烤肉串的取向达到饱和，烤肉串网络变得完美。此外，随着UHMWPE含量的增加，晶片上发生了应力诱导的重结晶，一些烤肉串会转变成浅结晶，当含量超过50 mol％时，微纤维开始融合，晶片变得更致密，但是仍然有纠缠。我们的工作为HDPE / UHMWPE共混纤维的分级晶体结构的演化提出了定量解释。烤肉串网络变得完美。此外，随着UHMWPE含量的增加，晶片上发生了应力诱导的重结晶，一些烤肉串会转变成浅结晶，当含量超过50 mol％时，微纤维开始融合，晶片变得更致密，但是仍然有纠缠。我们的工作为HDPE / UHMWPE共混纤维的分级晶体结构的演化提出了定量解释。烤肉串网络变得完美。此外，随着UHMWPE含量的增加，晶片上发生了应力诱导的重结晶，一些烤肉串会转变成浅结晶，当含量超过50 mol％时，微纤维开始融合，晶片变得更致密，但是仍然有纠缠。我们的工作为HDPE / UHMWPE共混纤维的分级晶体结构的演化提出了定量解释。

更新日期：2020-07-26

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