Structural Evolution of Ultra-High Molecular Weight Polyethylene Low-Entangled Films with Reserved Shish Crystals During Hot Stretching

IF 4.1 2区化学 Q2 POLYMER SCIENCE

Chinese Journal of Polymer Science Pub Date : 2024-05-10 DOI:10.1007/s10118-024-3143-3

Jia-Wei Gao, Li Chen, Ye-Shun Zhong, Chao-Wei Xing, Yi-Guo Li, Zong-Bao Wang

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引用次数: 0

Abstract

Shish crystals are crucial to achieving high performance low-dimensional ultra-high molecular weight polyethylene (UHMWPE) products. Typically, high stretch and shear flow fields are necessary for the formation of shish crystals. In this study, UHMWPE gel films with reserved shish crystals were prepared by gel molding, the structural evolution and properties of UHMWPE films stretched at temperatures of 100, 110, 120 and 130 °C were investigated by in situ small-angle X-ray scattering (SAXS)/ultra-small-angle X-ray scattering (USAXS)/wide-angle X-ray diffraction (WAXD) measurements as well as scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) measurements. Our findings showed that the reserved shish crystals can facilitate the formation and structural evolution of shish-kebab crystals during the hot stretching. Additionally, the reserved shish crystals promote the structural evolution of UHMWPE films to a greater extent when stretched at 120 and 130 °C, compared to 100 and 110 °C, resulting in higher crystallinity, orientation, thermal properties, breaking strength and Young’s modulus. Compared to UHMWPE high-entangled films with reserved shish crystals prepared by compression molding, UHMWPE low-entangled films with reserved shish crystals prepared by gel molding are more effective in inducing the formation and evolution of shish-kebab crystals during the hot stretching, resulting in increased breaking strength and Young’s modulus.

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超高分子量聚乙烯低缠结薄膜在热拉伸过程中保留的 Shish 晶体的结构演变

菱形结晶是实现高性能低维超高分子量聚乙烯 (UHMWPE) 产品的关键。通常情况下，高拉伸和高剪切流场是形成菱形晶体的必要条件。本研究通过凝胶模塑法制备了具有预留菱形晶体的超高分子量聚乙烯凝胶薄膜，并通过原位小角 X 射线散射（SAXS）/超小角 X 射线散射（USAXS）/广角 X 射线衍射（WAXD）测量以及扫描电子显微镜（SEM）和差示扫描量热仪（DSC）测量，研究了在 100、110、120 和 130 °C 温度下拉伸的超高分子量聚乙烯薄膜的结构演变和性能。我们的研究结果表明，在热拉伸过程中，保留的蘑菇石晶体可以促进蘑菇石-kebab 晶体的形成和结构演变。此外，与 100 和 110 ℃ 相比，在 120 和 130 ℃ 下拉伸时，保留的菱形晶体能在更大程度上促进超高分子量聚乙烯薄膜的结构演变，从而获得更高的结晶度、取向性、热性能、断裂强度和杨氏模量。与通过压缩成型制备的带有预留什晶的超高分子量聚乙烯高缠结薄膜相比，通过凝胶成型制备的带有预留什晶的超高分子量聚乙烯低缠结薄膜能更有效地诱导热拉伸过程中什晶的形成和演化，从而提高断裂强度和杨氏模量。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chinese Journal of Polymer Science 化学-高分子科学

CiteScore

7.10

自引率

11.60%

发文量

218

审稿时长

6.0 months

期刊介绍： Chinese Journal of Polymer Science (CJPS) is a monthly journal published in English and sponsored by the Chinese Chemical Society and the Institute of Chemistry, Chinese Academy of Sciences. CJPS is edited by a distinguished Editorial Board headed by Professor Qi-Feng Zhou and supported by an International Advisory Board in which many famous active polymer scientists all over the world are included. The journal was first published in 1983 under the title Polymer Communications and has the current name since 1985. CJPS is a peer-reviewed journal dedicated to the timely publication of original research ideas and results in the field of polymer science. The issues may carry regular papers, rapid communications and notes as well as feature articles. As a leading polymer journal in China published in English, CJPS reflects the new achievements obtained in various laboratories of China, CJPS also includes papers submitted by scientists of different countries and regions outside of China, reflecting the international nature of the journal.