The effect of reserved shish content on the structural evolution of high-entanglement ultrahigh molecular weight polyethylene films during the hot stretching process

IF 4.1 2区化学 Q2 POLYMER SCIENCE Polymer Pub Date : 2024-08-23 DOI:10.1016/j.polymer.2024.127534

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Abstract

To explore novel approaches facilitating the structural evolution of high-entanglement ultrahigh molecular weight polyethylene (UHMWPE) films, this study precisely controlled the temperature during compression molding to successfully prepare high-entanglement UHMWPE films with different shish contents. Using in-situ small-angle X-ray scattering (SAXS)/ultra-small-angle X-ray scattering (USAXS)/wide-angle X-ray diffraction (WAXD) alongside ex-situ scanning electron microscopy (SEM) and differential scanning calorimetry (DSC), we investigated the influence of shish contents on the structural evolution of high-entanglement UHMWPE films during hot stretching. The results indicate that increasing shish content in high-entanglement UHMWPE films reduces the accumulation of inclined lamellar crystals caused by high entanglement, promoting the transformation of inclined lamellar crystals into shish-kebab crystals and facilitating the formation of more shish-kebab crystals. In high-entanglement UHMWPE films with high shish content, eventually, all inclined lamellar crystals even transform into shish-kebab crystals.

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在热拉伸过程中，预留菱形含量对高延伸超高分子量聚乙烯薄膜结构演变的影响

为了探索促进高张力超高分子量聚乙烯（UHMWPE）薄膜结构演变的新方法，本研究精确控制了压缩成型过程中的温度，成功制备了不同shish含量的高张力超高分子量聚乙烯薄膜。我们利用原位小角 X 射线散射（SAXS）/超小角 X 射线散射（USAXS）/广角 X 射线衍射（WAXD）以及原位扫描电子显微镜（SEM）和差示扫描量热仪（DSC），研究了热拉伸过程中 "菱形 "含量对高拉伸 UHMWPE 薄膜结构演变的影响。结果表明，增加高缠结超高分子量聚乙烯薄膜中的菱形晶含量可减少高缠结引起的倾斜片晶的积累，促进倾斜片晶向菱形-kebab 晶体的转化，并有利于形成更多的菱形-kebab 晶体。在什含量较高的高缠结超高分子量聚乙烯薄膜中，最终所有的倾斜片晶甚至都会转变为什-kebab 晶体。

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来源期刊

Polymer 化学-高分子科学

CiteScore

7.90

自引率

8.70%

发文量

959

审稿时长

32 days

期刊介绍： Polymer is an interdisciplinary journal dedicated to publishing innovative and significant advances in Polymer Physics, Chemistry and Technology. We welcome submissions on polymer hybrids, nanocomposites, characterisation and self-assembly. Polymer also publishes work on the technological application of polymers in energy and optoelectronics. The main scope is covered but not limited to the following core areas: Polymer Materials Nanocomposites and hybrid nanomaterials Polymer blends, films, fibres, networks and porous materials Physical Characterization Characterisation, modelling and simulation* of molecular and materials properties in bulk, solution, and thin films Polymer Engineering Advanced multiscale processing methods Polymer Synthesis, Modification and Self-assembly Including designer polymer architectures, mechanisms and kinetics, and supramolecular polymerization Technological Applications Polymers for energy generation and storage Polymer membranes for separation technology Polymers for opto- and microelectronics.

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