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.

中文翻译：

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保留网格含量对高缠结超高分子量聚乙烯薄膜热拉伸过程中结构演变的影响


为了探索促进高缠结超高分子量聚乙烯（UHMWPE）薄膜结构演变的新方法，本研究精确控制压缩成型过程中的温度，成功制备了不同纤维含量的高缠结UHMWPE薄膜。使用原位小角 X 射线散射 (SAXS)/超小角 X 射线散射 (USAXS)/广角 X 射线衍射 (WAXD) 以及异位扫描电子显微镜 (SEM) 和微分通过扫描量热法 (DSC)，我们研究了网格含量对热拉伸过程中高缠结 UHMWPE 薄膜结构演变的影响。结果表明，增加高缠结UHMWPE薄膜中的网格含量，减少了高缠结引起的倾斜层状晶体的积累，促进倾斜层状晶体向网格状晶体的转变，有利于更多网格状晶体的形成。在具有高蛋白含量的高缠结UHMWPE薄膜中，最终所有倾斜层状晶体甚至转变成蛋白串晶体。