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The effect of chitin nanocrystal on the structural transition of shish-kebab to fibrillar crystals of ultra-high molecular weight polyethylene/chitin nanocrystal fibers during hot-stretching process
European Polymer Journal ( IF 6 ) Pub Date : 2017-11-01 , DOI: 10.1016/j.eurpolymj.2017.08.027
Minfang An , Haojun Xu , You Lv , Feng Tian , Qun Gu , Zongbao Wang

Abstract The pre-stretched ultra-high molecular weight polyethylene/chitin nanocrystal composite fibers after first hot-stretching stage were prepared. The effect of chitin nanocrystal on the structural evolution of shish-kebab to fibrillar crystals of ultra-high molecular weight polyethylene/chitin nanocrystal fibers during hot-stretching process was studied by using in-situ small-angle X-ray scattering, wide-angle X-ray diffraction measurements, and scanning electron microscopy. The results showed that the addition of chitin nanocrystal can improve the stretchability of pre-stretched fibers, and makes the elongation of amorphous layers between lamellae more uniform. The chitin nanocrystal accelerates the fragmentation recrystallization process of kebab crystals (lamellae) at 90, 100, and 110 °C and the melting recrystallization at 120 °C during hot-stretching process. Moreover, more fibrillar crystals form in UHMWPE/CNC fibers comparing with pure UHMWPE fibers at the same strain and stretching temperatures. These results suggest that the addition of chitin nanocrystal is conducive to the structural evolution of shish-kebab to fibrillar crystals of ultra-high molecular weight polyethylene fibers during hot-stretching process.

中文翻译:

几丁质纳米晶对热拉伸过程中烤羊肉串向超高分子量聚乙烯/几丁质纳米晶纤维原纤状晶体结构转变的影响

摘要 制备了经过第一道热拉伸的预拉伸超高分子量聚乙烯/甲壳素纳米晶复合纤维。利用原位小角X射线散射、广角X射线衍射研究了几丁质纳米晶对热拉伸过程中烤羊肉串向超高分子量聚乙烯/几丁质纳米晶纤维的原纤晶体结构演变的影响。 X 射线衍射测量和扫描电子显微镜。结果表明,甲壳素纳米晶的加入可以提高预拉伸纤维的拉伸性,使片层间非晶层的拉伸更加均匀。几丁质纳米晶体加速烤肉串晶体(薄片)在 90、100、和 110 °C 以及在热拉伸过程中在 120 °C 下熔融再结晶。此外,在相同的应变和拉伸温度下,与纯 UHMWPE 纤维相比,UHMWPE/CNC 纤维中会形成更多的原纤维晶体。这些结果表明,甲壳素纳米晶的加入有利于烤肉串在热拉伸过程中向超高分子量聚乙烯纤维的原纤晶体的结构演变。
更新日期:2017-11-01
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