| 曹田,任琳,王平.超高分子量聚乙烯（UHMWPE）冻胶丝在拉伸初级阶段的结构演变[J].安徽建筑大学学报,2021,29(6):35-41 |
| 超高分子量聚乙烯（UHMWPE）冻胶丝在拉伸初级阶段的结构演变 |
| Structural Evolution of Ultra-High Molecular Weight Polyethylene（UHMWPE）Gel Yarn in the Primary Stage ofStreching |
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| DOI： |
| 中文关键词: 超高分子量聚乙烯 纤维 拉伸 塑性形变 |
| 英文关键词: UHMWPE fiber stretching plastic deformation |
| 基金项目:安徽建筑大学博士启动基金项目（2018QD59，2019QDZ22）；安徽省高校科研基金项目（KJ2019JD18） |
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| 中文摘要: |
| 聚乙烯在白油中溶胀后形成半稀液，经双螺杆挤出机、纺丝箱等，通过凝胶纺丝技术获得冻胶丝，再经连续拉伸得到 UHMWPE 纤维。采用扫描电子显微镜（SEM）、小角和宽角 X 射线散射（SAXS 、WAXS）测试分析，建立了纤维在拉伸初级阶段结构演变过程的模型。结果表明，在 110 ℃（接近熔点的温度）连续拉伸，片晶向纤维晶转变的过程首先是拉伸诱导结晶的过程。随着拉伸持续，晶体被破坏，分子链被不断拉出晶体块并充分展开，最终形成伸直链纤维。 |
| 英文摘要: |
| UHMWPE fibers are obtained by continuous stretching of gel yarn via gel spinning，which formed by polyethylene swollenin white oil and passed through a twin-screw extruder and a spinning box. Scanning electron microscopy （SEM），small-angle andwide-angle X-ray scattering （SAXS ，WAXS） test analysis were used to model the structural evolution process of fibers in theprimary stage of stretching. The results show that the transformation of lamellar crystal to fibrous crystal by continuous stretching at110℃ （a temperature close to the melting point） is firstly a process of stretching-induced crystallization. As the stretching continues，the crystals are disrupted and the molecular chains are pulled out of the crystal blocks and fully expanded，eventually forming extendedchain fibers. |
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