UHMWPE冻胶纺丝中的降解行为及其对纤维性能的影响  

Degradation behavior and its effect on properties of UHMWPE fiber during gel spinning process

作　　者：马林[1,2] 王新威[2,3] 于俊荣[1] 王彦[1] 胡祖明[1] 诸静[1] 

机构地区：[1]东华大学纤维材料改性国家重点实验室,上海201620 [2]上海化工研究院聚烯烃催化技术与高性能材料国家重点实验室,上海200031 [3]上海化工研究院聚烯烃催化技术重点实验室,上海200031

出　　处：《合成纤维工业》2017年第4期5-10,共6页China Synthetic Fiber Industry

基　　金：上海市自然科学基金(15ZR1401100);上海市聚烯烃催化技术重点实验室开放课题(LCTP-201502)

摘　　要：采用双螺杆混炼挤出机溶胀、溶解和挤出纺丝技术制备超高相对分子质量聚乙烯(UHMWPE)冻胶纤维,经热管拉伸得到UHMWPE纤维,研究了冻胶纺丝工艺及后续热拉伸对UHMWPE纤维黏均相对分子质量(M_η)的影响,以及M_η与UHMWPE成品纤维力学性能、热性能、抗蠕变性能及耐磨性能的关系。结果表明:螺杆转速、溶解温度及溶液浓度变化引起的物料高温停留时间和受剪切强度变化对UHMWPE分子降解程度有很大的影响,超倍热拉伸工艺对UHMWPE分子降解影响不大;在UHMWPE溶解均匀的情况下,纤维强度、抗蠕变及耐磨性能随冻胶纤维M_η的增大而增大,且纤维结晶度增加,熔点升高;而UHMWPE溶解条件不佳时,冻胶纤维M_η最高,但纤维表面呈现不均匀凸起,纤维综合性能也变差。Ultrahigh-relative molecular mass polyethylene （UHMWPE） gel fibers were prepared through swelling, dissolving and extruding stages on a twin-screw mixing extruder, which was produced into UHMWPE fibers after hot drawing process. The effects of the gel spinning process and hot drawing process on the viscose average relative molecular mass （ Mη ） of UHMWPE fi- ber were discussed. The relationship between M and the mechanical properties, thermal property, creep and wear resistance of UHMWPE fiber was also studied. The results showed that the change of shearing strength and high-temperature residence time of feedstocks with the screw rotation rate, dissolution temperature and solution concentration gave a great effect on the degradation degree of UHMWPE molecule while the hot ultra-drawing process had a little effect on the UHMWPE degradation; the strength and creep and wear resistance of the fiber were increased and the melting point and crystallinity were also increased with the in- crease of Mn of the gel fiber as UHMWPE uniformly dissolved ; Mη of the gel fiber was maximized, the fiber surface was not neat and the comprehensive properties became worse as the poor dissolution of UHMWPE happened.

关 键 词：超高相对分子质量聚乙烯纤维 冻胶纺丝 高分子降解 相对分子质量 结构性能 

分 类 号：TQ342.61[化学工程—化纤工业]