超高分子量聚乙烯烧结制品的链缠结调控及其对性能影响

董澎 王柯 李军方 傅强

引用本文: 董澎, 王柯, 李军方, 傅强. 超高分子量聚乙烯烧结制品的链缠结调控及其对性能影响[J]. 高分子学报, 2020, 51(1): 117-124. doi: 10.11777/j.issn1000-3304.2020.19159 shu
Citation:  Peng Dong, Ke Wang, Jun-fang Li, Qiang Fu. Chain Entanglement Regulation of Sintered Ultrahigh Molecular Weight Polyethylene and Its Effect on Properties[J]. Acta Polymerica Sinica, 2020, 51(1): 117-124. doi: 10.11777/j.issn1000-3304.2020.19159 shu

超高分子量聚乙烯烧结制品的链缠结调控及其对性能影响

    通讯作者: E-mail: qiangfu@scu.edu.cn
摘要: 利用新的单中心Ziegler-Natta (Z-N)催化剂,通过干预分子链的生长与聚集行为,可获得低缠结的超高分子量聚乙烯(UHMWPE)初生树脂. 本研究利用这类低缠结UHMWPE,通过设置不同的烧结温度(Ts)来改变熔体缠结状态,并探讨了链缠结程度对烧结制品结构与性能的影响. 实验结果表明Ts = 220 °C下,UHMWPE样品发生显著的复缠,造成高缠结度;而Ts = 170 °C下,初始低缠结状态能够得以充分保留,从而获得了缠结度具有明显差别的不同样品. 示差扫描量热法(DSC)测试表明,在Ts = 170 °C下,低缠结度有利于在随后等温及冷却结晶过程中生成高熔点(最高达141 °C)晶体与高的结晶度(最高达65%). 力学测试表明低缠结度制品的综合力学性能显著提升,其中屈服强度提高72%,拉伸断裂强度提升139%,弹性模量提升162%以及断裂伸长率提升36%,实现了同时增强增韧. 这就提供了一种从调节链缠结温度实现UHMWPE烧结制品高性能化的新思路.

English


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  • 发布日期:  2020-01-01
  • 收稿日期:  2019-08-29
  • 修回日期:  2019-10-16
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