文献类型：期刊文献

英文题名：Nascent particle sizes and degrees of entanglement are responsible for the significant differences in impact strength of ultrahigh molecular weight polyethylene

作者：Zhang, Huan[1];Zhao, Shicheng[1];Yu, Xin[1];Xin, Zhong[1];Ye, Chunlin[2];Li, Zhi[2];Xia, Jincheng[2]

机构：[1]East China Univ Sci & Technol, Dept Prod Engn, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China;[2]Shanghai Res Inst Chem Ind Co Ltd, Shanghai Key Lab Catalysis Technol Polyolefins, State Key Lab Polyolefins & Catalysis, Shanghai 200237, Peoples R China

年份：2019

卷号：57

期号：10

起止页码：632

外文期刊名：JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS

收录：;EI(收录号：20191406723795);WOS:【SCI-EXPANDED(收录号:WOS:000465023300007)】；

基金：This work was financially supported by the National Natural Science Foundation of China (Grants 21878089 and 21476085), National Key R&D Program of China (2016YFB0302201), and the Fundamental Research Funds for the Central Universities (222201717025).

语种：英文

外文关键词：entanglement; impact resistance; interfaces; structure-property relations; ultrahigh molecular weight polyethylene

摘要：The physical properties of ultrahigh molecular weight polyethylene (UHMWPE) are generally highly dependent on its molecular weight. However, in our study, it was found that two UHMWPE samples of similar molecular weight, SLL-5 and GUR 4150, have significantly different impact strengths, with the Charpy impact strength of GUR 4150 being almost 3.4 times that of SLL-5. To reveal the reasons, the structure-property relations of these UHMWPE materials were investigated. Morphologies of the nascent particles and impact fracture surfaces, the melting behavior, rheological behavior, and three-phase (crystalline, amorphous, and interphase) contents were characterized by scanning electron microscopy, differential scanning calorimetry, advanced rotary rheometer, and Raman spectroscopy, respectively. It was observed that no significant differences in the crystal structures of SLL-5 and GUR 4150, but GUR 4150 had smaller nascent particles sizes and a lower degree of entanglement when compared with those of SLL-5. Accordingly, a mechanism to clarify the significant difference in the impact strengths of GUR 4150 and SLL-5 was developed. More importantly, this work may be useful for improving the preparation technologies and industrial applications of UHMWPE. (c) 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 632-641