摘要
分析了3种聚乙烯的结构与性能。结果表明:PE-1为线型聚乙烯;PE-2,PE-3为支化聚乙烯,支化度分别为0.83%,1.94%(y);PE-1的相对分子质量约为50000,而PE-2和PE-3的相对分子质量均低于50000;随着支化度的增加,PE-1,PE-2,PE-3的熔点和焓变依次降低;随着支化度增加,聚乙烯的结晶度、机械强度下降,断裂拉伸应变提高。
The structure and properties of three kinds of polyethylene(PE)were tested and analyzed.The results show that PE-1 is linear polyethylene,PE-2 and PE-3 are branched polyethylene,whose branching degrees are 0.83%and 1.94%respectively.The relative molecular mass of PE-1 is about 50000,while those of PE-2 and PE-3 are lower than 50000.The melting point and enthalpy of PE-1,PE-2 and PE-3 are decreased with the increase of their branching degree.The crystallinity and mechanical properties of PE decrease with the degree of branching increasing,while their elongation at break increase.
作者
李小梅
吴春山
Li Xiaomei;Wu Chunshan(Ya′an Vocational and Technical College,Ya′an 625000,China;Chongqing University,Chongqing 400044,China)
出处
《合成树脂及塑料》
CAS
北大核心
2020年第6期60-63,共4页
China Synthetic Resin and Plastics
关键词
聚乙烯
支化度
结构检测
性能分析
polyethylene
branching degree
structure detection
performance analysis
