管材专用耐热聚乙烯树脂的结构与性能

摘要

采用凝胶渗透色谱、核磁共振碳谱、差示扫描量热法等分析了牌号分别为4731B，SP980，DX800的进口管材专用耐热聚乙烯（PE-RT）的性能及分子结构、相对分子质量及其分布、共聚单体种类及含量、结晶性能等。结果表明：3个牌号的PE-RT均为中、高密度聚乙烯产品（密度为0.935~0.947g/cm3），其中，4731B为乙烯与1-丁烯的共聚物，共聚单体含量低于SP980和DX800，相对分子质量分布较宽，结晶度为63%，晶片厚度为39.27nm，晶粒尺寸较大，说明其具有较好的结晶性能。%The properties and molecular structure, relative molecular mass and its distribution, type and content of comonomers and crystallization properties of imported raised temperature resistance polyethylene (PE-RT) including 4731B, SP980, DX800 for pipes were analyzed by gel permeation chromatography (GPC), carbon nuclear magnetic resonance (13C-NMR), differential scanning calorimetry (DSC), etc. The results show that three types of PE-RT are medium or high density polyethylene products whose density is 0.935-0.947 g/cm3. 4731B is an ethylene and 1-butene copolymer, which has content of copolymerization monomer less than those of SP980 and DX800, wider relative molecular mass distribution, crystallinity of 63%, wafer thickness of 39.27 nm and larger grain size, indicating that the crystallization behavior of the resin is good.