茂金属耐热聚乙烯管材料的结构与性能

Structure and properties of metallocene polyethylene of raised temperature resistance pipe resin

对3种茂金属耐热聚乙烯(PE-RT)管材料(M 1,M 2和M 3)的基本物性、热性能、相对分子质量及其分布、力学性能、流变性能等进行分析表征,考察了3种PE-RT管材料的性能差异。结果表明:3种PE-RT管材料均属于中密度聚乙烯产品,熔体流动速率相近;3种PE-RT管材料中,国产料M 1,M 2的分子质量分布较宽,熔点较低,结晶度小,韧性较好;进口料M 3的熔体拉伸强度较大,可拉伸性最佳,弯曲弹性模量高,具有良好的刚性。

The basic physical properties,thermal properties,relative molecular mass and its distribution,mechanical properties and rheological properties of three metallocene polyethylene of raised temperature resistant(PE-RT)pipe resin(M 1,M 2 and M 3)were investigated.Analysis and characterization was conducted to investigate the performance differences of the three PE-RT pipe resin.The results showed that the three PE-RT pipe resin were all medium density polyethylene products with similar melt flow rates;among the three PE-RT pipe resin,the domestic resin M 1 and M 2 had wider molecular mass distribution and lower melting point,smaller crystallinity,and better toughness,the imported resin M 3 had higher melt tensile strength,the best stretch ability,high flexural modulus and good rigidity.