管材专用耐热聚乙烯的等温结晶行为

摘要

The oxidation induction time, impact property, isothermal crystallization behavior, molecular weight and molecular weight distribution of two polyethylene of raised temperature resistance(PE-RT) tube materials were observed. The results indicate that the oxidation induction times of both PE-RT tube materials are above 70 min at 210 ℃; crystallization temperature of PE-1 is 119.0 ℃, higher than that of PE-2; PE-1 has higher rate of crystallization, which is in favor of rapid prototyping; the high molecular weight and wide molecular weight distribution of PE-1 benefit to improve the static hydraulic strength of tube.%研究了两种管材专用耐热聚乙烯（PE-RT）的氧化诱导时间、抗冲击性能、等温结晶行为、相对分子质量及其分布等。结果表明：210℃时，两种PE-RT的氧化诱导时间均在70min以上；其中一种PE-RT的结晶温度较高（119.0℃），结晶速率较快，更有利于满足快速成型加工的需要，其相对分子质量分布较宽、重均分子量较高，有利于提高管材的静液压强度。