管材专用耐热聚乙烯的等温结晶行为

Isothermal crystallization behavior of PE-RT tube material

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70 min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。

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-1has 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.