聚丙烯纳米复合材料的热老化  

Thermal Aging of Polypropylene Nanocomposites

作　　者：李吉芳[1] 杨睿[1] 于建[1] 刘颖[1] 

机构地区：[1]清华大学化工系高分子研究所,北京100084

出　　处：《高分子材料科学与工程》2008年第10期103-106,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金重点项目(50533070)

摘　　要：研究了纳米碳酸钙、纳米氧化硅对聚丙烯热老化行为及机理的影响。由于无机纳米粒子的存在,复合材料的老化速率远大于纯聚丙烯。不同于共识的氧化降解机理,聚丙烯纳米复合材料的破坏并不是由氧化引起。老化过程的显微观测和结晶度变化表明,材料破坏的可能原因:一是无机纳米粒子的聚集形成的缺陷,二是聚丙烯的重结晶收缩产生的应力。薄膜和厚试样具有相同的试验结果。The thermal aging behavior of polypropylene （PP） nanocomposites film at 130℃ was investigated. The results show that the thermal aging of PP nanocomposites is much faster than that of PP. Differing from the widely accepted thermal oxidation mechanism, there is no obvious oxidation in PP nanocomposites during the testing period. The crack formation depended on two factors： one is the aggregation of nano particles, which is responsible for the deterioration of the mechanical properties. Another is contraction stress due to the re-crystallization of PP under the aging temperature. Same results were obtained in thick samples of about 4 mm in thickness.

关 键 词：聚丙烯 纳米复合材料 热老化 

分 类 号：TB383[一般工业技术—材料科学与工程]