己烯共聚LLDPE抗老化性研究

Research on Aging Resistance of Hexene Copolymerized LLDPE

对国内外己烯共聚的线型低密度聚乙烯(LLDPE)老化前后的力学性能、端基分布、羰基指数、聚集态结构、分子链支化及分布进行了表征分析与对比评价。结果表明:在老化过程中LLDPE容易发生交联和降解反应;与LLDPE相比,茂金属线型低密度聚乙烯(mLLDPE)的末端含有较多双键,晶片厚度较小,共聚单体更均匀,抗老化能力较差。

The mechanical properties,end-group distribution,carbonyl index,aggregation structure,molecular chain branching and distribution of hexene copolymerized linear low density polyethylene(LLDPE)before and after aging were characterized and compared.The results show that LLDPE is prone to crosslinking and degradation reactions during the aging process.Compared with LLDPE,metallocene linear low density polyethylene(mLLDPE)has more double bonds at the ends,smaller chip thickness,more homogeneous comonomers,and poor aging resistance.