不同抗预交联剂对硅烷接枝聚乙烯稳定性的影响

The Effect of Different Anti-Pre-Crosslinking Agent on the Preparing of Short Chain Branched LLDPE Using Silicane

以线性低密度聚乙烯LL6101与218W为基体,将不饱和硅烷接枝到线性低密度聚乙烯分子链上,并通过加入苯乙烯及已内酰胺来考察两种抗预交联剂对不饱和硅烷接枝线性低密度聚乙烯的影响。通过红外光谱推测了以上两种抗预交联剂参与反应的机理,利用动态频率扫描研究了不同配方体系的流变行为,实验结果表明,两种抗预交联剂均有一定的阻聚作用,其中聚苯乙烯的效果更明显。根据对各体系的反应机理讨论可知,苯乙烯中的共轭作用对硅烷接枝聚乙烯稳定性的影响更明显。对各体系的流变测试结果也验证了以上结论。

Unsaturated silane was grafted to the LL6101 and 218W blended linear low density polyethylene（LLDPE） by means of melt compounding.Styrene and caprolactam were added to the system as anti-pre-crosslinking agents.Infrared spectra and rheological properties of the modified LLDPE were characterized.Accordingly,the reaction mechanisms of the anti-pre-crosslinking agents were deduced.According to the research,it can be concluded that both anti-pre-crosslinking agents can prevent the crosslinking reaction in the system.Comparatively,the conjugated structure of the styrene gives a relatively better anti-pre-crosslinking effect than the LLDPE graft system.And the rheological test results can confirm the above conclusion.