摘要
研究了二丙烯酸酯参与的反应挤出制备长链支化聚丙烯过程,重点考察了二丙烯酸酯双键间链段长度以及单体用量对长链支化程度的影响。结果表明,1,4-丁二醇二丙烯酸酯(BDDA)在聚丙烯分子链上具有较强接枝能力;在接枝率相当的情况下,悬垂双键参与偶合扩链的能力会随双键间链段长度增加而下降。单体接枝率增加以及悬垂双键反应能力增强均会使长链支化程度增大。随着二丙烯酸酯用量增加,长链支化程度增加;单体过量会使大分子自由基偶合扩链程度加重,导致局部交联形成凝胶。
The preparation process of long-chain branched polypropylene by reactive extrusion in the presence of diaerylate was studied, with emphases on the effects of space length of diacrylates and the usage of monomers on the branching degree of long-chain. It was found that 1, 4-butanediol diacrylate （BDDA） demonstrated strong capability of grafting onto PP chains. Under the comparable level of grafting ratio, the reactivity of the pendent double bonds to the coupling reaction decreased as the space length of diacrylate increased. The increase of grafting ratio and the reactivity of pendent double bonds both contributed to the increase of the degree of long-chaining. By raising the usage of diacrylate in the reactive extrusion, the degree of long-chain branching was increase, however, excessive diacrylate usage would heavily promote the chain coupling reaction, giving rise to local crosslinking and the formation of gels.
出处
《塑料工业》
CAS
CSCD
北大核心
2011年第12期11-14,21,共5页
China Plastics Industry
关键词
长链支化聚丙烯
二丙烯酸酯
反应挤出
Long Chain Branched Polypropylene
Diacrylate
Reactive Extrusion
