苯乙烯/二乙烯苯协助马来酸酐熔融接枝聚丙烯研究  

Melt Grafting of Polypropylene with Maleic Anhydride Assisted by Styrene/Divinylbenzene

作　　者：祝宝东[1] 王鉴[1] 李红伶[1] 董维超[1] 董群[1] 

机构地区：[1]东北石油大学化学化工学院,黑龙江大庆163318

出　　处：《中国塑料》2012年第6期50-56,共7页China Plastics

摘　　要：采用液-固溶胀的方法将马来酸酐(MAH)、共单体[苯乙烯(St)、二乙烯苯(DVB)]和引发剂过氧化二异丙苯分散到聚丙烯(PP)颗粒内部,利用流变仪研究了共单体协助MAH熔融接枝PP反应,采用红外光谱、热重分析和水接触角对接枝物的结构及性能进行分析,并对接枝反应机理加以探讨。结果表明,在最优反应条件下,添加St时接枝物的MAH接枝率和凝胶率分别为2.25%、1.56%;添加DVB时接枝物的MAH接枝率和凝胶率分别为3.06%、46.31%,并且接枝物的热稳定性和极性均有不同程度提高;接枝机理分析认为,在接枝反应时共单体首先接枝到PP链上,有效抑制了PP的降解,并与MAH主要以共聚形式接枝到PP主链上;DVB在分子结构上比St多了一个碳碳双键,一方面显著提高MAH接枝率,另一方面明显增大接枝PP大分子自由基间双基偶合终止的机会。Maleic anhydride （MAH）, styrene （St）, divinylbenzene （DVB）, and initiator （DCP） were embedded into polypropylene （PP） via liquid-solid swelling process. The effect of the co monomers on the melt grafting of maleic anhydride （MAH） onto PP backbone was studied. Structure and properties of grafted products were analyzed using Fourier transform infrared spectroscopy, thermo gravimetric, and water contact angle. At the same time, the mechanism of grafting reaction was discussed. It showed that the grafting ratio of MAH and gel content of grafted products were 2.25 % and 1.56 % respectively when St was used alone. However, when DVB was used alone, these values increased to 3.06% and 46.31 %, the thermal stability and polarity of grafted products were improved in different degrees. Through analyzing the mechanism of grafting reaction, it indicated that the PP macro-radicals were first reacted with the co-monomers, followed by the grafting reaction, thus depressed degradation of PP. DVB possessed two double bonds per molecule, it could be more effective in grafting and coupling between PP macro-radicals.

关 键 词：聚丙烯 马来酸酐 二乙烯苯 苯乙烯 共单体 熔融接枝 接枝率 凝胶率 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]