氧化聚丙烯的存储与固相接枝研究

Storage and Solid-Phase Grafting of Oxidized Polypropylene

考察了氧化聚丙烯(OPP)的存储条件,研究了共单体苯乙烯(St)、二乙烯苯(DVB)和季戊四醇三丙烯酸酯(PETA)对马来酸酐(MAH)固相接枝OPP的影响,并利用傅里叶变换红外光谱(FT-IR)对接枝物结构加以表征。实验结果表明,随存放时间增加氢过氧化物含量呈现先快后慢的下降趋势,保护气氛和温度对OPP储存均能产生一定的影响;St、DVB和PETA对MAH接枝OPP均具有明显的改善作用,MAH的接枝效率分别达到74.80%、94.31%、76.33%,并且加入St、PETA的接枝物凝胶率远远低于加入DVB的接枝物。FT-IR分析表明,MAH和共单体与OPP发生了接枝共聚反应,多官能团共单体PETA的C=C双键部分参与了接枝反应,DVB的乙烯基则反应比较完全。

The storage condition of oxidized polypropylene （OPP） was investigated. The effects of co-monomers styrene （St）, divinyl benzene （DVB） and pentaerythritol triaerylate （PETA） on grafting maleic anhydride （MAH） solid-phase onto OPP backbone were studied. The grafted copolymer structure was characterized by Fourier transform infrared spectroscopy （FT-IR）. The results show that, with the increase of storage time, the content of hydroperoxide appears a quick decline in the initial stage and then the decline slows down in the later stage; the protective atmosphere and temperature can influence the storage of OPP. St, DVB and PETA may all significantly improve the rate of MAH grafting onto polypropylene, and they may cause the grafting efficiency of MAH to reach 74.80%, 94.31% and 76.33%, respectively. At the same time, the gel of grafting products which have added St and PETA is far lower than that of the one which has added DVB. FT-IR analysis shows that the MAH and co-monomer are grafted onto OPP, and the partial C=C double bond of polyfunctional co-monomer PETA involves in the grafting reaction. However, the vinyl of DVB has been almost completely reacted in the grafting reaction.