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对聚丙烯(PP)采用先降解、后固相接枝技术,制备了具有高流动性的聚丙烯接枝马来酸二丁酯(PP-g-DBM)接枝物,并用红外光谱(FTIR)和差示扫描量热法(DSC)对接枝物结构进行了分析与表征,研究了接枝率对接枝物熔体流动速率(MFR)、分子量和流变性能的影响。结果表明:接枝改性后PP的熔点比纯PP有所下降,MFR和非牛顿指数却有所提高;随着接枝率的提高,接枝物的分子量降低,MFR提高,可达到750 g/10min,表明改性后PP的流变性能得到了明显改善。
PP-g-DBM graft copolymers with high flowability were prepared by first degrading and post-solid-phase grafting on polypropylene (PP). The graft copolymers were characterized by FTIR ) And differential scanning calorimetry (DSC) were used to characterize the graft structure. The effects of graft ratio on the melt flow rate (MFR), molecular weight and rheological properties of the graft were studied. The results showed that the melting point of PP after grafting was lower than that of pure PP and the MFR and non-Newtonian index increased. With the increase of grafting rate, the molecular weight of grafted product decreased and MFR increased to 750 g / 10min, indicating that the modified PP rheological properties have been significantly improved.