马来酸二丁酯固相接枝聚丙烯

Solid phase grafting of dibutyl maleate onto polypropylene

以马来酸二丁酯(DBM)为单体,在自制的固相反应器中,采用先降解、后固相接枝技术,制备了具有高流动性的马来酸二丁酯接枝聚丙烯(PP-g-DBM),并表征与分析了该接枝物结构,研究了反应时间、引发剂和单体用量对接枝率的影响,考察了相对分子质量、熔体流动速率(MFR)与反应时间的关系。结果表明:在混合引发剂质量分数为6％、w(DBM)为10％、反应温度为100～120℃的条件下,PP在降解3 h后,再接枝3 h,可以得到相对分子质量为5×104、MFR为650-750 g/10 min、接枝率为7％的PP-g-DBM。

A kind of high flowability polypropylene grafted with dibutyl maleate （PP-g-DBM） was prepared in a home-made solid phase reactor with the technology involving initially degrading PP and then grafting the resultant in solid phase. The graft was characterized by Fourier transform infrared spectroscopy and differential scanning calorimetry. The effects of reaction time, initiator dosage and monomer concentration on graft ratio were studied. The dependences of relative molecular mass and melt flow rate （MFR） on reaction time were also explored. The results show that PP-g-DBM with relative molecular mass of 5×10^4, MFR of 650 - 750 g/10 min and grafting ratio of 7% can be acquired after degrading PP for 3 hours and then grafting it for another 3 hours under the conditions of setting mass fraction of the initiator at 6%, DBM concentration at 10% and reaction temperature at 100 - 120℃.