【摘要】 将紫外辐射技术应用到本体接枝改性,成功制备了聚丙烯的马来酸酐-苯乙烯接枝物(PP-g-(MAH-co- St)),并用红外光谱对接枝物进行了表征。研究了紫外光辐照时间、单体及引发剂(BP)浓度等因素对接枝率及熔体流动速率的影响。结果显示,辐照时间为30 s时,接枝效果最佳。接枝率及熔体流动速率随BP含量的增加呈现先增加后降低的趋势,分别在BP用量为0.6 g/100g PP及0.4 g/100g PP时达到最佳值。MAH及St浓度对接枝率及熔体流动速率的影响与BP浓度的影响相似,其最佳用量为4 g/100 g PP。St的存在对接枝反应有明显的改善作用。接枝物的热性能分析显示,接枝PP的结晶及熔融温度都有所变化,说明接枝反应对PP的晶体形貌及尺寸有显著影响。更多还原

【Abstract】 Maleic anhydride(MAH) and styrene(St) grafted onto polypropylene(PP) were prepared by UV ir- radiation.Effects of the irradiation time,monomer and initiator content on the grafting rate and melt flow rate(MFR) were studied.The results show that the optimal duration of UV irradiation is 30s.The grafting rate increases with ini- tiator content when initiator content less than 0.6 phr,the MFR value of grafted PP reaches the highest point when benzophenone(BP) content is 0.4 phr.The content of MAll and St have an effect on the grafting rate and MFR value of the grafted PP,and the optimal contents of monomer is 4 phr.The existence of St as a co-monomer reduces appar- ently the MFR value of grafted PP greatly.Grafted PP present significant changes in crystallization and fusion peaks, indicating differences in crystal size and formation after grafting reaction.更多还原