中文摘要：

甲基丙烯酸缩水甘油酯（GMA）具有双基团,在基质表面聚合成链后仍存在环氧基,可作为合成各种功能材料的媒介。本文利用^60Coγ射线对聚丙烯（PP）预辐照,在超临界二氧化碳（SC-CO2）中进行接枝聚合,制备了PP接枝GMA聚合物PP-g-GMA。采用傅里叶变换红外光谱（FT-IR）、差示扫描量热仪（DSC）、扫描电镜（SEM）、原子力显微镜（AFM）、粒度分析、接触角测试等分析方法对接枝产物进行了表征,测定了接枝聚合物表面的环氧基含量,考察了辐照自由基存放时间对接枝的影响。FT-IR、DSC、SEM、AFM、粒度分析表明接枝物为PP-g-GMA共聚物,接枝链覆盖在PP表面,接枝后PP聚合物熔融焓明显减少;接触角测试分析表明接枝产物亲水性得到改善;接枝聚合物表面富含环氧基,为4.01 mmol/g;实验结果表明：随着存放时间的延长,辐照产生的陷落自由基向烷基过氧化氢及烷基过氧化物转化,可有效控制均聚物的生成。

英文摘要：

Glycidyl methacrylate （GMA） has a pendant epoxy group, through which the grafted polymer can be chemically coupled with a selected compound having a functional group. In this paper, GMA was grafted onto ^60 Co γ-irradiated polypropylene （PP） in supercritical carbon dioxide. The properties of the grafted samples were characterized by using Fourier transform infrared spectrometer （FT-IR）, differential scanning calorimeter （DSC）, scanning electron microscopy （SEM） ,atomic force microscopy （AFM） and particle size distribution measurements . It revealed that the synthesized polymer was PP-g-GMA, the surface of the polymer was covered by GMA chain and the heat of fusion was reduced. Contact angle measurement observed that grafting with GMA improved the wettability of PP. It showed that the content of epoxy group on PP-g-GMA was 4.01 mmol/g, and the homopolymer reaction could be controlled as the free radical converted to hydrogen peroxide.