预辐照PE接枝PS的制备及性能表征

将聚乙烯（PE）进行预辐照，采用悬浮接枝聚苯乙烯（PS）制备聚乙烯接枝聚苯乙烯（PE-g-PS）。利用红外光谱（FTIR）、核磁共振氢谱（1H-NMR）、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）、差热扫描量热仪（DSC）、击穿场强及流变测试等对PE-g-PS的结构及性能进行表征。结果表明：PE-g-PS的FTIR谱图在1602cm-1，3026cm-1，和3060cm-1处出现明显吸收峰；PE-g-PS的1H-NMR谱图在化学位移为6.5~7.0ppm之间出现了新峰，这是苯环上H的化学位移；证明PS与PE接枝成功。与PE相比，PE-g-PS的结晶温度升高4oC，复合粘度降低，击穿场强提高4.6kv/mm。

Preparation and Properties of Polyethylene grafted Polystyrene by Pre- irradiation Suspending Grafting

PE-g-PS graft copolymers were prepared by using pre-irradiation PE suspending grafting polystyrene. Prop-erties and structure of PE-g-PS were characterized by Fourier transform infrared spectroscopy (FTIR), 1H nuclear magnetic resonance (1H-NMR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), differential scanning calorimety (DSC), breakdown field strength and rheological measurements. The results show that some new peaks at 1602cm-1,3026cm-1 and 3060cm-1 appear in the FTIR spectra of PE-g-PS. The 1H-NMR spectra of PE-g-PS show new chemical shift peaks at 6.5~7.0ppm which are attributed the H from benzene ring. The results indicate that PS has been successfully grafted onto PE. The viscosity of PE-g-PS is lower than that of PE. Compar-ing with PE, the crystallization temperature of PE-g-PS increases 4oC and the breakdown field strength of PE-g-PS increases 4.6kv/mm.