聚丙烯接枝多壁碳纳米管的结构表征

聚丙烯/多壁碳纳米管的混合液，在光引发剂存在下，经紫外光照射24 h，通过自由基的反应，制备了聚丙烯接枝多壁碳纳米管 (PP-g-MWNT)，并用透射电子显微镜(TEM)、傅立叶变换红外光谱(FTIR)、广角X射线衍射(WAXD)、热重分析仪(TGA)、激光拉曼光谱(Raman)进行了表征。结果表明：PP包覆在短的MWNT上，PP-g-MWNT出现PP的特征FTIR峰及WAXD衍射峰，说明PP接枝到MWNT上；连接于MWNT上的PP具有不同的微晶晶型；PP-g-MWNT的接枝率为10.4%左右；经PP接枝后，MWNT本身的结构未发生变化。

Structure Characterization of Polypropylene Grafted Multi-wall Carbon Nanotubes

Polypropylene grafted multi-wall carbon nanotubes(PP-g-MWNT) were prepared through radical reactions in the PP/MWNT suspension irradiated with ultraviolet(UV) for 24 h in the presence of initiator.The existence of PP-g-MWNT structure was confirmed and characterized by means of transmission electron microscope(TEM),Fourier transform infrared spectroscopy(FTIR),Wide-angle X-ray diffraction (WAXD),Thermo gravimetric analysis(TGA).The results showed that PP chains wrapped onto the MWNT of shorter length.The absorptions and diffractions of PP characteristics were found on the FTIR spectrum and WAXD profiles of the PP-g-MWNT, which were indicative of the occurrence of graft reaction.WAXD results also suggested that the grafted PP has different crystal structure from that of the PP control.TGA results showed that the degree of grafting PP onto MWNT was about 10.4wt%.No significant changes were found in the D line and G line of the Raman spectra of the PP-g-MWNT,suggesting that MWNT structure remained unchanged after the grafting reactions.