碳纳米管结构对聚乙烯/碳纳米管纳米杂化串晶的影响

Influence of Carbon Nanotube Structure on Polyethylene / Carbon Nanotube Nanohybrid Shish-Kebab

通过溶液等温结晶技术制备了聚乙烯/碳纳米管纳米杂化串晶(Nanohybrid shish-kebab),利用透射电子显微镜观察了纳米杂化串晶的形貌,讨论了不同结晶条件,尤其是碳纳米管的直径对串晶形貌的影响。结果表明,聚乙烯片晶在多壁碳纳米管表面能够实现可控周期性修饰,较小直径的Ⅰ-MWNT的异相成核能力更强,在其表面所生长的kebab密度较大,但结构规整性较差,而在较大直径的Ⅱ-MWNT表面所生长的kebab结构更为规整。碳纳米管的直径对纳米杂化串晶的形成和形貌有重要影响。

The polyethylene / carbon nanotube nanohybrid shish-kebabs were prepared by isothermally solution crystallization method. The morphologies of nanohybrid shish-kebabs were observed by TEM.The influence of crystallization conditions, especially the diameter of carbon nanotube, on the morphologies of nanohybrid shish-kebabs was discussed. The results show that the controlled periodic modification of polyethylene kebab on the surface of multi-walled carbon nanotube could be achieved.Moreover,Ⅰ-MWNT with smaller diameters possessed stronger heterogeneous nucleation ability,and the density of polyethylene kebab on its surface was larger with worse structure regularity. However,the structure of polyethylene kebab on the surface of Ⅱ-MWNT with larger diameters was more regular.Generally,the diameter of carbon nanotube plays an important role in determining the formation and morphologies of nanohybrid shish-kebabs.