Abstract

Exfoliation and preparation of large interlayer spacing and reactive graphene oxide (GO) powder are of crucial importance and neck technologies for their applications in polymer composites. Herein, we reported an innovative approach to prepare a large interlayer spacing reactive NCO-GO powder by covalent functionalization of GO with 4,4’-diphenylmethane diisocyanate (MDI). The morphology, microstructure, interlayer spacing, dispersion, and thermal stability of the NCO-GO powder were seriously investigated by FT-IR, XPS, XRD, TEM, TG, and Raman. Interlayer spacing of NCO-GO nanosheets was successfully expanded from 0.83 nm to 2.43 nm after modification, the NCO-GO powder showed better dispersion stability than GO in polar solvents and higher decomposition temperature. The fabricated novel NCO-GO powder showed a great prospect in the future to prepare graphene-based PU composites with significantly enhanced electrical conductivity and mechanical properties of PU elastomer.

抽象的

剥落和制备大的中间层间距和反应性​​氧化石墨烯（GO）粉末对于它们在聚合物复合材料中的应用至关重要。在这里，我们报道了一种创新的方法，可以通过GO与4,4'-二苯基甲烷二异氰酸酯（MDI）的共价官能化来制备较大的层间距反应性NCO-GO粉末。FT-IR，XPS，XRD，TEM，TG和Raman对NCO-GO粉末的形貌，微观结构，层间间距，分散性和热稳定性进行了认真研究。改性后，NCO-GO纳米片的层间距成功地从0.83nm扩大到2.43nm，在极性溶剂中，NCO-GO粉体的分散稳定性优于GO，且分解温度较高。