Study on Synthesis and Dispersion Characteristics of MWNTslPBO Composites Prepared by In-situ Polymerization.

Dispersion of carbon nanotubes (CNTs) in polymeric matrix is a key factor on forming CNTs/polymer composits. In this work the raw multi-walled carbon nanotubes (MWNTs) at first were treated with a mixed solution of concentrated sulphuric acid and concentrated nitric acid (named as O-MWNTs); then the O-MWNTs were dispersed with ultrasonic in phosphoric acid and the products were denoted as U-MWNTs. Poly(pphenylene-2,6-benzoxazole) (PSO) had been synthesized in the presence of O-MWNTs or U-MWNTs in poly(phosphoric acid) using typical PSO polymerization conditions. Raman spectra, scanning electronic microscope and atomic force microscopy techniques were used to analyze the morphology of MWNTs/PSO composites. Topographies showed the better dispersion of U-MWNTs in the composites.