In-situ compositing of carbon black/polyacrylonitrile composites with NaSCN aqueous as solvent

摘要

The black spinning dope of polyacrylonitrile (PAN) was prepared by in-situ compositing of carbon black (CB) in the process of solution copolymerization of acrylonitrile (AN) and methyl acrylate (MA) with NaSCN aqueous as solvent. From the result of scanning electron microscopy, it is found that CB dispersed uniformly with the size of 50-150nm in PAN matrix. Washing test indicated that composites prepared by in-situ compositing had stronger interfacial interaction between CB and PAN matrix than that prepared by blending. The effects of CB on copolymerization kinetics and rheological behavior of CB/PAN dope were also investigated. It indicated that the conversion and molecular weight of PAN in the resulting composites decreased with the increase of CB content due to the inhibition of CB during the polymerization while the molecular weight changed little. The dynamic rheological measurement indicated that viscosities of CB/PAN composites in NaSCN aqueous increased with the increase of CB content. In addition, the loss and storage modulus values became large as the CB content increased. It also suggests that there exists stronger interfacial interaction between CB and PAN macromolecules.