Synthesis of Atactic Polypropylene-Polyacrylamide Graft Polymer and Adsorption on the Surface of Carbon Fiber

Atactic Polypropylene-Polyacrylamide 그라프트 중합체의 합성과 탄소섬유 표면에 대한 흡착

As a surface modifier, atactic polypropylene(APP)-g-polyacrylamide(PAAm) had been synthesized by inverse emulsion graft polymerization technique emulsifying the toluene solution of APP(Mw 8,000) containing tween #80(an emulsifier) and aqueous acrylamide(AAm) solution. The elects of various polymerization conditions on the AAm conversion, grafting efficiency, and % grafting had been investigated and the results were compared with those of the graft polymerizations of AAm onto isotactic polypropylene(IPP) (Mw 200,000) and high density polyethylene(HDPE) (Mw 20.000) by the same method. Those values were decreased with the increase of rpm. And the reducing phenomena for those values appeared at lower rpm and were more pronounced with the increasing rpm compared with those phenomena of the graftings onto IPP and HDPE. On the other hand, carbon fibers were treated with aqueous dispersion solution of water-dispersible graft polymer(WDGP) (isolated from gross polymers) under several concentrations. Temperatures treating times and pH values of solution. The effects of those conditions on the adsorption amount were investigated and compared with those in the adsorption of water-dispersible IPP-g-PAAm and HDPE-g-PAAm. The optimum adsorption appeared at lower treating temperature (4$0^{\circ}C$) than those(80~86$^{\circ}C$) for the graft polymers of IPP and HDPE.