As a part of the project to investigate the effect of surface modification of fiber on the physical properties or performance of carbon fiber reinforced composites based on thermoplastic resins, the coupling agent. high density polyethylene(HDPE)-g-Polyacrylamide(PAAm), has been synthesized by the "inverse emulsion graft polymerization" technique. The polymerization was carried out at 88℃ using benzoyl peroxide (BPO) as initiator in the inverse emulsion system formed by mixing AAm aqueous solution with HDPE(MW=ca. 20,000) in toluene containing Tween ^#80 emulsifier. The reaction has been confirmed through use of optical microscope to proceed via adsorption and immobilization of HDPE molecules onto the surface of emulsifier colloid particles formed. From the analysis of the effects of various polymerization conditions on the grafting, it has also been found that the present reaction system can easily yield high(over 90%) grafting efficiency and AAm conversion, and hundreds percents of percent grafting value.

high density polythylene(HDPE)을 matrix로 한 열가소성수지 탄소섬유 강화복합재료의 표면 효과를 검토하기 위하여 탄소섬유 표면 개질용 coupling agent로 HDPE-g-PAAm를 inverse emul-sion graft 중합법으로 형성하였다. 중합은 유화제인 Tween ^#80을 포함하는 분자량 2만의 HDPE의 toluene 용액에 acryamide(AAm)수용액을 혼합하여 생성된 inverse emulsion에 benzoyl peroxide(BPO)를 개시제로 하여 88℃에서 실시하였으며, 광학현미경으로 colloid를 형성한 유화제 입자표면에 HDPE가 흡착고정되어 중합이 진행됨을 확인하였다. 또한 여러 중합조건이 grafting에 미치는 영향을 검토하였고, 90%이상의 grafting efficiency 및 acrylamide(AAm) conversion 그리고 수백 %의 percent grafting 값들을 용이하게 얻을 수 있었다.

Keywords: