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Thermotropic Liquid Crystalline Polymer/Carbon Fiber Composite by Using In-situ Graft Polymerization
( Chul Rim Choe ),( Kwang Hee Lee ),( Jyong Sik Jang ) 한국공업화학회 1991 한국공업화학회 연구논문 초록집 Vol.1991 No.0
Thermotropic liquid crystal polymers are a new class of high performance engineering thermoplastics. The superior properties of these liquid crystal polymers might be linked in part to orientational self-ordering of their constituent semi-rigid chains. In addition, their excellent physical properties make them attractive candidates for matrix in advanced composites. In order to synthesize thermotropic liquid crystalline polyester, pimelic acid, p-acetoxybenzoic acid and diacetoxyhydroquinone were used as monomers for this study. By using in-situ polymerization, liquid crystalline polyester was grafted on the surface of carbon fiber effectively. For the creation of active sites onto the carbon fiber, plasma etching method was used and the modification of carbon fiber surface has been carried out as a function of plasma treatment time. In the case of untreated carbon fiber, mechanical properties of liquid crystalline composite increase with increasing the volume fraction of carbon fiber. From the data of mechanical properties for liquid crystalline polymer composites, maximum values of flexural and tensile properties have been occurred at 7.5 min of plasma treatment time SEM and optical microscopic analyses have also confirmed that mechanical properties of liquid crystalline composites have been improved with increasing plasma treatment time of carbon fiber surface.
최철림 ( Chul Rim Choe ) 한국복합재료학회 2013 Composites research Vol.26 No.3
탄소나노튜브(CNT)와 그래핀 같은 나노카본은 기계적 성질이 탁월하고 직경 대 길이의 비가 커서 고분자 복합재료의 강화재로 이상적인 것으로 생각된다. 그 동안 나노탄소의 특성을 복합재료에 그대로 전환시키기 위한 많은 연구들이 있었지만 여전히 해결되지 않은 많은 문제, 예를 들면 효율적인 공정의 개발 등이 숙제로 남아 있다. 이 총설에서는 CNT와 그래핀을 이용하는 나노탄소 고분자 복합재료 분야에서 이룬 그 간의 발전을 살펴보았으며, 여러 가지 나노탄소 고분자 복합재료에서 기계적인 강화가 어느 정도 이루어지는지 비교, 분석하고 향후 연구개발 방향을 전망하였다. Nanocarbons such as carbon nanotubes (CNT) and graphene are considered to be ideal fillers for polymer composites, because of their outstanding mechanical properties and high length-to-diameter ratio. There has been much effort to realize the implementation of their full potential, but a large number of unsolved problems still must be challenged, for example, effective processing for fabrication. This review deals with the progress that has already been made in the area of nanocarbon polymer composites using CNT and graphene. Mechanical reinforcement of various nanocarbon polymer composites is analyzed and compared, and future perspectives in research and development that need to be done are discussed.