Effects of Fiber Length on the Reflection Loss of Electromagnetic Wave Absorbing Polypropylene/Carbon Fiber Composites Prepared by Injection Molding and by Screw Extrusion Process

Title
Effects of Fiber Length on the Reflection Loss of Electromagnetic Wave Absorbing Polypropylene/Carbon Fiber Composites Prepared by Injection Molding and by Screw Extrusion Process
Authors
구종민이승환한권형김태석송광호김우년
Keywords
EMI shielding; carbon fiber; polypropylene; composites
Issue Date
2021-03
Publisher
Polymer
Citation
VOL 45, NO 2-190
Abstract
폴리프로필렌(polypropylene, PP)/탄소섬유 복합재료의 반사손실(reflection loss, RL)과 임피던스 매칭(impedance matching) 특성을 두 가지 다른 방법으로 제조된 PP/탄소섬유 복합재료에 관하여 연구하였다. 탄소섬유 함량을 10 wt% 첨가하여 사출성형 가공방법으로 제조된 PP/탄소섬유 복합재료의 RL 값은 -29.1 dB로 나타났고, 같은 탄소섬유 함량을 첨가하여 압출성형 가공방법으로 제조된 PP/탄소섬유 복합재료의 RL 값은 -15.6 dB로 나타났다. 이와 같이 사출성형 방법을 이용하여 제조된 PP/탄소섬유 복합재료의 우수한 RL 특성은 제조된 복합재료의 임피던스 매칭 특성으로 인한 것으로서 이는 사출성형 방법으로 제조된 PP/탄소섬유 복합재료의 섬유길이가 압출성형 방법으로 제조된 복합재료의 섬유길이보다 더 길어서 발생하는 것으로 사료된다. 이상의 결과로부터 효과적인 전자파 흡수 PP/탄소섬유 복합재료를 얻기 위해서는 제조된 복합재료의 섬유길이가 중요한 요인임을 알 수 있다. The reflection loss (RL) performance and impedance matching characteristics of polypropylene (PP)/carbon fiber composite were studied according to two different composite preparation methods. For the PP/carbon fiber composite prepared by injection molding process, the RL value of -29.1 dB was achieved at low carbon fiber content (10 wt%), compared with the composite prepared by screw extrusion process (-15.6 dB). This good RL performance of the PP/carbon fiber composite prepared by the injection molding process was attributed to the impedance matching characteristic originating from the longer fiber length in the composite, than in the composite prepared by screw extrusion. The results suggest that the carbon fiber length in the composite is an important factor to achieve PP/carbon f
URI
http://pubs.kist.re.kr/handle/201004/73007
ISSN
2234-8077
Appears in Collections:
KIST Publication > Article
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