Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Preparation and Dielectric Properties of LCP and BaTiO3 Composites

LCP(Liquid Crystal Polymer)와 BaTiO3복합체의 제조 및 유전특성

  • 윤기현 (연세대학교 세라믹공학과) ;
  • 이승주 (연세대학교 세라믹공학과) ;
  • 양병덕 (연세대학교 세라믹공학과) ;
  • 김종희 (삼성전기 주식회사)
  • Published : 2003.12.01
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Abstract

LCP (Liquid Crystal Polymer)/BT(BaTiO$_3$) composite was prepared by mixing LCP varnish and BT slurry. And the effect of the composition of LCP/BT composites and the size of BT powder on dielectric properties of LCP/BT composite were investigated. The dispersion properties of BT slurries were also studied as a function of volume fraction of dispersant, GLYMO (3-glycidyloxypropyltrimethoxysilane) added to various sized BT powders. The quantity of optimum dispersant in BT slurry decreased with an increase of BT powder size because of the decrease of specific surface area of BT powder. LCP/BT composite sheet was prepared by tape-casting method with mixing BT slurry and LCP varnish. The dielectric constant of the composites increased from 34.3 to 44.1 and their dielectric loss increased from 0.05 to 0.063 as the size of BT powder increased from 100 nm to 500 nm.

LCP(Liquid Crystal Polymer)와 BT(BaTiO$_3$) 복합체를 LCP varnish와 BT 슬러리를 혼합하여 제조하고, BT 슬러리 내에서 BT 입자의 분산 특성과 LCP-BT 복합체의 조성 및 BT 분말 크기가 유전 특성에 미치는 영향에 대하여 연구하였다. 분말 크기가 다른 BT 분말에 대하여 분산제 GLYMO(3-glycidyloxypropyltrimethoxysilane) 첨가량에 따른 용매 ODBZ(o-dichlorobenzene) 내에서의 분산 특성을 측정한 결과, BT분말 크기가 증가할수록 비표면적의 감소로 인하여 소요되는 최적 분산제의 양이 감소하였다. 분산된 BT슬러리를 LCP와 혼합하고 테잎 케스팅법을 이용하여 LCP-BT복합체를 제조하였다. BT 입자의 크기가 100nm에서 500nm로 증가함에 따라 복합체의 유전 상수는 34.3에서 44.1로, 유전 손실은 0.05 에서 0.063으로 증가하였다.

Keywords

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