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Study on GO Dispersion of PC/GO Composites according to In-situ Polymerization Method

In-situ 중합방법에 따른 폴리카보네이트(PC)/그래핀 옥사이드(GO) 복합체의 GO 분산성 연구

  • Lee, Bom Yi (Major in Polymer Science and Engineering, Kongju National University) ;
  • Park, Ju Young (Major in Polymer Science and Engineering, Kongju National University) ;
  • Kim, Youn Cheol (Major in Polymer Science and Engineering, Kongju National University)
  • 이봄이 (공주대학교 신소재공학부 고분자공학전공) ;
  • 박주영 (공주대학교 신소재공학부 고분자공학전공) ;
  • 김연철 (공주대학교 신소재공학부 고분자공학전공)
  • Received : 2015.03.16
  • Accepted : 2015.04.13
  • Published : 2015.06.10

Abstract

Three different types of polycarbonate (PC)/graphene oxide (GO) composites using diphenyl carbonate as a monomer were fabricated by melt polymerization. Those were the PC/GO composite (PC/GO) using a twin extruder, in-situ PC/GO composite (PC/GO-cat.) using a catalyst, and in-situ PC/GO composite (PC/GO-COCl) using a GO-COCl treated by -COCl, Chemical structures of the composites were confirmed by C-H and C=O stretching peak at $3000cm^{-1}$ and $1750cm^{-1}$, respectively. The slope for the storage (G') versus loss (G") modulus plot decreased with an increase in the heterogeneous property of polymer melts. So we can check the GO dispersion of the PC/GO composites using by the slop for G'-G" plot. According to the G'- G" slopes for three different types of PC/GO composites, GO was well dispersed within PC matrix in case of PC/GO and PC/GO-cat.. It was also confirmed by atomic force microscope (AFM) photos. One of the reasons for the poor GO dispersion of PC/GO-COCl is branching and crosslinking processes occurred during polymerization, which was further confirmed by a plot for the complex modulus versus phase difference.

Keywords

Polycarbonate;Melt polymerization;Catalyst;GO modification

Acknowledgement

Supported by : 한국연구재단

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