Polymer(Korea) (폴리머)

The Polymer Society of Korea (한국고분자학회)
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Blending of Silica Nanoparticles with PBA/PS Core-Shell Baroplastic Polymers

PBA/PS 코어-셀 압력가소성 고분자와 실리카 나노입자의 블렌딩

  • Kim, Min-Jeong (School of Chemical Engineering, College of Engineering, Chungbuk National University) ;
  • Choi, Yong-Doo (Molecular Imaging and Therapy Branch, National Cancer Center) ;
  • Ryu, Sang-Woog (School of Chemical Engineering, College of Engineering, Chungbuk National University)
  • 김민정 (충북대학교 공과대학 화학공학부) ;
  • 최용두 (국립암센터 분자영상치료연구과) ;
  • 류상욱 (충북대학교 공과대학 화학공학부)
  • Published : 2008.11.30
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Abstract

PBA/PS core-shell polymer nanoparticles were synthesized by two stage emulsion polymerization and hybridized with silica nanoparticle by simple mixing in emulsion state and following precipitation into water/methanol mixture dissolving $Na_2CO_3$. The stress-strain curve revealed that the elastic modulus was increased with increasing molecular weight of polymer and silica weight fraction but decreased with increasing size of core-shell nanoparticle. Especially, there was a rapid increase of elastic modulus with silica blending. As a result, 6 times higher elastic modulus was observed in PBA/PS core-shell baroplastic sample processed at 25$^\circ$C under 13.8 MPa for 5 min by blending with 13.0 wt% of silica nanoparticle.

두 단계 에멀젼 중합을 통해 PBA/PS 코어-셸 고분자 나노입자 및 실리카가 함유된 유기-무기 하이브리드 재료를 합성하였다. 실리카 나노입자는 코어-셸 고분자 에멀젼과 혼합되어 $Na_2CO_3$가 녹아있는 증류수/메탄올의 혼합용매에 침전되었다. 건조 후 압축성형으로 제조된 시편의 물성평가를 통해 탄성계수는 코어-셸 나노입자의 크기가 작을수록, 분자량이 클수록, 실리카가 많이 첨가될수록 증가함을 확인하였다. 또한 PBA/PS 코어-셸 고분자는 실리카가 13.0 wt% 첨가되었음에도 불구하고 25$^\circ$C, 13.8 MPa, 5분의 조건에서 우수한 압력가소성 특징을 나타내었으며 6배 이상 증가된 탄성계수가 얻어졌다.

Keywords

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