Polymer(Korea) (폴리머)

The Polymer Society of Korea (한국고분자학회)
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Baroplastic Properties of Core-double Shell Type Nanoparticles Consisting of Crosslinked PS as a Core and PBA and PS as Shells

가교된 PS 코어와 PBA 및 PS 셸로 이루어진 코어-더블셸형 나노입자의 압력가소성

  • Park, Ji-Young (Department of Engineering Chemistry, College of Engineering, Chungbuk National University) ;
  • Ryu, Sang-Woog (Department of Engineering Chemistry, College of Engineering, Chungbuk National University)
  • 박지영 (충북대학교 공과대학 공업화학과) ;
  • 류상욱 (충북대학교 공과대학 공업화학과)
  • Received : 2013.08.30
  • Accepted : 2013.10.12
  • Published : 2014.01.25
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Abstract

Polymer nanoparticles with cross-linked core and PBA/PS double-shell were synthesized and their baroplastic properties were characterized. PBA/PS, the inner and outer shell with cross-linked core consisting of St and DVB were synthesized by three-stage emulsion polymerization. The obtained materials exhibited pressure-induced mixing of their components and could be processed at $25^{\circ}C$ by compression molding which means there was no effect of the presence of cross-linked core. Interestingly, the Young's modulus of molded objects has found to be affected strongly by the size of double-shell nanoparticles. Furthermore, the molded object of higher PBA content was successfully recycled 5 times at $25^{\circ}C$ and showed 0.55 MPa of modulus and 1.81 MPa of strength at break.

가교결합된 코어와 PBA, PS 더블-셸을 갖는 고분자 나노입자를 제조하고 압력가소 특성을 평가하였다. 더블-셸을 합성하기 위해 먼저, 가교된 코어입자를 St, DVB의 에멀션 중합을 통해서 제조하였으며, 이어서 PBA가 내부셸, PS가 외부셸을 형성하도록 3 단계의 연속적인 에멀션 중합을 수행하였다. 제조된 더블-셸 나노입자는 가교된 코어의 존재에도 불구하고 PBA, PS 간 압력상용성을 발견할 수 있었으며, $25^{\circ}C$에서 반투명한 시편으로 압출성형될 수 있었다. 기계적 물성측정 결과, 성형물의 탄성계수는 더블-셸 나노입자의 크기에 직접적으로 연관됨을 알 수 있었다. 또한 PBA가 과량으로 첨가된 시편의 경우, $25^{\circ}C$에서 재가공이 성공적으로 진행되어 5회의 연속된 압출성형에도 불구하고 0.55MPa의 탄성계수와 1.81 MPa의 파단강도를 얻을 수 있었다.

Keywords

Acknowledgement

Supported by : 충북대학교

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