Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
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Miscibility and Compatibilization by Encapsulation of Polycarbonate/Syndiotactic Polystyrene Blends

폴리카보네이트/신디오탁틱 폴리스티렌 블렌드의 상용성 및 Encapsulation 상용화

  • Park, Eun Ju (School of Applied Chemical Engineering, Chonnam National University) ;
  • Jo, Soo Bong (Advanced Chemicals and Engineering, Chonnam National University) ;
  • Lee, Moo Sung (School of Applied Chemical Engineering, Chonnam National University)
  • 박은주 (전남대학교 응용화학공학부) ;
  • 조수봉 (전남대학교 대학원 신화학소재공학과) ;
  • 이무성 (전남대학교 응용화학공학부)
  • Received : 2013.05.19
  • Accepted : 2013.07.13
  • Published : 2013.08.31
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Abstract

The miscibility of the blends of polycarbonate (PC) and syndiotactic polystyrene (s-PS) was investigated by using differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). The blends exhibit two different glass transition temperatures ($T_g$) close to those of the pure components, indicating immiscibility at the melt mixing temperature of $280^{\circ}C$. Morphological studies of the blends shows large dispersed particles and significant cavities between the matrix and the dispersed phase, especially for the PC matrix blends. To reduce such detrimental effects, poly(methyl methacrylate) (PMMA) or styrene-maleic anhydride copolymer (SMA) was added as a compatibilizer to the PC/s-PS blends. Both polymers contribute to enhancing the interfacial adhesion between PC and s-PS and reduce the particle size of the dispersed phase. Especially when PMMA was added, morphological studies showed that PMMA encapsulates the dispersed s-PS phase in the PC matrix. The elastic modulus of the PC/s-PS blend increased on adding PMMA or SMA, mainly because of enhanced interfacial adhesion. The pencil hardness of PC increased at least three times from that of neat PC as a result of compatibilization and surface enrichment of the s-PS phase, whose surface tension is lower than that of PC.

Keywords

References

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