• Thermal Properties and Polymorphism of Syndiotactic-Polystyrene and Atactic-Polystyrene Blends
  • Min KE, Hong S, Lee DH
  • Syndiotactic-Polystyrene과 Atactic-Polystyrene 블렌드의 열적성질 및 Polymorphism
  • 민경은, 홍성화, 이동호
Abstract
Thermal properties and crystallization characteristics were studied for the blends of syndiotactic-polystyrene (sPS) and atactic-polystyrene (aPS) which were prepared from a coprecipitation method. DSC and XRD results revealed that the melt crystallization temperature was decreased with increase of aPS ratio, and that the aPS in the blend system was considered to promote formation of the orthorhomic crystal structure having defects, i.e., β'structure. The polymorphic behavoir of the sPS was also observed in the blends of sPS/aPS. It was found by the study of XRD and thermal properties of the samples that the sPS is miscible with aPS.

공침전법에 의하여 sPS와 aPS를 블렌드시키고 이들의 열적성질 및 결정화 특성을 조사하였다. DSC 분석결과 sPS에 aPS가 첨가됨에 따라 결정화 온도는 감소하는 것으로 나타났으며, 결함을 함유한 사방정계 구조인 β' 형으로의 전이가 보다 쉽게 나타나는 것으로 나타났다. 이러한 경향은 X-선 분석 (XRD)결과로도 확인하였으며, sPS의 경우와 마찬가지로 sPS/aPS 블렌드에서도 sPS의 polymorphism이 관찰되었다. 열 분석 및 XRD 분석 결과로 sPS가 aPS와 상용성을 갖는 것으로 해석할 수 있었으며 톨루엔 증기로 추출한 블렌드들의 전자현미경 분석으로 이를 확인하였다.

Keywords: blends; syndiotacitic-polystyrene; atactic-polystyrene; polymorphism; thermal properties

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This Article

  • 1996; 20(4): 601-610

    Published online Jul 25, 1996