• Solvent Induced Crystallization of Polycarbonate in Mixed Solvent
  • Hwang DK, Lee CY, Shul YG
  • 혼합용매에 의한 Polycarbonate 의 결정화
  • 황덕근, 이창엽, 설용건
Abstract
Crystallization behaviour of bisphenol A polycarbonate(PC) from amorphous phase was studied by varing solvent/nonsolvent ratios in liquid phase. Chloroform and isopropanol were used as a solvent and a nonsolvent, respectively. Samples were characterized by optical microphotography, scanning electron microscope(SEM), X-ray diffaction (XRD), and differencial scanning calorimeter(DSC). DSC and XRD measurement were used to determine the crystallinity of PC. The solubility constant seems to critical to control the PC crystallinity in solvent/nonsolvent mixture. The difference in PC crystallinity is explained by the difference in solubility constant of the mixture depending on the solvent/nonsolvent ratio. PC solution of 75/25 wt% (solvent/nonsolvent) ratio produced PC powder showing maximum crystallinity. At this condition solubility constant (9.85) of the mixed solvent was close to PC(9.9).

용매와 비용매의 다양한 비율에 따라서 bisphenol A polycarbonate(PC)의 무정형에서 결정성의 상변화를 확인하였다. 용매로 chloroform을, 비용매로 isopropanol을 사용하였다. 결정화된 PC는 광학현미경과 SEM, XRD, DSC를 이용하여 조사하였고, DSC와 XRD의 측정값은 PC의 결정화도를 판단하는데 이용하였다. 용해도 상수는 PC의 결정화도를 조절하는데 중요한 인자로 PC 결정화도 차이는 혼합용매의 용해도 상수 차이로 설명하였다. 용매와 비용매 비율이 75/25 wt%의 PC 용액에서 고결정화도를 가진 PC powder로 얻을 수 있었다. 이런 결과는 혼합용매의 용해도 상수(9.85)가 PC의 용해도 상수(9.9)와 유사하였기 때문이라고 판단된다.

Keywords: polycarbonate; crystalline; amorphous; solubility parameter

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2024 Impact Factor : 0.6
  • Indexed in SCIE

This Article

  • 2001; 25(6): 811-817

    Published online Nov 25, 2001

  • Received on Dec 9, 2000