Article
  • Competitive Phase Separation in a Crystallizable Polymer Solution
  • Lee HK, Levon K
  • 결정성 고분자를 포함하는 용액에서의 경쟁적 상분리
  • 이환광, Levon K
Abstract
The structure formation by liquid-liquid(L-L) phase separation coupled with crystallization in isotactic polypropylene(i-PP) solutions was investigated by temperature-jump experiment. A series of dialkyl phthalates with a different number of carbon atoms in the alkyl chain was used to control the interaction between polymer and solvent. Various thermal quench conditions were applied to the i-PP solutions to control systematically L-L phase separation and crystallzation. A slow crystallization elongates the liquid droplets in the radial direction of a spherulite. A rapid crystallization under the deep quench locks-in the growth of L-L phase separation. These results indicate that the extent of L-L phase separation which exists below melting point can be successfully controlled through the proper selection of solvent and thermal conditions.

i-PP 용액에서 액-액상분리 및 결정화의 경쟁적 발생에 의한 구조형성을 온도 급강하 실험을 통하여 연구하였다. 고분자와 용매 사이의 상호작용을 조절하기 위하여 알킬사슬에서 탄소원자의 개수가 다른 dialkyl phthalate를 사용하였다. 액-액상분리와 결정화를 체계적으로 조절하기 위하여 i-PP 용액에 다양한 냉각조건을 적용시켰다. 결정화 속노가 느리면 형성되는 액적은 구정의 성장방향으로 잡아 늘려진다. 낮은 온도로 급냉시켰을 경우 액-액상분리의 성장은 빠른 속도로 진행되는 결정화에 의하여 멈춰진다. 실험결과로부터 용매 및 온도조건을 적합하게 선정하면 융점 이하에 존재하는 액-액상분리의 진행정도를 성공적으로 조절할 수 있음이 밝혀졌다.

Keywords: liquid-liquid phase separation; crystallization; competitive phase separation; isotactic polypropylene solution

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2023 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 1997; 21(2): 241-251

    Published online Mar 25, 1997