Article
  • Crystallization Kinetics of Polypropylene in the Presence of a Nucleating Agent
  • Kim CK, Myoung HS
  • 핵제첨가 Polypropylene의 결정화 속도에 관한 연구
  • 김척기, 명희수
Abstract
Crystallization kinetics of polypropylene(PP), containing bis-(p-ethyl) benzylidene sorbitol as a nucleating agent, was observed. Isothemal crystallization rate was measured by depolarized light intensity method. As crystallization was continued Avrami exponent was decreased. Avrami exponent of pure PP, not containing nucleating agent, was 2.8∼4.0 which showed three dimensional spherulitic growth. In case of nucleated PP, Avrami exponent was 4.0∼5.5 at early stage of crystallization and high degree of supercooled temperature, and second crystallization was observed clearly.

기핵제로서 bis-(p-ethyl) benzylidene sorbitol을 첨가한 폴리푸로필렌의 결정화속도를 관찰하였다. 탈편광강도법을 이용하여 결정화동력학을 관찰한 결과 Avrami 지수는 결정화가 진행함에 따라 감소하였다. 핵제를 첨가하지 않은 폴리푸로필렌은 Avrami 지수가 2.8∼4.0으로 3차원 구정 성장 양식을 나타냈으며 핵제를 첨가한 폴리푸로필렌은 결정화 초기부분과 과냉각도가 큰 온도에서 4∼5.5의 Avrami 지수를 나타내었고 2차 결정화가 뚜렷하게 관찰되었다.

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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

  • 1991; 15(3): 235-241

    Published online Jun 25, 1991