• Melt and Recrystallization Behavior of Syndiotactic Polypropylene and Isotactic Polypropylene
  • Lee SW, Huh W, Hyun U, Lee D, Noh SK
  • 신디오택틱 폴리프로필렌과 아이소택틱 폴리프로필렌의 용융과 재결정화
  • 이상원, 허완수, 현욱, 이동호, 노석균
Abstract
It was found that polypropylene shows rearrangement of crystal structure during the melting process. For the analysis of recrystallization behavior, the change of dynamic mechanical property, crystallinity, and crystal structure were studied by DSC, FT-IR, SAXS, and DMA. Melt-recrystallization-remelting behavior of iPP was clearly observed when iPP was cooled down from the melt more rapidly. Elastic modulus of iPP increased during the recrystallization process but crystallinity of iPP shows constant value. Furthermore, the full width of half mean of SAXS pattern decreased about 30%, and intra-lamella ordering of iPP increased during the melt process but is was not found for sPP.

신디오택틱 폴리프로필렌 (sPP)과 아이소택틱 폴리프로필렌 (iPP)은 용융과정에서 결정의 재배열이 나타나며 이와 같은 재결정 현상을 해석하기 위하여 결정화도와 결정구조의 변화, 동역학적 물성을 고찰하였고 DSC, FT-IR, SAXS, DMA를 이용하였다. 본 연구에서 실험된 조건에서는 sPP의 재결정화 현상을 확인할 수 없었으며, iPP는 용융으로부터 냉각되는 속도가 빠르게 될 수록 재가열시 재결정화 현상이 두드러졌다. iPP의 재결정화가 진행되는 동안 tan δ가 0.119에서 0.101로 감소하여 탄성율이 증가한 결과를 보이나 결정화도는 거의 일정하게 유지되었다. 더욱이 재결정 현상이 진행되는 동안 SAXS 산란피크의 반가폭이 약 30% 감소하여 라멜라의 질서가 증가하는 거동을 보였다.

Keywords: polypropylene; recrystallization; SAXS; lamella

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This Article

  • 2003; 27(6): 521-527

    Published online Nov 25, 2003

  • Received on Jan 26, 2002
  • Accepted on Sep 8, 2003