Structural formation of poly(ethylene terephthalate) during the induction period of crystallization: 2. Kinetic analysis based on the theories of phase separation

M. Imai, K. Mori, T. Mizukami, K. Kaji, T. Kanaya

研究成果: Article査読

113 被引用数 (Scopus)

抄録

Crystallization processes of poly(ethylene terephthalate) (PET) when annealed at 80°C, or 5°C above the glass transition temperature, Tg, have been investigated by a small-angle X-ray scattering (SAXS) technique. At a very early stage of annealing, a scattering maximum appears at around Q = 0.04 A ̊-1, where Q is the length of the scattering vector (Q = 4π sin θ/λ). During the so-called induction period of crystallization, this maximum intensity increases with annealing time and the maximum position shifts towards the low Q side. These results confirm the previously reported new finding that the long-range ordered structure is formed in the induction period before crystallization. These ordering processes can be divided into two stages: an early and a late stage. The scattering behaviour in the early stage is in accordance with the prediction of Cahn's linearized theory for spinodal decomposition. The scattering profiles in the late stage can be described in terms of Furukawa's scaling theory for the cluster growth regime. From these experimental results, we conclude that the growth process of the density fluctuation occurs in the induction period and this process is very similar to the spinodal decomposition type of phase separation process. It is considered that after this dense domain grows to a certain size, crystallization begins.

本文言語English
ページ(範囲)4457-4462
ページ数6
ジャーナルPolymer
33
21
DOI
出版ステータスPublished - 1992
外部発表はい

ASJC Scopus subject areas

  • 有機化学
  • ポリマーおよびプラスチック
  • 材料化学

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