Structural formation of poly (ethylene terephthalate) during the induction period of crystallization: 1. Ordered structure appearing before crystal nucleation

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

Research output: Contribution to journalArticlepeer-review

186 Citations (Scopus)

Abstract

A new finding is reported concerning some structural change in the amorphous state of the polymer which occurs during the so-called induction period before the start of crystallization. Annealing of poly(ethylene terephthalate) (PET) at 115°C, or 40°C above the glass transition temperature, Tg, has been investigated by small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS) techniques. At a very early stage of the induction period the SAXS intensity starts to increase in the range of Q = 0.02-0.04 A ̊-1, where Q is the length of the scattering vector (Q = 4π sin θ/λ), and continues to increase until the beginning of crystallization. Corresponding to the initation of crystallization, another strong peak, caused by the usual long-period structure, appears in the vicinity of Q = 0.05 A ̊-1. It is confirmed from the WAXS measurements that no local ordering takes place during the induction period. To clarify the crystallization process, distance distribution analysis is also carried out.

Original languageEnglish
Pages (from-to)4451-4456
Number of pages6
JournalPolymer
Volume33
Issue number21
DOIs
Publication statusPublished - 1992 Jan 1
Externally publishedYes

Keywords

  • crystallization
  • distance distribution analysis
  • induction period
  • poly(ethylene terephthalate)
  • small-angle X-ray scattering
  • structural formation
  • wide-angle X-ray scattering

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Structural formation of poly (ethylene terephthalate) during the induction period of crystallization: 1. Ordered structure appearing before crystal nucleation'. Together they form a unique fingerprint.

Cite this