β to α form transition observed in the crystalline structures of syndiotactic polystyrene (sPS)

Tetsu Ouchi, Suguru Nagasaka, Atsushi Hotta

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

A solid-solid crystalline transition from β to α forms in syndiotactic polystyrene (sPS) was found during the mechanical deformation in the temperature range of 130-218 °C, studied by X-ray and infrared spectroscopy. α and β forms, in contrast to the other two crystalline structures (γ and δ forms) in sPS, are two major crystalline forms manufactured through a concise molding process which is industrially readily accessible. There have been a number of structural transitions found between two crystalline structures among the four different crystalline forms of sPS. In this work, β to α form transition at well below the melting temperature of sPS (∼270 °C) was found by mechanical deformation, which became more pronounced as temperature increased. The structural transition was intimately related to the crystallization temperature and the densities of α and β forms.

Original languageEnglish
Pages (from-to)2112-2119
Number of pages8
JournalMacromolecules
Volume44
Issue number7
DOIs
Publication statusPublished - 2011 Apr 12

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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