Effect of gamma-ray irradiation on isothermal crystallization of biodegradable poly(ethylene succinate)

Yu Fan Chuang, Yu Cheng Chou, Fuqian Yang, Sanboh Lee

Research output: Contribution to journalArticlepeer-review

Abstract

The effects of gamma-ray irradiation on the isothermal crystallization of biodegradable poly(ethylene succinate) (PESu) and the growth behavior of PESu spherulites have been studied by differential scanning calorimetry and polarized optical microscopy. The irradiation doses used in the study are 0, 200, 400, and 600 kGy. The kinetic parameters for the isothermal crystallization have been determined, using the Avrami relationship. The nucleation constants and activation energy for the growth of the PESu spherulites have been analyzed, using the Lauritzen-Hoffman growth theory. Triple melting points have been observed for all the irradiated PESu. The gamma irradiation has no observable effect on the Avrami exponent, and the composite rate constant increases first with the increase of the crystallization temperature, reaches maximum at the crystallization temperature of ~35 °C, and then decreases with the increase of the crystallization temperature for both the non-irradiated and irradiated PESu. There exists a transition of the growth of the PESu spherulites from regime II to regime III. Both the nucleation constants and activation energy increase with increasing the irradiation dose. The gamma irradiation increases the energy barrier for the migration of polymer chains.

Original languageEnglish
Pages (from-to)2615-2631
Number of pages17
JournalPhilosophical Magazine
Volume96
Issue number25
DOIs
StatePublished - Sep 1 2016

Keywords

  • Gamma irradiation
  • growth kinetics
  • isothermal crystallization
  • poly(ethylene succinate)

ASJC Scopus subject areas

  • Condensed Matter Physics

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