Degradation and relaxation kinetics of polystyrene-clay nanocomposite prepared by surface initiated polymerization

Sergey Vyazovkin, Ion Dranca, Xiaowu Fan, Rigoberto Advincula

Research output: Contribution to journalArticle

82 Citations (Scopus)

Abstract

Thermogravimetry and differential scanning calorimetry (DSC) have been used to study the thermal and thermo-oxidative degradation of polystyrene (PS) and PS-clay nanocomposite. An advanced isoconversional method has been applied for kinetic analysis. Introduction of the clay phase increases the activation energy and affects the total heat of degradation that suggests a change in the reaction mechanism. The obtained kinetic data permit comparative assessment of fire resistance of the studied materials. Relaxation kinetics have been measured by DSC and dynamic mechanical analysis. As compared to virgin PS, the clay nanocomposite shows the glass transition at a higher temperature and demonstrates markedly larger activation energy. This suggests that the clay phase lowers the molecular mobility of PS which is another factor contributing to the increased thermal stability of the nanocomposite.

Original languageEnglish
Pages (from-to)11672-11679
Number of pages8
JournalJournal of Physical Chemistry B
Volume108
Issue number31
DOIs
Publication statusPublished - 2004 Aug 5
Externally publishedYes

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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