Viscoelastic and morphological behavior of hybrid styryl-based polyhedral oligomeric silsesquioxane (POSS) copolymers

A. Romo-Uribe, P. T. Mather, T. S. Haddad, J. D. Lichtenhan

Research output: Contribution to journalArticle

275 Scopus citations

Abstract

We report on the viscoelastic behavior of linear thermoplastic nonpolar hybrid inorganic-organic polymers. These materials have been synthesized through copolymerization of an oligomeric inorganic macromer with 4-methylstyrene where the inorganic portion of the material is a well-defined polyhedral oligosilsesquioxane (POSS), R7(Si8O12)(CH2CH2C 6H4CH=CH2), with R = c-C6H11. or c-C5H9. A series of 4-methyl styrene copolymers with approximately 4, 8, and 16 mol % POSS macromer incorporation were investigated. Rheological measurements show that the polymer dynamics are profoundly affected as the percent of POSS increases. In particular a high-temperature rubbery plateau develops (where a terminal zone is not observed) despite the fact that the parent poly 4-methylstyrene is unentangled. It is also observed that the thermal properties are influenced as the percent of POSS incorporation increases with increases in the glass and decomposition temperatures. The results suggest that interchain interactions between the massive inorganic groups are responsible for the retardation of polymer chain motion, a mechanism similar to the "sticky reptation" model conceived for hydrogen-bonded elastomers and developed by Leibler et al. [Macromolecules, 24, 4701 (1991)]. Control over the interchain interactions would also give rise to the observed increases in glass transition and the establishment of a rubbery plateau.

Original languageEnglish (US)
Pages (from-to)1857-1872
Number of pages16
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume36
Issue number11
DOIs
StatePublished - Aug 1998

Keywords

  • Hybrid polymers
  • Reptation
  • Rheology
  • Silsesquioxane polymers

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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