Copolymerization kinetics of a model siloxane system

Stephen E. Rankin, Chris Macosko, Alon V McCormick

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

Using 29Si NMR, we monitor the copolymerization of trimethylethoxysilane and dimethyldiethoxysilane (model compounds for more complex sol-gel copolymer systems) in a batch reactor. Under the chosen conditions, the extents of self- and cross-condensation reactions are readily determined. Using a nonideal polycondensation kinetic model, we show that the copolymerization rate coefficient for a pair of sites of differing functionality is bounded by their homopolymerization rate coefficients, lying closer to the larger one. This reactivity pattern generates a heterogeneous monomer distribution in the copolymerization products.

Original languageEnglish (US)
Pages (from-to)1293-1302
Number of pages10
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume35
Issue number7
DOIs
StatePublished - May 1997

Keywords

  • Hydrolysis
  • Methylethoxysilanes
  • Modeling
  • Polycondensation
  • Sol-gel

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