Copolymerization kinetics of a model siloxane system

Stephen E. Rankin, Christopher W. Macosko, Alon V. Mccormick

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


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


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

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry


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