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 language | English |
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Pages (from-to) | 1293-1302 |
Number of pages | 10 |
Journal | Journal of Polymer Science Part A: Polymer Chemistry |
Volume | 35 |
Issue number | 7 |
DOIs | |
State | Published - May 1997 |
Keywords
- Hydrolysis
- Methylethoxysilanes
- Modeling
- Polycondensation
- Sol-gel
ASJC Scopus subject areas
- Polymers and Plastics
- Organic Chemistry
- Materials Chemistry