TY - JOUR
T1 - Copolymerization kinetics of a model siloxane system
AU - Rankin, Stephen E.
AU - Macosko, Christopher W.
AU - Mccormick, Alon V.
PY - 1997/5
Y1 - 1997/5
N2 - 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.
AB - 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.
KW - Hydrolysis
KW - Methylethoxysilanes
KW - Modeling
KW - Polycondensation
KW - Sol-gel
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U2 - 10.1002/(SICI)1099-0518(199705)35:7<1293::AID-POLA15>3.0.CO;2-3
DO - 10.1002/(SICI)1099-0518(199705)35:7<1293::AID-POLA15>3.0.CO;2-3
M3 - Article
AN - SCOPUS:0031139237
SN - 0887-624X
VL - 35
SP - 1293
EP - 1302
JO - Journal of Polymer Science, Part A: Polymer Chemistry
JF - Journal of Polymer Science, Part A: Polymer Chemistry
IS - 7
ER -