Hydrogen-terminated siloxane, reaction

Synthesis of comb (regular graft) copolymers having a PDMS backbone and polyethylene oxide) teeth was reported 344). These copolymers were obtained by the reaction of poly(hydrogen,methyl)siloxane and monohydroxy-terminated polyethylene oxide) in benzene or toluene solution using triethylamine as catalyst. All the polymers obtained were reported to be liquids at room temperature. The copolymers were then thermally crosslinked at 150 °C. Conductivities of the lithium salts of the copolymers and the networks were determined. 

Vinyl-terminated polydimethyl siloxanes react with hydrogen silanes according to second order kinetics. The same kinetics are found in model reactions on monofunctional reactants at a lower concentration range. Also, a direct proportionality between the rate of reaction and platinum concentration is observed in both cases. Network formation does not inhibit the reaction. Polymers with lateral vinyl groups and very short chain polymers with vinyl end groups have q)proximately zero order kinetics with... 

Figure 37 shows the chemical structures of the ferroelectric side group precursor 39 with a terminal double bond and the copolymer 40. obtained by the hydrosilylation reaction between 39 and the copoly (methyl-hydrogen siloxane) together with the phase-transition temperatures for 39, 40. and the homopolymer 18. The temperature range of the Sc phase for both polymers is 120 K, thus considerable enhanced compared with the side group precursor 39, which has only a 40-K-wide Sr range. The Sr phase of the copolymer is extended to room temperature. 

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