Elastomer synthesis kinetics

The synthesis and phase behavior of the model polydiethylsiloxane networks have also been studied. The networks were made by hydrosilylation of well-defined vinyl and allyl telechelic siloxanes obtained by kinetically controlled polymerization of cyclic trisiloxane.314 The effects of molecular weight between the cross-linkings on segment orientation in polydiethylsiloxane elastomers were studied.315... 

De Sarkar, M., De, P.P., Bhowmick A.K, (1997). Thermoplastic elastomeric hydrogenated styrene-butadiene elastomers Optimization of reaction conditions, thermodynamics and kinetics. Journal of Applied Polymer Science, Vol.66, No. 6, p>p. 1151-1162 Dresselhaus, M., Dresselhaus, G., Avouris, Ph. (2001). Carbon Nanotubes. Synthesis, structure, properties and applications. Springer, ISBN 3-540-41086-4, Verlag Berlin Heidelberg, Germany... 

The accumulation of ARs during the interaction of PI with a mixture of NO and oxygen obeys other kinetic regularities. The presence of leads to the appearance of a certain induction period in the process. The ESR signal of PI exposed to the NO + mixture is similar to that shown in Figure 6.1a. In the absence of NO, the iminoxyl macroradicals formed in both cases are stable for many months in an inert atmosphere and in air. The proposed scheme of possible reactions of the radical formation in PI involves four main stages [7] (i) generation of alkyl macroradicals by the reaction of NO with elastomers (ii) synthesis of tertiary macromolecular nitroso compounds (iii) acceptance of tertiary alkyl or allyl macroradicals and (iv) decay of ARs. 

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