By Nodar Lekishvili, Victor Kopylov, Gennady Zaikov
Read or Download Silicon-Organic Oligomers and Polymers With Inorganic and Organic-Inorganic Main Chains (Polymer Science and Technology) PDF
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Extra info for Silicon-Organic Oligomers and Polymers With Inorganic and Organic-Inorganic Main Chains (Polymer Science and Technology)
The reaction trans-amination is less probable due to the low intermediate concentration of the Si-NH2-groups and the higher activation energy, Ea compared with the reaction of the hetero-functional polycondensation . It should be noted that it is possible some deviation from the “ideal” scheme of the reaction of bisphenol with SiNHSi-bonds of the propagating chain. However, to take this into account is very difficult at solving the calculation tasks.
For the reaction of cis-A3 with TMPS-Ti, the presence of the Ti- atom in the molecule of the latter seems to be of considerable importable bue to its ability as an initiator. The formation of the polymer with low MM in the case of TMPS-Ti, when the content of the latter is not great, demonstrates that cutting of the polymer occurs due to consumption of the Ti- containing component . This suggestion can be substantiated by the data from Reference 32, where the reactions of tetramethylcyclotetrasiloxane (D4) with boric acid as well as with its ethers were studied.
6 dl/g after the same period of treatment. The physical and chemical characteristics of rubber obtained from synthesized polymers and subject to thermal ageing are superior to those of rubber obtained from industrial rubber polydimethyl(siloxane, since the rubber obtained by polymerization polycondensation of dihydroxypolydimethyl (methylvinyl)siloxanes with dimethylcyclosilazanes without acid or alkaline catalysts, is naturally free of the latter which usually deteriorate the thermal stability of rubber.