Preparation, characteristics and structural elements of new heat-melting silicone resins
Polimery 1994, No 9, 519
The method of synthesis of heat-melting silicon resins from phenyltrichlorosilane (FTS) or from a mixture of FTS with diphenyldichlorosilane (DFDS) has been developed. Thus, either FTS partially esterified with cyclohexanol or a mixtureof FTS and DFDS was subjected to hydrolytic polycondensation by the method of "reversed hydrolysis" in the presence of hydrated sodium or kalium carbonates. Some physicochemical properties of these resins (elemental composition, number average molecular weight, and softening temperature) were determined as well as the results of their characterization by the methods of IR- and 1H-NMR-spectroscopy and derivatography were presented. Basing on these data, the evaluation of the structural elements and of the possible overall structure of the resins was attempted. It was concluded from comparison with the thermosetting silicon resins that the heat-melting silicon resins under study do not contain structural elements characteristic of thermosetting resins and that they possess a cyclic-linear structure.
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