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Accession Number:
AD0275501
Title:
SYNTHESIS OF ORGANOMETALLIC POLYMERS
Descriptive Note:
Corporate Author:
NAVAL APPLIED SCIENCE LAB BROOKLYN N Y
Report Date:
1962-05-08
Pagination or Media Count:
1.0
Abstract:
In connection with a program to synthesize new siloxane polymers with superior resistance to attack by heat, studies were undertaken to determine the molecular structure of a thermally resistant resinous product obtained from Ph3SiOH and AlCl3, which showed a weight loss of only 9 when heated to 500 C at a rate of 180 Chr. Efforts were also made to obtain information about the reaction mechanism. Results indicate that the material is probably a branched open-chain silicone polymer with attached cyclic siloxane trimer groups. Such materials are more thermally stable than siloxanes with only open-chain or non-cyclic branched molecular configurations. When the polymer is crosslinked through phenyl-silicon bond cleavage and transfer reactions, the thermal resistance is markedly reduced. The course of the catalytic polymer reaction involves a partial scission of the phenyl g oups bonded to the central Si atom, accompanied by a redistribution of groups, to form siloxane polymers of branched structure with attached cyclic trimer units. Exploratory studies were initiated to synthesize open-chain copolymers with SiO and M-O backbone units and branches consisting of Si-O and M-O cyclic rimer groups. Under similar catalysis conditions, Ph3SnOH is disproportionated to give Ph2SnOn and Ph4Sn. Author
Distribution Statement:
APPROVED FOR PUBLIC RELEASE