Accession Number:

AD0275501

Title:

SYNTHESIS OF ORGANOMETALLIC POLYMERS

Descriptive Note:

Corporate Author:

NAVAL APPLIED SCIENCE LAB BROOKLYN N Y

Personal Author(s):

• DELMAN,A.D.
• KATZENSTEIN,R.J.
• RUFF,A.E.

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

Descriptors:

• *HEAT RESISTANT PLASTICS
• *ORGANOMETALLIC COMPOUNDS
• *SILICONES
• ALCOHOLS
• ALUMINUM COMPOUNDS
• CHEMICAL BONDS
• CHLORIDES
• ELASTOMERS
• HYDROXIDES
• MOLECULAR STRUCTURE
• PHENYL RADICALS
• POLYMERS
• SILICON COMPOUNDS
• SYNTHESIS
• TIN COMPOUNDS

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE