Accession Number : AD0294196

Title :   SYNTHESIS OF ELASTOMERS CONTAINING SI-N BONDS IN THE MAIN CHAIN

Corporate Author : MIDWEST RESEARCH INST KANSAS CITY MO

Personal Author(s) : BREED,L.W. ; ELLIOTT,R.L.

Report Date : 21 DEC 1962

Pagination or Media Count : 1

Abstract : Polymers containing silicon and nitrogen in the main chain with intrinsic viscosities (in toluene) up to 1.6 have been prepared by the condensation of hexamethylcyclotrisilazane with bisphenol A. When 4,4'-dihydroxyphenyl is used as the diol, polymers with improved thermal stability are obtained. The screening of various other monomer compositions is described. The great stability of small ring silicon-nitrogen compounds under the influence of acidic and basic catalysts is demonstrated in a variety of experiments; however, some conversion of octamethylcyclotetrasilazane to hexamethylcyclotrisilazane was observed at 175 degrees in the presence of aluminum or ferric chloride. (Author)

Descriptors :   *ELASTOMERS, *HEAT RESISTANT PLASTICS, *SILICON COMPOUNDS, AMIDES, AMMONIUM COMPOUNDS, CATALYSTS, CHALCOGENS, HETEROCYCLIC COMPOUNDS, HYDROLYSIS, NITRATES, NITROGEN COMPOUNDS, SODIUM COMPOUNDS, STABILITY, SULFONIC ACIDS, SYNTHESIS, THERMAL STRESSES, TOLUENES

Distribution Statement : APPROVED FOR PUBLIC RELEASE