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Modified Synthesis of Polysilanes

IP.com Disclosure Number: IPCOM000043427D
Original Publication Date: 1984-Aug-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

McKean, DR: AUTHOR [+2]

Abstract

A new synthetic procedure and a new casting solvent system give lower molecular weight, highly soluble, gel-free polysilanes often in greatly increased yields. The polymer solutions, in the newly discovered casting solvent, are easily filterable and seen to be stable indefinitely. These new procedures are particularly significant with respect to the preparation of polycyclohexylmethylsilane. In this regard, the reaction of dichlorocyclohexylmethylsilane with exactly 2.0 equivalents of sodium dispersion in a 3:1 toluene/diglyme solvent system gives a 36% yield of gel-free polymer with Mw = 29.9K. Likewise, the reaction of dichloromethylphenylsilane with 2.0 equivalents of Na in toluene/diglyme results in gel-free polymethylphenylsilane of Mw = 18.7K.

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Modified Synthesis of Polysilanes

A new synthetic procedure and a new casting solvent system give lower molecular weight, highly soluble, gel-free polysilanes often in greatly increased yields. The polymer solutions, in the newly discovered casting solvent, are easily filterable and seen to be stable indefinitely. These new procedures are particularly significant with respect to the preparation of polycyclohexylmethylsilane. In this regard, the reaction of dichlorocyclohexylmethylsilane with exactly 2.0 equivalents of sodium dispersion in a 3:1 toluene/diglyme solvent system gives a 36% yield of gel-free polymer with Mw = 29.9K. Likewise, the reaction of dichloromethylphenylsilane with 2.0 equivalents of Na in toluene/diglyme results in gel-free polymethylphenylsilane of Mw = 18.7K. Both of these low molecular weight polymers are readily dissolved in a casting solvent consisting of 3:1 toluene/ethylcyclohexane mixture. The solutions are easily filtered through millipore devices and seem to be indefinitely stable at room temperature. When cast into films, the lower molecular weight materials have lithographic properties comparable to the higher molecular weight samples.

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