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Ultrahigh molecular weight aromatic siloxane polymersThe condensation of a diol with a silane in toluene yields a silphenylene-siloxane polymer. The reaction of stiochiometric amounts of the diol and silane produced products with molecular weights in the range 2.0 - 6.0 x 10 to the 5th power. The molecular weight of the product was greatly increased by a multistep technique. The methodology for synthesis of high molecular weight polymers using a two step procedure was refined. Polymers with weight average molecular weights in excess of 1.0 x 10 to the 6th power produced by this method. Two more reactive silanes, bis(pyrrolidinyl)dimethylsilane and bis(gamma butyrolactam)dimethylsilane, are compared with the dimethyleminodimethylsilane in ability to advance the molecular weight of the prepolymer. The polymers produced are characterized by intrinsic viscosity in tetrahydrofuran. Weight and number average molecular weights and polydispersity are determined by gel permeation chromatography.
Document ID
19830009113
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ludwick, L. M.
(Tuskegee Inst. AL, United States)
Date Acquired
August 11, 2013
Publication Date
August 1, 1982
Publication Information
Publication: NASA. Marshall Space Flight Center The 1982 NASA(ASEE Summer Fac. Fellowship Program
Subject Category
Nonmetallic Materials
Accession Number
83N17384
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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