Abstract
Poly(tetramethyldisiloxaneethynylenephenyleneethynylene) resins were synthesized by polycondensation reactions of the bismagnesium derivative of p- or m-diethynylbenzene with 1,3-dichlorotetramethyldisiloxane. The molecular weights of the resins were determined by gel permeation chromatography. The structures of the resins were verified by 1H, 13C, and 29Si NMR as well as FT-IR spectroscopy. The thermal behavior of the resins was traced by differential scanning calorimetry (DSC). The resins can be thermally crosslinked through the acetylene groups to produce highly crosslinked resins which were thermally stable up to 539 °C in both nitrogen and air. Hard, black, and glassy ceramics were obtained after the sinter of the crosslinked resins at 1,450 °C. The polymers have a potential application as matrix materials for advanced composites and ceramic precursors.
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