Abstract
New crosslinked polycarbosilanes (PCSs) having biphenyl, biphenyl ether and naphthalene linkages, were synthesized by hydrosilylation reaction between multi-functional vinylsilanes and hydrosilanes. The PCSs were transparent rigid material without cracks or bubbles. The mechanical properties and glass transition temperatures (T g s) of the PCSs were evaluated by flexural tests and differential scanning calorimeter (DSC) or dynamic mechanical analysis (DMA). Crosslinked PCSs VIII-X with high network chain density and rigid-rod spacers had T g s at around 250°C and high flexural strength in the range of 75-96 MPa. 5% weight loss temperatures of PCSs under nitrogen ranged from 490°C to 544°C.
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