Silarylene-siloxane diacetylene polymer

Finally, silarylene-siloxane-diacetylene polymers were reported by Hom-righausen and KeUer in 2000 [28], as precursors to high temperatiue elastomers. They were obtained as follows ... 

Figure 15.15 Structure of the elastomeric diacetylene-diluted silarylene-siloxane-diacetylene polymer reported by Homrighausen et al.

The synthesis of block polymers of diacetylene-silarylene and diacetylene-carboranylenesiloxane polymers (99a-e) (Fig. 61) by the polycondensation reaction of 1,4-dilithiobutadiyne with l,4-bis(dimethylchlorosilyl) benzene and/or l,7-bis(tetramethylchlorodisiloxane)-m-carborane have been reported by Sundar and Keller.129 These polymers are a hybrid between the carboranylenesiloxane and silarylene-siloxane polymers and have high char yields (up to 85%) at 1000°C in N2 and in air, reflecting the thermal stabilizing effects of the carborane and aromatic units in the polymeric backbone. 

Silarylene-Siloxane Polymers Containing Thermally Crosslinkable or Vulcanizable Diacetylene Groups... 

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