Synthesis and Properties of Substituted Polyacetylenes Having Cyclohexyl Groups

摘要: Disubstituted acetylenes containing cyclohexyl groups (RC≡CC6H4–p-cyclo-C6H11, R=Ph, p-Me3SiPh, p-tert-BuMe2SiOPh, Me, Cl, 1a–e, respectively) were polymerized with Ta- or Mo-based catalyst, and 1a, 1c, 1e provided high molecular weight polymers. Free-standing membranes of poly(1a) poly(1c) fabricated from toluene solution. Hydroxy-containing membrane poly(2c) was prepared by desilylation siloxy-containing using trifluroacetic acid. According to thermogravimetric analysis (TGA), the produced polymers exhibited thermal stability, onset temperatures loss in air ∼340 °C. The oxygen permeability coefficients these range 17–230 barrers. point PCO2 vs. PCO2/PCH4 plot located above Robeson’s upper bound.