Abstract
Carbonate monomers, such as 1,4-bis(cyclohexyloxycarbonyloxylmethyl)-benzene and related compounds were synthesized from potassium cyclohexanolate, CO2, and α,ω-dibromo compounds in the presence of 18-crown-6 ether in aprotic solvents. Poly(p-xylylidene) was found to be formed in addition to the carbonate monomer when all the substances were simultaneously introduced into the reaction mixture. By an appropriate reaction method and conditions the formation of by-products was eliminated, thus permitting the main product 1,4-bis(cyclohexyloxycarbonyloxymethyl)benzene to be obtained in a yield higher than 90% with respect to the p-xylylene α,ω-dibromide introduced. The carbonate monomer thus obtained was then used in transesterification with diols or diphenols, and also in an ester exchange reaction to form the corresponding polycarbonates. The polycarbonates obtained were characterized and their reduced viscosity was determined.
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Rokicki, G., Pogorzelska-Marciniak, B. & Kuran, W. A New Two-Step Method for Synthesis of Polycarbonates. Polym J 14, 847–854 (1982). https://doi.org/10.1295/polymj.14.847
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DOI: https://doi.org/10.1295/polymj.14.847
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