Abstract
The ring-opening copolymerization of epoxides with cyclic acid anhydrides was found to be initiated by carbon black containing potassium carboxylate (COOK) groups to give alternating polymers, i.e., polyesters. Polyesters were propagated from COOK groups and effectively grafted on carbon black; for example, the grafting ratios of polyesters from glycidyl methacrylate and succinic anhydride and from styrene oxide and maleic anhydride were 126.2 and 51.5%, respectively. The rate of copolymerization increased with increasing temperature, whereas the grafting ratio of polyesters decreased. The initiating activity of alkali metal carboxylate groups increased, depending on the type of alkali metal countercations, in the following order: COOLi < COONa < COOK < COORb < COOCs. This order was in agreement with that of increasing electropositivity of the countercations. In addition, the increasing electropositivity of the counter-cation caused an increase in the rate of chain transfer reaction, leading to a decrease in the grafting ratio and molecular weight of ungrafted polyesters. The effects of solvent on the copolymerization and grafting ratio are discussed.
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Tsubokawa, N., Yamada, A. & Sone, Y. Grafting of Polyesters on Carbon Black V. Preparation of Polyester-Grafted Carbon Black with a Higher Grafting Ratio by the Copolymerization of Epoxide with Cyclic Acid Anhydrides Using COOK Groups on Carbon Black as the Initiator. Polym J 16, 333–340 (1984). https://doi.org/10.1295/polymj.16.333
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DOI: https://doi.org/10.1295/polymj.16.333