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H. Matsuda


Chain extension of partially neutralized carboxyl-terminated liquid rubbers with epoxy resin


Polimery 1982, No 8, 285



DOI: dx.doi.org/10.14314/polimery.1982.285

Summary

Chain extension of partially neutralized carboxyl-terminated liquid rubbers (PNCTLER) with epoxy resin (bisphenol A diglycidyl ether) was investigated by the carboxyl-epoxide reaction to form a hydroxyalkyl ester. The PNCTLR were prepared, by the partial neutralization with MgO and CaO, from a polymer of butadiene (Hycar CTB 2000X162) and copolymers of butadiene - acrylonitrile (Hycar CTBN 1300X8 and CTBNX 1300X9). The metal carboxylate groups in PNCTLR catalyzed the reaction and, further, the Mg carboxylate group showed higher catalytic activity than the Ca carboxylate group. The chain-extended CTBN - and CTBNX - series rubbers obtained showed better physical properties than the CTB -series, because of a polarity effect of nitrile groups in the former. In addition, Mg was more effective than Ca in improving tensile strength. Among them, the CTBNX-series showed the highest strength due to the highest functionality (= 2.4) of original CTBNX 1300X9. For these rubbers, carbon black showed remarkable reinforcing effects. Stress relaxation and water absorption are also discussed.


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