Effect of carboxyl on vulcanization and mechanical properties of carboxylated acrylic rubber prepared by ⁶⁰Co‐γ‐ray‐induced polymerization

Abstract

Acrylic acid carboxylated acrylic rubber (ACM) and itaconic acid carboxylated acrylic rubber were prepared by 60 Co-g-ray-induced emulsion copolymerization. The polymers were characterized using FTIR and 13 C NMR spectroscopies. The acid value was determined with nonaqueous titration method. The molecular weight and the polydispersity index of the polymers were measured using gel permeation chromatography. The influence of the cure-site (carboxyl) on the vulcanization and mechanical properties of the ACM was researched by means of rheometric study, gel fraction analysis, mechanical property tests, and dynamic mechanical thermal analysis. The results show that the crosslink density of polymers increases with amounts of the carboxyl cure-site. The itaconic acid carboxylated ACM has better cure characteristics and mechanical properties than the acrylic acid carboxylated ACM has. In addition, the comparison of ACM prepared by 60 Co-g-ray-induced polymerization with ACM prepared by chemical-initiator-induced polymerization has been investigated.

Surface modification of nylon 66 fiber and its reinforcement of coordination crosslinked acrylic rubber

“…), its main chain is saturated carbon chain, and the side group is polar ester group. Due to its special structure, it has excellent heat resistance, oil resistance, aging resistance, ozone resistance, compression permanent deformation, and so forth, which make it widely used in high temperature oil seals with operating temperatures up to 150 $ 200 C. [1][2][3][4] However, the mechanical properties of AR are poor and not as good as most of synthetic rubbers. Especially in the case of scratches and cracks, it is easy to break or tear, which limits its applications in tire and conveyor belt.…”

Characterization and study of the vulcanization characteristics of ultra‐cold‐resistant reactive chlorinated acrylic rubber prepared by emulsion polymerization

“…Recently, Zhicheng Zhang's team reported the preparation of ACM using 60 Co-γ-ray-induced polymerization. 9,10 Ordinary acrylic rubber can withstand a high temperature of 170 °C and a low temperature of −30 °C. In this study, an acrylic rubber was designed to withstand a low temperature of −35 °C and a high temperature of 175 °C, which is an improvement over the low-temperature performance of general ACM.…”

“…At present, with the improvement of the requirements of the automobile and machinery industries, rubber products must be oil‐resistant, high‐temperature‐resistant and low‐temperature‐resistant. Recently, Zhicheng Zhang's team reported the preparation of ACM using 60 Co‐γ‐ray‐induced polymerization 9,10 …”