The Structure And Performance Study Of Brominated Butyl Rubber

Brominated isobutylene rubber (BⅡR) has promising applications in protective materials, radial tire and medical sealing materials for its good gas permeability, the fast vulcanization speed, blending with other rubbers easily, good cold, heat, aging and chemical resistance.In this paper, Br contents, Mooney viscosity and thermal stability of five different types of BⅡR including Chinese BⅡR (BIIR-C) and four foreign types of BⅡR were characterized, the cure characteristics, mechanical properties, thermal stability and cold resistance of BⅡR compounds were also investigated. To satisfy the performance requirements of mask cover materials, the reinforcing system, plasticizing system and curing system of BⅡR were optimized designed. In addition, the optimized ratio of BⅡR and chlorinated isobutylene rubber (CIIR) and the effect of graphene oxide (GO) contents on the performance of BⅡR composites were researched. The results showed that during five types of BⅡR, BIIR-C had a least menc, lower Br contents, good tensile strength and poor tear strength, which was similar to BⅡR2211and BⅡR2222, and between BIIR2030and BIIR2255. The optimized ratio of BⅡR and CⅡR was80:20. Under the optimal formulation, BⅡR-C, BⅡR2222, BⅡR-C/CIIR (80/20) and BⅡR2222/CⅡR (80/20) vulcanizates all reached the performance requirements of mask cover materials. The results also indicated that GO nanosheets had a great effect on the mechanical properties, thermal stability and thermal conductivity of GO/BIIR vulcanizates. GO nanosheets largely enhanced the modulus of BⅡR, especially M300, M500and M900. With the incorporation of GO nanosheets, the thermal stability and thermal conductivity of GO/BIIR vulcanizates increased significantly.