Ref.: MpoBel11-003
Apresentador: Amanda Faria Baruel
Autores (Instituição): Baruel, A.F.(Instituto Tecnológico da Aeronáutica / Instituto de Aeronáutica e Espaço); Petroni, S.L.(Instituto de Aeronáutica e Espaço); Dutra, J.C.(Instituto Tecnológico da Aeronáutica); Mello, S.A.(Instituto de Aeronáutica e Espaço); Cassu, S.N.(Instituto Tecnológico de Aeronáutica / Instituto de Aeronáutica e Espaço);
Resumo:
Polymeric blends have been widely utilized in a variety of applications. Blending two different materials can lead to materials with enhanced properties. Natural rubber (NR) is widely used in several areas, and its properties include high abrasion resistance, good hysteresis properties, high tear and tensile strength. However, it may present low fatigue resistance and low resistance to degradation. The addition of Chlorobutyl rubber (CIIR) to NR can improve degradation resistance, enhance damping and barrier properties. In recent years, nanomaterials such as bentonite clay have garnered significant attention from the scientific community due to their ability to enhance properties at very low concentrations. The addition of clay to a rubber blend can enhance mechanical properties, gas permeation, and damping properties. In this study, the vulcanization process of a NR/CIIR blends containing a commercial bentonite clay was evaluated by MDR and DSC. The proportion of NR/CIIR varied between 100/0 phr to 50/50 phr. The effects of increasing CIIR and clay contents were evaluated. A decrease in reversion was observed for NR/CIIR/Clay blends in comparison to NR rubber. Clay addition accelerated the vulcanization process, while CIIR addition slowed it. Clay addition also increased the Maximum Torque (MH), which is related to the viscosity of the rubber, while CIIR decreased it.