Effect of compatibilizers on the miscibility of natural rubber/silicone rubber blends

Abstract

In this study, the blending system of natural rubber (NR) and silicone rubber (SR) at 70/30 ratio was investigated. Two kinds of graft polymers, polysiloxane‐g‐octane with different grafted ratios (polymers A, B, and C) and polysiloxane‐g‐(3,7‐dimethyl‐6‐octylene) (polymer D), were designed and synthesized to serve as compatibilizers. Dynamic mechanical analysis and scanning electron microscopy analyses showed that the compatibilizers improved the compatibility between NR and SR, and resulted in improved mechanical properties. For example, the tensile strength of the blends with compatibilizer C was 11.7 MPa, whereas that of the blends without any compatibilizer was only 7.86 MPa. The larger the grafted ratios, the better the compatibilization effect of the graft polymer. The differences in compatibilization effects between non‐reactive (polysiloxane‐g‐octane) and reactive [polysiloxane‐g‐(3,7‐dimethyl‐6‐octylene)] compatibilizers can be attributed to their different chemical compositions. The crosslink density obtained from solid‐state nuclear magnetic resonance indicated that the reactive compatibilizer (polymer D) engaged in the crosslink reaction through the active vinyl at the side chains, which effectively inhibited the decreasing trend of the crosslink density caused by the addition of compatibilizers. POLYM. ENG. SCI., 54:355–363, 2014. © 2013 Society of Plastics Engineers

Relationship between dynamic fatigue crack propagation properties and viscoelasticity of natural rubber/silicone rubber composites

“…As for the highly saturated and inorganic backbone structure (-Si-O-) of silicone rubber (VMQ), it possesses excellent high-temperature and ageing resistance. So in this study, NR/VMQ composites 8,9 were prepared to improve anti-ageing and anti-fatigue properties of tire materials at the same time. [10][11][12] Constant strain/stress loading conditions are generally used in fatigue testing, 13 but different modulus of rubber would lead to different G input, further to inuence their fatigue properties.…”

“…As for the highly saturated and inorganic backbone structure (–Si–O–) of silicone rubber (VMQ), it possesses excellent high-temperature and ageing resistance. So in this study, NR/VMQ composites 8,9 were prepared to improve anti-ageing and anti-fatigue properties of tire materials at the same time. 10–12 …”

Compatibilization of polypropylene/Poly(acrylonitrile‐butadiene‐styrene) blends by polypropylene‐graft‐cardanol

“…It is suggest that compatibilizer efficiency is related with compatibizer content. At a low level of compatibilzer content, efficient compatibilzer reduces interfacial tension between the phases of PP/ABS blends and prevents dispersed droplets coalescence . As a result, the compatibility between PP and ABS was improved and the dispersed droplet size was reduced.…”

Understanding the influence of anti‐reversion agent and metal oxide dose on natural rubber–carbon black system

“…[ 7 ] Ozone and oxygen are two factors that are responsible for breaking polymer chains with a simultaneous reduction of molecular weight. [ 8–11 ] Selection of proper antioxidant and antiozonants can restrict such effects. Another common method to restrict the reversion of the high diene elastomers while curing with accelerated sulfur system is by fusing a certain chemical commonly known as anti‐reversion agent (ARA) into the formulation.…”