Effect of the structure of hydrogen-containing silicone oil on the properties of silicone rubber

Abstract

A series of methyl-terminated and hydrogen-terminated hydrogen-containing silicone oil with different hydrogen content and chain length were synthesized by ring-opening polymerization design. Silicone rubber was prepared with hydrogen-containing silicone oil and vinyl-terminated silicone oil with a viscosity of 8033 mPa s. The silicone rubber was reinforced with vinyl MQ resin with a viscosity of 6223 mPa s and a vinyl content of 0.9%. Then the structure, thermal stability, viscosity of the synthesized hydrogenated silicone oil were characterized and the crosslinking density, mechanical properties, aging properties of the silicone rubber were analyzed. It was found that the mechanical properties of hydrogen-containing silicone oil with hydrogen content of 0.50% and chain length of 50% were the best. The parameters of silicone rubber were obtained as follows: viscosity 35.6 Pa s, tensile strength 5.05 MPa, elongation at break 339.01%, tear strength 7.23 kN/m, hardness 44°, compressive modulus 7.43 MPa. This provides an efficient method for designing high strength and low viscosity silicone rubber materials.