Poly(dimethyl-methylvinyl)siloxane copolymers with different vinyl contents were synthesized and the influence in vinyl contents in such copolymers on mechanical properties,thermal properties and crosslinking densities of HTV silicone rubbers were investigated.The results indicated that the hardness of the vulcanized silicone rubbers increased with the increase in vinyl contents while the elongations at break decreased with the vinyl contents.The tensile strengths and tear strengths of the vulcanized silico...