Study of the Organobase Catalyzed Synthesis of Diphenyl Silicone Rubbers and Their Damping Property
Diphenyl silicone raw rubbers were efficiently prepared by anionic ring-opening copolymerization of cyclosiloxanes using CTPB as catalyst.The vulcanized silicone rubbers with different diphenylsiloxane contents were then prepared for studies of damping and other properties.The results showed that the mechanical properties of silicone rubbers first increased and then decreased with the diphenylsiloxane contents increasing from 5 mol％to 50 mol％.Accordingly,the damping loss peak moved to high temperature when the glass transition temperature increased,affording the widened effective damping temperature range.Among which,the silicone rubber with 40 mol％diphenylsiloxane and 50 phr silica exhibited best balance in mechanical and damping properties,with tensile strength of 7.0 MPa and elongation at break of 376％.The effective damping temperature range of this silicone rubber reached 113 ℃(-31 ℃ to 82 ℃)with the maximum loss peak(tanδmax)of 0.7.In addition,replacing the traditional silica filler with carbon black K90 and graphene sheet further enhanced damping performance,affording tanδmax value of 1.2 and 0.7 and broad effective damping temperature range of 127 ℃(-27 ℃ to 100 ℃)and 133 ℃(-33 ℃ to 100 ℃),respectively.This paper provided a novel method for preparing high damping silicone rubbers with wide temperature range,which have great potential for the industrialized application.
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