聚苯乙烯增强的室温硫化硅橡胶的制备及表征  

Preparation and characterization of room temperature vulcanized silicone rubber reinforced with polystyrene

作　　者：张乃强[1] 董建[2] 刘宗林[3] 

机构地区：[1]泰山医学院基础医学院,山东泰安271016 [2]泰山医学院化工学院,山东泰安271016 [3]山东大学化学与化工学院,济南250100

出　　处：《合成橡胶工业》2012年第2期120-123,共4页China Synthetic Rubber Industry

基　　金：山东省优秀中青年科学家科研奖励基金资助项目(BS 2010 CL 045)

摘　　要：以过氧化苯甲酰(BPO)为引发剂,使苯乙烯(St)在α,ω-羟基聚二甲基硅氧烷(PDMS)的甲苯溶液中进行自由基聚合制备PDMS/聚苯乙烯(PS)共混物,在甲基三乙氧基硅烷与PDMS的质量比为1∶1时,制得PS增强的室温硫化硅橡胶。研究了原料配比、BPO用量和甲苯用量对硅橡胶力学性能的影响,并对其微观结构进行了表征。结果表明,当PDMS/St(质量比)为60/40、BPO为PDMS质量的2.5%、甲苯/PDMS(质量比)为2时,所得硅橡胶的拉伸强度可达到3.8 MPa,PS的增强效果明显;该室温硫化硅橡胶具有微相分离结构,PS作为分散相分布于PDMS连续相中,且具有2个玻璃化转变温度。α,ω-dihydroxy-polydimethylsiloxane/ polystyrene （PDMS/PS） blends were prepared when styrene （St） was radical-polymerized in the toluene solution of PDMS using benzoyl peroxide （BPO） as initiator. The room temperature vulcanized silicone rubbers reinforced with PS were prepared at methyl- triethoxysilicane （MTES）/PDMS（ mass ratio） 1： 1. The influences of feed ratio, amount of BPO and tol- uene on mechanical properties of the silicone rubbers were studied, and the microstructure of silicon rub- ber was characterized. The results showed that the tensile strength of silicone rubber obtained could reach 3.8 MPa, and the reinforcement effect of PS was significant under the conditions of PDMS/St （mass ratio） 60/40, the mass fraction of BPO 2.5% by PDMS, and toluene/PDMS （mass ratio） 2. The room temperature vulcanized silicone rubber had a microphase separation structure, and its PS domains dispersed within a continuous PDMS ma- trix, exhibiting two glass transition temperatures.

关 键 词：α ω-羟基聚二甲基硅氧烷 室温硫化 硅橡胶 自由基聚合 聚苯乙烯 甲苯 力学性能 微相分离 

分 类 号：TQ333.93[化学工程—橡胶工业]