热驱动三元乙丙橡胶/二氧化硅复合材料的制备及性能研究

Research on Preparation and Properties of Thermal Driven EPDM/Silica Composites

以机械共混法制备三元乙丙橡胶(EPDM)/二氧化硅(SiO2)复合材料,采用机械训练工艺制备EPDM基人工肌肉材料,并研究其性能。结果表明:当机械训练的应变从50%增大至120%时,SiO2用量为40份、甲基丙烯酸锌用量为12份的EPDM复合材料(记作S40Z12)的EPDM基人工肌肉材料的弹性模量从2.8 MPa增大至35.8 MPa,增大了12.8倍;机械训练后EPDM基人工肌肉材料的Kraus曲线斜率仍为负值且绝对值更大,表明EPDM基体与SiO2颗粒之间的界面作用增强;固定应力模式下,S40Z12@350%(机械训练应变为350%)的EPDM基人工肌肉材料的可逆驱动应变达到47%;EPDM基人工肌肉材料在受到热刺激响应作用下,能够驱动负载物体实现多次可逆切换上升与下降的重复动作,且驱动负载质量超过其自身质量的12600倍,驱动应变大于35%。

Ethylene-propylene-diene monomer rubber(EPDM)/SiO2 composites were prepared by mechanical blending,and EPDM-based artificial muscle materials were prepared by mechanical training process,and their properties were studied.The results showed that,when the strain of mechanical training increased from 50%to 120%,the elastic modulus of EPDM-based artificial muscle material of EPDM composites with 40 phr SiO2 and 12 phr zinc methacrylate(recorded as S40Z12)increased from 2.8 MPa to 35.8 MPa,which increased by 12.8 times.The Kraus curve slope of the EPDM-based artificial muscle material after mechanical training remained negative with an even larger absolute value,indicating that the interface interaction between EPDM matrix and SiO2 particles was enhanced.Under fixed stress mode,the reversible driving strain of the EPDM-based artificial muscle material of S40Z12@350%(with 350%of mechanical training strain)reached 47%.Under the thermal stimulation response,EPDM-based artificial muscle material could drive the load object to achieve multiple reversible switching of rising and falling repetitive actions,with a driving load mass exceeding its mass by 12600 times and a driving strain greater than 35%.