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以聚酯二元醇、甲苯二异氰酸酯、1,4丁二醇、1,1,1三羟甲基丙烷和纳米钛酸钡粉体为原料,采用一步法制备了一系列BaTiO3/聚氨酯复合物弹性体.BaTiO3/聚氨酯复合物弹性体的密度、硬度和介电常数随钛酸钡含量的增加而增加.采用数字散斑相关测量方法研究了复合物弹性体在电场诱导下的应变与复合物中钛酸钡含量的关系.结果表明BaTiO3/聚氨酯复合物弹性体在外加高压电场的作用下,随着高压电源的开合,其应变也随之呈现出相应的收缩与回复.复合物的电致伸缩系数高于相应的聚氨酯弹性体,但复合物的电致伸缩系数随复合物中钛酸钡含量的增加而逐渐减小.
A series of BaTiO3 / polyurethane composites were prepared by one-step using polyester diol, toluene diisocyanate, 1,4-butanediol, 1,1,1 trimethylolpropane and nano-barium titanate as raw materials Elastomer.Density, hardness and dielectric constant of BaTiO3 / polyurethane composite elastomer increase with the increase of barium titanate content.Digital speckle correlation measurement method is used to study the effect of electric field induced strain and composite The results show that the BaTiO3 / polyurethane composite elastomer exhibits a corresponding shrinkage and recovery along with the opening and closing of high voltage power supply under the application of high voltage electric field. The induced elastic modulus is higher than that of the corresponding polyurethane elastomer, but the electrostrictive coefficient of the complex decreases with the increase of the content of barium titanate in the composite.