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本世纪50年代发现,有些生物机体组织(例如腱、肌、骨、羊毛、木材等)在承受应力或应变时会产生表面电荷的变化.这一启示说明,有机物质也可产生较大的压电效应.到了60年代末,日本科学家Kawai首先观察到经单轴拉伸和电极化的聚偏氟乙烯(PVDF)薄膜具有强压电性,其压电电压常数g31约为30×10~(-3)Vm/N,引起了各国科学家的极大兴趣,纷纷开展了这一材料性能和压电机理的研究.经过将近十年的工作,PVDF薄膜的压电常数提高了将近10
In the 1950s, it was discovered that some biological tissues (such as tendons, muscles, bones, wool, wood, etc.) are subject to changes in surface charge when subjected to stress or strain. This revelation suggests that organic matter may also produce greater pressure By the late 1960s, Japanese scientist Kawai first observed that the uniaxially stretched and electrodeposited polyvinylidene fluoride (PVDF) films have strong piezoelectric properties with a piezoelectric constant g31 of about 30 × 10 ~ -3) Vm / N, has aroused great interest of scientists in various countries, have carried out the material properties and piezoelectric mechanism research.After nearly 10 years of work, PVDF film piezoelectric constant increased by nearly 10