Nonelectrical poling in ferroelectric polythioureas
Nonelectrical poling in ferroelectric polythioureas
复制标题
铁电聚硫脲的非电极化
DOI：
10.1109/58.883520
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
N. Inagaki
中科院分区：
文献类型：
--
作者：
S. Tasaka;H. Ohta;N. Inagaki
提出了一种利用硫脲基团的协同作用和强氢键力在聚硫脲[聚八亚甲基硫脲和聚九亚甲基硫脲]中形成铁电极化的新方法。该方法利用极性非晶材料的表面能差，形成反射极化，称为表面能极化。将夹在具有较高表面能的金属和具有较低表面能的聚乙烯之间的聚硫脲膜加热至T/sub c/ [1.15/spl ×/T/sub g/（玻璃化转变温度）]并缓慢冷却至室温。得到的膜显示出10 /spl mu/m/sup 2/K的热释电常数，给出了反射极化的证据。这种方法类似于液晶器件中的取向过程。
A new poling method utilizing the cooperativity and strong hydrogen bonding force of thiourea groups is proposed in ferroelectric polythioureas [poly(octamethylene thiourea) and poly(nonamethyleno thiourea)]. The method, which is named "surface energy poling," takes advantage of the surface energy difference of the polar amorphous material to form remanent polarization. A polythiourea film sandwiched between a metal with higher surface energy and polytetrafluoroethylenes with lower surface energy was heated up to T/sub c/ [1.15/spl times/T/sub g/ (glass transition temperature)] and cooled slowly to room temperature. The resulting film showed a pyroelectric constant of 10 /spl mu//m/sup 2/K, giving evidence of remanent polarization. This method is similar to the orientation process in liquid crystal devices.