Ferroelectric Behavior in Aliphatic Polyurethanes
Ferroelectric Behavior in Aliphatic Polyurethanes
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脂肪族聚氨酯的铁电行为
DOI：
10.1143/jjap.33.1376
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发表时间：
1994
影响因子：
1.5
通讯作者：
Norihiro Inagaki Norihiro Inagaki
中科院分区：
文献类型：
--
作者：
S. Tasaka;Toshikatu Shouko;Kei;Norihiro Inagaki Norihiro Inagaki
在脂肪族聚氨酯、聚(三亚甲基七亚甲基二氨基甲酸酯)(3，7-PU)和聚(五亚甲基六亚甲基二氨基甲酸酯)(5，6-PU)中首次发现铁电行为。根据位移场(D-E)磁滞回线，估算了两种聚合物的剩余极化为50-60 mC/m2。在玻璃化转变温度(30℃)到115℃之间，3，7-PU的剩余极化是稳定的，在此温度下，晶体中发生了氢键的重新取向。这些不仅具有奇数个CH2基团，而且具有奇数个CH2基团的聚氨酯很可能形成铁电晶体。在它们的熔点之前没有发现居里点。
Ferroelectric behavior was first found in aliphatic polyurethanes, poly(trimethylene-heptamethylene dicarbamate) (3,7-polyurethane) and poly(pentamethylene-hexamethylene dicarbamate) (5,6-polyurethane). From a displacement-field (D-E) hysteresis loop, remanent polarization was estimated as 50–60 mC/m2 for both polymers. The remanent polarization in annealed 3,7-polyurethane was stable over the glass transition temperature (30° C) up to 115° C, from which the reorientation of hydrogen bondings takes place in crystal. These polyurethanes with not only an odd-odd number but also an even-odd number of CH2 groups are likely to form a ferroelectric crystal. No Curie point was found up to their melting points.