New Ferroelectric Polymers with Hydrogen Bonding

众所周知，具有大偶极矩的氢键部分是制造有用聚合物的原料，如尼龙或聚氨酯。预计具有大偶极子的聚合物，如酰胺或氨基甲酸乙酯基团，可以通过化学结构的控制形成具有氢键的极性结构。这种聚合物的结构可以是铁电极性聚集体。在这项工作中，我们提出了具有奇数CH2基团的线性脂肪链的铁电聚氨酯，聚酰胺，聚氨酯和聚硫脲。这些聚合物的化学结构允许在聚合物链和铁电填料中形成极性结构。因此，首次发现了脂肪族聚硫脲、聚氨酯和a - b型尼龙中的铁电行为。所有聚合物的薄膜几乎都是无定形的，具有很强的氢键。在60℃的温度下，聚合物的剩余极化和热释电常数分别为10-100mC/m2和5-40mC/m2K。从氢键的角度讨论了材料的介电行为、铁电行为和热释电行为的初步研究。

Hydoegen bonding moieties, which has a large dipole moment, is wellknown to make useful polymers, such as nylons or polyurethanes. It is anticipated that polymers having the large dipoles, like amide or urethane group, would be capable to having a polar structure with hydrogen bonding by the control of chemical structure. The structure of such polymers can be ferroelectric polar aggregates.in this work, we propose ferroelectric polyureas, polyamide, polyurethanes, and polythioureas which have a linear aliphatic chain with odd numbers of CH2 groups. The chemical structure of these polymers permits the formation of a polar structure in the polymer chain and ferroelectric packing.As a result, ferroelectric behavior in aliphatic polythioureas, polyurethanes, and A-B type nylons is found for the first time. The films of all the polymers were almost amorphous with strong hydrogen bonding. The meaasured remanent polarization and pyroelectric onstant in the polymers were found to be 10-100mC/m2 and 5-40mC/m2K at 60ﾟC,respectively. The preliminary studies on dielectric, ferroelectric and pyroelectric behavious was discussed in view of the hydrogen bonding.