Ferroelectricity in odd- and even-numbered nylons
Ferroelectricity in odd- and even-numbered nylons
复制标题
奇数和偶数尼龙中的铁电性
DOI：
10.1080/00150199808018226
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发表时间：
1998
期刊：
影响因子：
0.8
通讯作者：
M. Hashimoto
中科院分区：
文献类型：
--
作者：
T. Itoh;M. Takano;T. Yanagisawa;M. Hashimoto
本文测定了急冷态尼龙6和冷拉态尼龙11的D-E滞后和开关时间，并进行了X射线衍射、红外光谱和热分析。前者的最大反射极化为58 mC/m2，后者为52 mC/m2。尼龙6的这种铁电性部分与336 K时C P的放热异常有关，并归因于分子堆积松散、氢键不完整的向列型不稳定结构中独立的偶极旋转，而分子间的空间位阻主要影响冷拔尼龙11的D-E滞后消失。这些结果表明，在尼龙链中相邻的酰胺基团之间的CH 2基团的数目（偶数或奇数：在具有全反式构象的链中的极性或非极性性质）不是导致尼龙铁电性质的决定性因素。
Abstract The D–E hysteresis and switching time were measured as well as X-ray, FTIR and thermal analyses for as-quenched nylon 6 and cold-drawn nylon 11 after quenching. The maximum remanent polarization of the former was 58 mC/m2 and that of the latter was 52 mC/m2. Such ferroelectricity in nylon 6 was partly related with an exothermic anomaly in C P at 336 K and attributed to the independent dipole rotation in the nematic-type unstable structure with loose molecular packing and imperfect hydrogen bonding, while the intermolecular steric hindrance mainly affected the D–E hysteresis disappearance in the cold-drawn nylon 11. Such results indicated that the number of CH2 groups between adjacent amide groups in a nylon chain (even or odd: polar or non-polar property in a chain with all-trans conformation) was not the determining factor in the cause of the ferroelectric property of nylons.