Deuterium NMR analysis of main-chain polymer liquid crystals
Deuterium NMR analysis of main-chain polymer liquid crystals
复制标题
主链聚合物液晶的氘核磁共振分析
DOI：
10.1007/bf01153439
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发表时间：
1988
期刊：
影响因子：
3.2
通讯作者：
A. Abe
中科院分区：
文献类型：
--
作者：
Hidemine Furuya;A. Abe
已经对具有结构如{N-OC（O）-N-O（CD 2）nO-N-C（O）O-N-O（CH 2）nO} x（n = 9，10）的主链聚合物液晶进行了氘NMR测量。本文比较了NC-φ-φ-O（CD_2）_nO-φ-φ-CN（n = 9，10）型二聚体液晶的D-NMR谱，虽然聚合物谱的分辨力较差，但其谱的一般轮廓与相应的二聚体相似。RIS分析的结果表明，在二聚体和聚合物之间的间隔子的空间构型几乎是相同的。它已得出结论，所观察到的增强四极分裂应主要来自更高的取向有序的聚合物系统中的分子轴。
Deuterium NMR measurements have been performed for main-chain polymer liquid crystals having structures such as {Ø-OC(O)-Ø-O(CD2)nO-Ø-C(O)O-Ø-O(CH2)nO}xwith n = 9, 10. D-NMR spectra obtained in the nematic mesophase are compared with those previously reported for the dimer liquid crystals of the type NC-φ-φ-O(CD2)nO-φ-φ-CN with n = 9, 10, Although resolutions are relatively poor in the polymer spectrum, the general profiles of the spectra were found to be similar to those of the corresponding dimer. The results of the RIS analysis suggest that the spatial configurations of the spacer are nearly identical between the dimer and polymer. It has been concluded that the observed enhancement in the quadru-polar splittings should arise largely from a higher orientational ordering of the molecular axis in the polymeric system.