THE SPECTROSCOPIC STUDY OF A NOVEL SIDE CHAIN LIQUID CRYSTAL POLYMER
一种新的侧链型液晶高分子的光谱研究

The structure of a novel side chain liquid crystal polymer, poly-2,5-bis (4-methoxyben-zoyloxy) styrene, was studied by spectroscopic methods including FTIR, FT-RAMAN, 1H-NMR and 13C-NMR. The molecular structure was proved by both IR and RAMAN. However, unexpected results were given by the NMR methods. In the 1H-NMR spectrum, the peaks for the protons on the back-bone carbons are much smaller than that they would be if the numbers of different protons are considered. In addition, the 13C-NMR signals for the back-bone carbons are even undetectable if a pulse lepetition time of 1.5 seconds is used, which can, ho-wevar, be seen in the spectrum when a ionger pulse repetition time of 3 secends is used. A somewhat plausible explanation is given for these unusual observations. The temperature dependence of the spectroscopic properties is also discussed in terms of molecular interactions.