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 whena ionger pulse repetition time of 3 secends is used. A somewhat plausible explanationis given for these unusual observations. The temperature depen-dence of the spectroscopic properties is also discussed in terms of molecular interactions.