Mass spectrometric research of cholesteric liquid crystals. II. Identification of liquid crystal mixtures by GC-MS

Mixtures of cholesteryl chloride, cholesteryl oleic carbolate and cholesteryl esters (M.W.< 500) were analyzed with packed column GC-MS directly. When the molecular weights of cholesteryl esters are over 500, the identification is aided by analysis of methyl esters with capillary column GC-MS after conversion of the sample into corresponding methyl carboxylate. This method gives a satisfactory result in characterization of liquid crystal mixtures. M-80 gas cromatographic mass spectrum (associated computer MOO3) was used in analysis. The cholesteric liquid crystals camples were supplied by the inst. of Applied chemistry of this university. The results of reaction and GC-MS analysis and the capilary analysis of large molecular weight liquid crystal compounds are discussed.