Synthesis and phase Behavior of cholesteric liquid crystal polymers containing glutamic acid in main-chain

摘要

Four polymers (P0-P-3 ) containing peptide chain as polymer backbone were synthesized by condensatim reaction with bis(trichloromethyl)carbonate and triethylamine. The chemical structures of the monomers M-0-M-3 were confirmed by FTIR and H-1-NMR. The structure-property relationships of the monomers and polymers are discussed. Their phase behavior and optical properties were investigated by differential scanning calorimetry, thermogravimetric analysis, and polarizing optical microscopy. Monomers M-1-M-3 and polymers P-1-P-3 displayed cholesteric phases. The results demonstrated that the melt temperature and clear point of monomers M-1-M-3 and polymers (P-1-P-3) decreased with the increase of the flexible spacer length in the side-chain, and the mesophase temperature range of the polymers increased with the increase of the flexible spacer length. (c) 2007 Wiley Periodicals, Inc.