A liquid crystalline block copolymer (BCPE) was synthesized from bis phenol A epoxy oligomer and liquid crystalline polyester (PBHT) which was prepared from polyhexamethylene bis (4 oxybenzoates) and terephthaloyl dic...A liquid crystalline block copolymer (BCPE) was synthesized from bis phenol A epoxy oligomer and liquid crystalline polyester (PBHT) which was prepared from polyhexamethylene bis (4 oxybenzoates) and terephthaloyl dichloride by solution polymerization.The intrinsic viscosity ( η inh ) of the polymers was determined using an ubbelohde viscometer in phenyl hydroxide/1,1,2,2 tetrachloroethane mix solvent (1:1) at 30℃, and the results showed that the η inh values of PBHT and BCPE are 0.16 dL/g and 0.46 dL/g respectively. FTIR analysis identified the reaction between bis phenol A epoxy oligomer and PBHT. The crystalline properties of polymers were investigated with DSC and WAXD, and the results found that the crystallinity of BCPE is inferior to that of PBHT due to addition of amorphous epoxy. Thermotropic liquid crystalline nematic phase textures of polymers were observed under a polarizing microscope with hot stage.展开更多
文摘A liquid crystalline block copolymer (BCPE) was synthesized from bis phenol A epoxy oligomer and liquid crystalline polyester (PBHT) which was prepared from polyhexamethylene bis (4 oxybenzoates) and terephthaloyl dichloride by solution polymerization.The intrinsic viscosity ( η inh ) of the polymers was determined using an ubbelohde viscometer in phenyl hydroxide/1,1,2,2 tetrachloroethane mix solvent (1:1) at 30℃, and the results showed that the η inh values of PBHT and BCPE are 0.16 dL/g and 0.46 dL/g respectively. FTIR analysis identified the reaction between bis phenol A epoxy oligomer and PBHT. The crystalline properties of polymers were investigated with DSC and WAXD, and the results found that the crystallinity of BCPE is inferior to that of PBHT due to addition of amorphous epoxy. Thermotropic liquid crystalline nematic phase textures of polymers were observed under a polarizing microscope with hot stage.