Nonisothermal melt crystallization kinetics of thio-ether-contained poly(ether ether ketone ketone) copolymers was studied by DSC. The result shows that the crystallization activation energy was increased accompanied ...Nonisothermal melt crystallization kinetics of thio-ether-contained poly(ether ether ketone ketone) copolymers was studied by DSC. The result shows that the crystallization activation energy was increased accompanied by the introduction of thio-ether structure. The random copolymer possesses a higher crystallization activation energy than the block one at the same thio-ether ratio.展开更多
Block copolymers containing poly(aryl ether ketone) unit and different lengths of thermotropic liquid crystalline polyesters(TLCP) segments were synthesized by high temperature solution polymerization. The chemical st...Block copolymers containing poly(aryl ether ketone) unit and different lengths of thermotropic liquid crystalline polyesters(TLCP) segments were synthesized by high temperature solution polymerization. The chemical structure, thermal properties and liquid crystalline behavior of the block copolymers were investigated by FTIR, DSC and PLM respectively. A single glass transition revealed that the two blocks had good a compatibility. The length of TLCP segment had a significant influence on the copolymers′ liquid crystalline behavior. When the molecular weight of TLCP reduced to 2965, liquid crystallinity of copolymer disappeared. The block copolymers showed a typical nematic threaded texture which differed from polyester′s.展开更多
文摘Nonisothermal melt crystallization kinetics of thio-ether-contained poly(ether ether ketone ketone) copolymers was studied by DSC. The result shows that the crystallization activation energy was increased accompanied by the introduction of thio-ether structure. The random copolymer possesses a higher crystallization activation energy than the block one at the same thio-ether ratio.
文摘Block copolymers containing poly(aryl ether ketone) unit and different lengths of thermotropic liquid crystalline polyesters(TLCP) segments were synthesized by high temperature solution polymerization. The chemical structure, thermal properties and liquid crystalline behavior of the block copolymers were investigated by FTIR, DSC and PLM respectively. A single glass transition revealed that the two blocks had good a compatibility. The length of TLCP segment had a significant influence on the copolymers′ liquid crystalline behavior. When the molecular weight of TLCP reduced to 2965, liquid crystallinity of copolymer disappeared. The block copolymers showed a typical nematic threaded texture which differed from polyester′s.
