Two kinds of aliphatic alternating polyesteramide prepolymers were prepared through melt polycondensation from N,N'-bis(2-hydroxyethyl)-adipamide and adipic acid or sebacic acid.Chain extension of them was conduct...Two kinds of aliphatic alternating polyesteramide prepolymers were prepared through melt polycondensation from N,N'-bis(2-hydroxyethyl)-adipamide and adipic acid or sebacic acid.Chain extension of them was conducted with 2,2'-(1,4-phenylene)-bis(2-oxazoline)and adipoyl biscaprolactamate as combined chain extenders.The chain extended polyesteramides(ExtPEAs)were characterized by IR,1H-NMR,differential scanning calorimetry,thermogravimetric analysis,wide angle X-ray scattering,tensile test and enzymatic degradation.The results showed that the ExtPEA(4,m)s were mainly constituted with the diester adipamide alternating units.ExtPEA(4,4)and ExtPEA(4,8)had Tm of 83.8℃and 85.8℃and initial decomposition temperature above 310.0℃.They crystallized similarly as Nylon-66 did and were flexible thermoplastic materials with tensile strength up to 25.64 MPa and strain at break up to 737%.展开更多
In order to obtain a novel polyamide having excellent heat-resistant properties which could be anticipated as a thermal modifier for aliphatic polyamide,a series of new semi-aromatic polyamides (BO6,BO8,BO10) containi...In order to obtain a novel polyamide having excellent heat-resistant properties which could be anticipated as a thermal modifier for aliphatic polyamide,a series of new semi-aromatic polyamides (BO6,BO8,BO10) containing benzoxazole unit were synthesized based on 5-amino-2-(p-aminophenyl) benzoxazole (ABO) and aliphatic acids (adipic,suberic and sebacic acid) by means of Yamazaki phosphorylation method.The effect of reaction temperature on the inherent viscosity of the polymers was studied,and the structures of products were characterized by FTIR,1 H-NMR,and the heat resistance of the polymers was studied by DSC and TG.The results showed that the reaction temperature gives the polymers the highest viscosity at around 90 ℃,130 ℃ and 130 ℃ for BO6,BO8 and BO10,respectively.The heat resistance of the new semi-aromatic polyamides is much higher than that of the common aliphatic polyamides.In addition,the products show good solvent resistance and crystallization properties.展开更多
A series of thermotropic liquid crystalline polyesteramides with differ-ent sequence structure based on dimethylbenzidine (DMBD), bisphenol-A(BPA) and p-terephthalyl chloride (TPC) was synthesized by changing the feed...A series of thermotropic liquid crystalline polyesteramides with differ-ent sequence structure based on dimethylbenzidine (DMBD), bisphenol-A(BPA) and p-terephthalyl chloride (TPC) was synthesized by changing the feeding order of monomers inlow temperature solution polycondensation system. By means of NMR and a computer pro-gram the sequence structure parameters were measured. The effect of sequence structureon liquid crystalline phase transition temperature of PEAs obtained was investigated.展开更多
基金financially supported by the National Natural Science Foundation of China (Nos.50873013 and 21244006)
文摘Two kinds of aliphatic alternating polyesteramide prepolymers were prepared through melt polycondensation from N,N'-bis(2-hydroxyethyl)-adipamide and adipic acid or sebacic acid.Chain extension of them was conducted with 2,2'-(1,4-phenylene)-bis(2-oxazoline)and adipoyl biscaprolactamate as combined chain extenders.The chain extended polyesteramides(ExtPEAs)were characterized by IR,1H-NMR,differential scanning calorimetry,thermogravimetric analysis,wide angle X-ray scattering,tensile test and enzymatic degradation.The results showed that the ExtPEA(4,m)s were mainly constituted with the diester adipamide alternating units.ExtPEA(4,4)and ExtPEA(4,8)had Tm of 83.8℃and 85.8℃and initial decomposition temperature above 310.0℃.They crystallized similarly as Nylon-66 did and were flexible thermoplastic materials with tensile strength up to 25.64 MPa and strain at break up to 737%.
基金Sponsored by the Natural Scientific Research Innovation Foundation in Harbin of Institute of Technology(Grant No. 2008. 05)
文摘In order to obtain a novel polyamide having excellent heat-resistant properties which could be anticipated as a thermal modifier for aliphatic polyamide,a series of new semi-aromatic polyamides (BO6,BO8,BO10) containing benzoxazole unit were synthesized based on 5-amino-2-(p-aminophenyl) benzoxazole (ABO) and aliphatic acids (adipic,suberic and sebacic acid) by means of Yamazaki phosphorylation method.The effect of reaction temperature on the inherent viscosity of the polymers was studied,and the structures of products were characterized by FTIR,1 H-NMR,and the heat resistance of the polymers was studied by DSC and TG.The results showed that the reaction temperature gives the polymers the highest viscosity at around 90 ℃,130 ℃ and 130 ℃ for BO6,BO8 and BO10,respectively.The heat resistance of the new semi-aromatic polyamides is much higher than that of the common aliphatic polyamides.In addition,the products show good solvent resistance and crystallization properties.
基金This work was supported by Special Foundation of State Education Committee for Doctoral Program
文摘A series of thermotropic liquid crystalline polyesteramides with differ-ent sequence structure based on dimethylbenzidine (DMBD), bisphenol-A(BPA) and p-terephthalyl chloride (TPC) was synthesized by changing the feeding order of monomers inlow temperature solution polycondensation system. By means of NMR and a computer pro-gram the sequence structure parameters were measured. The effect of sequence structureon liquid crystalline phase transition temperature of PEAs obtained was investigated.
