摘要
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
financially supported by the National Natural Science Foundation of China (Nos.50873013 and 21244006)
