中文摘要：

以己内酰胺及乙醇胺进行开环聚合,合成了聚酰胺预聚物（PrePA）,并采用N,N＇-碳酰双己内酰胺（CBC）和1,4-双（2-噁唑啉）苯（PBOX）对其进行了扩链反应.进一步将PrePA与己二酸缩聚,制备了聚酯酰胺预聚体（PrePEA）,以CBC和PBOX复合扩链剂扩链,获得了特性黏数达0.74 dL/g的聚酯酰胺.并采用红外、核磁及WAXS对聚合物的结构和晶型进行了表征,以DSC和TGA测定了聚合物的热性能,同时对聚合物的力学性能进行了测定.

英文摘要：

Provided a method to synthesize Nylon-6 oligomers with certain molecular weight and to further synthesize polyesteramides having short Nylon-6 segments connected by ester linkages. Polyamide prepolymer （PrePA） with molecular weight of 524.6 to 808.1 was synthesized by a ring-opening polymerization of ε- caprolactam in the presence of aminoethanol under the catalysis of H3PO3. The chain extension of the PrePAs was studied using N, N＇-earbonylbiscaprolactamat （ CBC ） and 2,2＇-（ 1,4-phenylene ）-bis （ 2-oxazoline ） （PBOX） as combined chain extenders. Through polycondensation of PrePA with adipic acid, polyesteramide prepolymers（PrePEA） with intrinsic viscosity of 0.22- 0.30 dL/g were synthesized. Chain extension of the PrePEAs was carried out using PBOX and CBC as combined chain extenders and the chain extended polyesteramide （ExtPEA） with intrinsic viscosity up to 0.74 dL/g was obtained. The ExtPEAs were characterized by FTIR and 1H-NMR spectra, differential scanning calorimetry （DSC）, thermogravimetric analysis （TGA） ,wide angle X-ray scattering （WAXS） and tensile test. The DSC study showed that after chain extension the Tm and AHm of the polyesteramides decreased. ExtPEA with [ η] of 0.72 dL/g had the Ts of 30% and Tm of 163%. WAXS characterization showed that the ExtPEA had similar crystal characteristics to the Nylon-6 crystallites. TGA study showed that the ExtPEA had good thermal stability with initial decomposition temperature over 330%. Tensile test showed that typical ExtPEA samples had a tensile strength of 14.1 MPa and a strain at break of 68.6%. The ExtPEA has high Tm,good thermal stability and moderate tensile strength, and is suitable for melt processing. Meanwhile, presence of the ester linkages and lower crystallinity in the ExtPEA may lead to improved biodegradability of the ExtPEA compared to the normal nylon- 6.