酰亚胺二元酸改性聚丁二酸丁二酯性能研究

摘要

A series of high molecular weight poly(butylene succinate) and its copolyester containing rigid imide units were synthesized.The chemical structure and composition of the copolyesters were determined by 1H-NMR spectroscopy and Fourier transform infrared spectroscope.The thermal properties,crystallization behavior and mechanical properties of polymers were investigated using differential scanning calorimetry,X-ray diffraction,thermogravimetric analysis and mechanical properties testing. The enzymatic degradation was investigated using pancreatic lipase solution.The results show that the melting temperature and the relative degree of crystallinity of the copolyester decrease with the increment in pyromellitic imide unit content.However,the thermal degradation temperature (5% decomposition temperature) changes little.The mechanical properties testing shows that the tensile strength has a trend of decrease,but the elongation at break is improved with the increment in imide units.Meanwhile,the enzymatic degradation rate of poly (butylene succinate) is enhanced.%先以均苯四甲酸酐和氨基乙酸为原料合成了一种新的酰亚胺二元酸(IDA)，接着用丁二酸、丁二醇与IDA采用熔融缩聚法合成了一系列含酰亚胺结构的聚合物。通过红外光谱图、核磁共振氢谱图确定了IDA及聚合物的分子结构，通过差示扫描量热仪、热重分析仪测试分析了聚合物的热性能，采用X射线衍射表征了聚合物的结晶性能，利用含脂肪酶的磷酸盐缓冲溶液测试了聚合物的酶降解性能，此外还测试了聚合物薄膜的拉伸性能。实验结果表明，随着IDA的加入，聚合物的熔点降低，热分解温度变化不大，结晶度下降，拉伸强度降低，断裂伸长率增加，酶降解性明显提高。