Novel degradable copolyesters containing poly(ethylene oxalate) units derived from diethylene oxalate
Novel degradable copolyesters containing poly(ethylene oxalate) units derived from diethylene oxalate
复制标题
DOI：
10.1016/j.polymdegradstab.2005.04.023
复制
发表时间：
2006
影响因子：
5.9
通讯作者：
Yunhui Zhao;Gen-hui Xu;Xubo Yuan;J. Sheng
中科院分区：
文献类型：
--
作者：
Yunhui Zhao;Gen-hui Xu;Xubo Yuan;J. Sheng
以草酸二乙酯（DEOX）为原料，采用熔融缩聚法合成了两个系列的聚丁二酸-丁二酸-癸二酸共聚物（PETOXS）。NMR定量了共聚酯的组成、结构和平均序列长度。根据PETOXS特征，熔融和结晶性能彼此不同。TG曲线分析表明，PET的初始降解温度受PET含量的影响。据观察，杨氏模量和最大拉伸应力的增加而增加的含量的聚（草酸乙烯酯）（PEOX）的脂肪族单元，而断裂伸长率显着降低。在碱水解实验中观察到明显的重量损失，并且当两个脂肪族聚酯单元的比例变化时，降解速率受到不同因素的影响。对降解后的样品进行了DSC分析，研究了熔融温度和结晶度的变化。
Two series of poly(ethylene terephthalate-co-oxalate-co-sebacate) (PETOXS) have been synthesized by melt polycondensation using diethylene oxalate (DEOX) as a starting material. NMR quantified the composition, structure, and average sequence length of the copolyesters. Melting and crystallization properties differ from each other on the basis of PETOXS feature. Analysis of TG traces determined that initial degradation temperatures were affected by the content of PET. It was observed that the Young's modulus and the maximum tensile stress increased with increasing content of poly(ethylene oxalate) (PEOX) in aliphatic units, whereas the elongation at break considerably decreased. Obvious weight loss was observed in alkali hydrolysis experiments, and the degradation rates are subject to distinct factors when the ratio of two aliphatic polyester units is varied. DSC was performed to degraded copolyester samples, and the variation of melting temperature and crystallinity were investigated.