聚6-氨基己酸-β-丙氨酸的合成及降解行为研究

Preparation and degradation of polymers based on 6-aminocaproic acid and β-alanine

采用熔融缩聚法制备了一种新型可降解的6-氨基己酸(6N)和β-丙氨酸(βA)的二元共聚物(PAA),并研究了该共聚物的性能。采用红外光谱分析(FT-IR)、X射线衍射分析(XRD)、差示扫描量热分析(DSC)、热重分析(TGA)等手段对其结构进行了表征,结果表明,所合成的材料是2种单体的聚酰胺共聚物;随β-丙氨酸含量的增加,共聚物的结晶度、熔融温度呈先减小后增大的趋势,而分解温度呈依次减小的趋势,当共聚物中2种单体摩尔比为1∶1时,其为无定形共聚物。共聚物在去离子水中的降解实验结果表明,材料具有良好的降解性能;不同单体比例合成的共聚物中,共聚物的降解速率与共聚物的结晶度成反比,当聚合物中2种单体摩尔比为1∶1时,聚合物的降解速度最快,2周后几乎完全降解;整个降解过程中,降解液的pH值都维持在相对稳定的水平。在环保方面,该材料可望有良好的应用前景。

Amino acid polymers （PAA） based onβ-aminocaproic acid and β-alanine were prepared by melt con- densation polymerization and characterized by fourier transform infrared spectrometry （FT-IR）, X-ray diffrac- tion （XRD） and differential scanning calorimetry （DSC）. The results show that PAA is a kind of comonomers of polyamide polymers. The comonomers were amorphous polymers when the ratio of the two monomers was 1 ： 1. The crystallization degree and melting point decrease first and then increase with β-alanine content of the comonomers increasing, while its decomposition temperature decreases gradually. The results of degradation of comonomers in water show that its degradation rate decreases first and then increases with β-alanine content of the comonomers increasing. The comonomers were degraded fastest and completely degraded in two weeks wile the monomer ratio is 1 ： 1. The pH value of degradation liquid was relatively stable during the whole process. The comonomers would be potentially applied as eco-friendly materials.