淀粉改性PET-PEG的制备、表征及性质研究

Synthesis,Characterization and Properties of Starch-Modified PET-PEG

使用淀粉改性对苯二甲酸乙二醇酯-聚乙二醇共聚物(PET-PEG),以六亚甲基二异氰酸酯为偶联剂,制备了一系列含淀粉的PET-PEG共聚物(PET-PEG/ST),并对其进行了结构表征和性质分析。实验结果表明,淀粉与PET-PEG发生了偶联反应,随着淀粉质量分数的增加,共聚物的热稳定性有所降低。PET-PEG/ST具有良好的生物降解性,能在淀粉酶作用下快速降解,在不同pH条件下的降解速率由大到小的顺序为:碱性、酸性、中性。

Starch was reacted with polyethylene terephthalate- polyethylene glycol （PET-PEG ） copolymer using hexamethylenediisocyanate as a coupling agent in order to prepare new PET-PEG/ST copolymers.The obtained PET-PEG/ST was characterized by FTIR and 1 H-NMR spectroscopy,thermal analysis,and the water absorption and biodegradable tests. The results show that starch was attached to PET-PEG via couple reaction in the presence of hexamethylenediisocyanate.As compared to PET-PEG,PET-PEG/ST has avariable thermal stability with decreasing melting temperature.PET-PEG/ST has degraded in aqueous solution with different pH under different levels,and the degradation rate of PET-PEG/ST in aqueous solution under different pH values from big to small order as follows：alkaline solution,acidic solution,neutral solution.PET-PEG/ST also tends to degrade in biologically active environments like amylase.