可降解聚羟基乙酸低聚物改性聚酯的合成及其性能

为改善芳香族聚酯(PET)的降解性能,采用可降解的聚羟基乙酸(PGA)低聚物,利用熔融缩聚和固相缩聚联用的工艺路线,对聚酯进行共聚改性合成聚对苯二甲酸乙二醇酯-co-聚乙醇酸共聚酯(PET-co-PGA).借助核磁共振波谱仪、差示扫描量热仪、拉伸试验机、扫描电子显微镜和荧光显微镜等对共聚酯的结构、特征黏度、结晶行为、力...

Synthesis and properties of biodegradable polyglycolic acid oligomer modified polyester

In order to improve the degradation performance of aromatic poly(ethylene terephthalate)(PET),a novel polyethylene terephthalate-co-polyglycolic acid copolymer(PET-co-PGA)was synthesized by copolymerization modification of polyester with degradable polyglycolic acid(PGA)oligomer,through combining melt polycondensation and solid-phase polycondensation process.The structure,intrinsic viscosity,crytallization behavior and degradation property of the novel copolyester were characterized and analyzed by using nuclear magnetic resonance spectrometer,differential scanning calorimeter,tensile tester,scanning electron microscope and fluorescence microscope.The results show that the introduction of PGA damages the regularity of PET and results in the decrease of the melting point,crystallization temperature and crystallization ability.The tensile experiments show that the synthesized copolyester with the low volume of addition of PGA has better tenacity compared with pure PET.When 5%PGA is added,the elongation at the break of the copolyester is increased from 13.1%to 15.0%.The degradation rate of pre-modified PET gradually increases with the amount of PGA added.