Synthesis and Characterization of Novel Hydrolytically Degradable Polyesters

【摘要】 Six novel hydrolytically degradable polyesters were synthesized from thiodipropionic acid(TDPA) and five diols by melt polycondensation, and characterized by FT-IR, 1H NMR, gel permeation chromatography, differential scanning calorimetry and thermogravimetry analysis. The polystyrene-equivalent number-average(Mn) and weight-average molecular weight(Mw) of these polyesters ranged from 4 900-11 100 Da and 7 900-20 879 Da, respectively, with PDI values of 1.48-1.98. The melting point varied from 62.3-127.9℃, and the 50% mass-loss temperature ranged between 387-417℃. The degradation of these polyesters was studied in terms of relative weight loss in distilled water at different pH. Weight losses of 14%-26% were obtained at pH 7.0, 26%-38% at pH 6.0, and 32%-43% at pH 8.3 over a 20-week period. The ecotoxicity study suggested that safety of the synthesized polyesters for the eisenia foetida. These results indicate that these polyesters have a combination of good thermal and degradability behaviors, which can be tailored through selection of the diol monomers used in the synthesis.更多还原

【Abstract】 Six novel hydrolytically degradable polyesters were synthesized from thiodipropionic acid(TDPA) and five diols by melt polycondensation, and characterized by FT-IR, 1H NMR, gel permeation chromatography, differential scanning calorimetry and thermogravimetry analysis. The polystyrene-equivalent number-average(Mn) and weight-average molecular weight(Mw) of these polyesters ranged from 4 900-11 100 Da and 7 900-20 879 Da, respectively, with PDI values of 1.48-1.98. The melting point varied from 62.3-127.9℃, and the 50% mass-loss temperature ranged between 387-417℃. The degradation of these polyesters was studied in terms of relative weight loss in distilled water at different pH. Weight losses of 14%-26% were obtained at pH 7.0, 26%-38% at pH 6.0, and 32%-43% at pH 8.3 over a 20-week period. The ecotoxicity study suggested that safety of the synthesized polyesters for the eisenia foetida. These results indicate that these polyesters have a combination of good thermal and degradability behaviors, which can be tailored through selection of the diol monomers used in the synthesis.更多还原