Study on high temperature degradation performance of poly(glycolic acid)and its regulation method
This work evaluated the degradation property of poly(glycolic acid)(PGA)at different temperature as well as different pH environment.The change of crystallization and thermal stability properties during degradation was studied,and the degradation product of PGA was analyzed by liquid chromatograph-mass spectrometer.Thereafter,PGA was separately modified using anti-hydrolysis agent HyMax@210 and chain extender ADR-6488,and the effects of the two additives on melt fluidity,thermal stability,mechanical properties and degradation performance of PGA were studied.The results indicated that the degradation performance of PGA in high temperature aqueous solution was much better than that of traditional degradable materials.PGA degraded completely at 130℃for 10 h in aqueous solution,and the degradation product was mainly glycolic acid trimers.Increasing pH value promoted the degradation of PGA.The ther-mal stability and mechanical properties of PGA was improved at the present of anti-hydrolysis and chain extender,and the degradation rate of that was delayed.
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