Degradation Behaviors of Polylactic Acid, Polyglycolic Acid, and Their Copolymer Films in Simulated Marine Environments.

For all these three samples, the values of S amorphous during degradation all showed a trend of initially increasing and then maintaining a constant.

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It can be seen that with the increase of degradation time, the absorbance intensity ratios of both PLGA-85 and PLGA-75 showed an increasing trend, indicating that the degradation occurred preferentially in the GA units; similar results have also been reported in other studies [ 44 ].

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