Abstract
In this contribution the sorption of water vapor in Poly(L-lactic acid) (PLLA) was studied by time-resolved FTIR spectroscopy. The collected FTIR data were analyzed by complementary approaches such as difference spectroscopy, two-dimensional correlation spectroscopy (2D-COS), and least-squares curve-fitting analysis which provided information about the overall diffusivity, the nature of the molecular interactions among the polymer and the penetrant and the dynamics of the various molecular species. The diffusion coefficient were evaluated as a function of vapor activity and were found in good agreement with previously reported values. The system showed a Fickian behavior with diffusivity increasing with penetrant concentration. Two distinct water species (first-shell and second-shell layers) were detected and quantified by coupling FTIR and gravimetric measurements.
Highlights
Over the past decade, the use of polymeric biodegradable materials has increased substantially because of their versatility in a variety of applications as well as for the increasing environmental concern
We report on a time-resolved FTIR study performed at different relative pressures of water vapor
In the present contribution the sorption of water vapor in Poly(L-lactic acid) (PLLA) has been studied by FTIR spectroscopy
Summary
The use of polymeric biodegradable materials has increased substantially because of their versatility in a variety of applications as well as for the increasing environmental concern. The hydrolytic products are non-harmful and non-toxic monomers/oligomers because they are metabolized via the citric acid (Krebs) cycle For both medical and packaging applications, hydrolysis would be one of the most important degradation mechanism to account for. In all the above applications, the diffusion of water in the bulk material represent one of the major issue to be considered In this contribution, a molecular level description of water vapor diffusion in a fully amorphous PLLA matrix is reported. Solvent was detected by spectroscopic (FTIR) and gravimetric (TGA) measurement
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