Moisture sorption, transport, and hydrolytic degradation in polylactide |
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Authors: | Richard A. Cairncross Jeffrey G. Becker Shri Ramaswamy Ryan O'Connor |
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Affiliation: | (1) Chemical and Biological Engineering, Drexel University, 19104 Philadelphia, PA;(2) Bio-Based Products, University of Minnesota, 5510 St. Paul, MN;(3) NatureWorks, LLC, 55345 Minnetonka, MN |
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Abstract: | Management of moisture penetration and hydrolytic degradation of polylactide (PLA) is extremely important during the manufacturing, shipping, storage, and end-use of PLA products. Moisture transport, crystallization, and degradation, in PLA have been measured through a variety of experimental techniques including size-exclusion chromatography, differential scanning calorimetry, and X-ray diffraction. Quartz crystal microbalance and dynamic vapor sorption experiments have also been used to measure moisture sorption isotherms in PLA films with varying crystallinity. A surprising result is that, within the accuracy of the experiments, crystalline and amorphous PLA films exhibit identical sorption isotherms. |
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Keywords: | PLA biodegradable polymers bio-based polymers polylactic acid diffusion hydrolysis |
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