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• W2549576312 abstract "Abstract To investigate the factors that affect the physical properties of poly ( l -lactide) [poly (L-LA)] processed with supercritical carbon dioxide (scCO 2 ), the present work assessed the degradability of poly (L-LA), as well as its thermal and mechanical properties before and after processing. The thermal properties of three types of poly (L-LA) (H100, H440 and REVODE), each having different properties, were examined. Poly (L-LA) films were treated with scCO 2 using a high pressure reaction apparatus at 40 °C and 14 MPa for 3 h. The treated samples subsequently underwent enzymatic degradation tests using proteinase K. The poly (L-LA)s processed with scCO 2 degraded more slowly compared to polymers not treated with scCO 2 during the early stages of degradation. Scanning electron microscopy images of the degraded, scCO 2 -processed poly (L-LA)s indicated close spacing of the cavities generated by degradation. The melting point ( T m ) values of all poly (L-LA)s increased with scCO 2 processing, which influenced the degradability. Although the degradation of processed poly (L-LA) was slower than that of unprocessed poly (L-LA) in the early stages, the degradability of the treated H440 and REVODE samples was identical to that of specimens without scCO 2 processing after 160 h. In addition, the poly (L-LA) treated with scCO 2 was found to be degraded by proteinase K at a constant rate. The relationship between degradability and crystallinity was examined, and untreated H100 was observed to rapidly degrade in contact with proteinase K. The crystallinity indicators X c DSC and X c XRD increased after scCO 2 processing, such that the degradability of the treated sample was reduced. In addition, both the X c DSC and X c XRD values of untreated and treated H100 increased with degradation. Although the degradation curve of the REVODE was similar to that of the H440, the changes in the crystallinity of untreated REVODE were different from the results observed for the H100 and H440. XRD data showed that the diffraction peaks of the untreated H100 and the poly (L-LA)s treated with scCO 2 , which were more highly crystalline, shifted to smaller angles as the enzymatic degradation progressed. Examination of the mechanical properties indicated increases in tensile strength and elastic modulus and decreases in elongation after scCO 2 processing, suggesting that the polymer chains were moved closer together. In conclusion, scCO 2 processing appears to uniformly contract polymer chains in both the amorphous and crystalline regions." @default.
• W2549576312 created "2016-11-30" @default.
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• W2549576312 date "2016-12-01" @default.
• W2549576312 modified "2023-10-18" @default.
• W2549576312 title "Enzymatic degradation of poly(l-lactide) treated with supercritical carbon dioxide" @default.
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• W2549576312 doi "https://doi.org/10.1016/j.polymdegradstab.2016.11.010" @default.
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