Abstract
The PLA materials with improved optical property and derived from renewable resources were synthesized through ring-opening polymerization using natural aloe-emodin, having anthraquinone structure and alcoholic hydroxyl group, as initiator. The chemical bonding of the aloe-emodin unit on PLA backbone provided the PLA with the function of absorbing UV light and would avoid the migration of aloe-emodin during the lifetime of PLA materials. The chemical structure of the new PLA was confirmed by NMR and the content of aloe-emodin was evaluated by UV–Vis absorption spectra. By investigating the structural changes and the variation of average molecular weight (Mn) during the UV-irradiation test, it was found that the aloe-emodin unit could enhance the UV-stability of the polylactide. The molecular weight remained about 80% for aloe-emodin capped PLA after UV irradiation (PLA-E400), while it was only 50% for PLA-C400 without aloe-emodin. A small amount of aloe-emodin could enhance the UV block effect of PLA film. When covered with aloe-emodin functionalized PLA film, the optical damage rate of β-carotene decreased to one-fifth of that for the uncovered one. In addition, aloe-emodin showed little influence on the biodegradation of PLA.
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