| Autor: |
Xu, Guoguang, Liu, Xiao, Lin, Yanqun, He, Guoshan, Wang, Wanjuan, Xiong, Wen, Luo, Haiying, Liu, Zhong, Zhao, Jianhao |
| Předmět: |
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| Zdroj: |
Journal of Applied Polymer Science; Jul2015, Vol. 132 Issue 25, pn/a-N.PAG, 8p |
| Abstrakt: |
ABSTRACT In this study, the thermal hydrolysis of the poly( l-lactic acid) (PLLA) films was investigated for its potential use as a food-packaging ecomaterial. The surface morphology, mass loss, molecular weight, thermal properties, and medium pH were routinely investigated; meanwhile, in particular, the composition and cytotoxicity of the water-soluble degradation products were studied. The changes in the mass loss and molecular weight revealed a random chain-scission mechanism. Differential scanning calorimetry analysis implied that the hydrolysis preferentially took place in the amorphous region. The medium pH decreased with time because of the accumulation of acid water-soluble products in the medium. Liquid chromatography/mass spectrometry analysis proved that these products were composed of 1-13 lactic acid units, in which the content of l-lactic acid increased with time and reached 9.71 mmol/L after hydrolysis for 84 days. The in vitro cell culture indicated that the water-soluble degradation products from the PLLA films had no cytotoxicity to human umbilical vein endothelial cells. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42064. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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