Effect of TiO₂ nanoparticles on the long-term hydrolytic degradation behavior of PLA

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• 作者：Yan-Bing Luo^a ; ^b ; Xiu-Li Wang^a ; Yu-Zhong Wang^a ; ^{yzwang@scu.edu.cn}
• 关键词：PLA ; TiO2 ; Nanocomposites ; Hydrolysis ; Degradation
• 刊名：Polymer Degradation and Stability
• 出版年：2012
• 期刊代码：85_01413910
• 类别：ms
• 出版时间：May, 2012
• 卷：97
• 期：5
• 页码：721-728
• 文件大小：2047 K

摘要

The longer-than-one-year hydrolytic degradation of poly (lactic acid) (PLA)/TiO₂ nanocomposites was investigated in phosphate buffer solution of pH 7.4 at 37聽掳C so as to elucidate the effect of nanofillers on the degradation characteristics of PLA. The temporal changes in appearance, water absorption, number-average molecular weight (Mn), glass transition temperature, melting temperature, and crystallinity of the samples were traced. The results showed that the heterogeneous degradation and bulk-erosion were general mechanisms for PLA and its TiO₂ nanocomposites. The change in surface morphology and molecular weight after hydrolysis revealed that the hydrolysis of nanocomposites occurred at the interface of PLA matrix and nanofillers, and the degradation rate was accelerated by the addition of the TiO₂ nanofillers. The dispersion of nanofillers in polymer matrix affected the water absorption and degradation rate. The rapid increase of crystallinity also affected the degradation rate of nanocomposites. The present study suggested that the hydrolyzability of PLA could be controlled by adding TiO₂ nanoparticles.