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首页> 外文期刊>Journal of Applied Polymer Science >Photoactivity of Poly(lactic acid) Nanocomposites Modulated by TiO_2 Nanofillers
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Photoactivity of Poly(lactic acid) Nanocomposites Modulated by TiO_2 Nanofillers

机译：TiO_2纳米填料调节聚乳酸纳米复合材料的光活性

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摘要

Photoactivity of poly(lactic acid) (PLA) nanocomposites is of great interest for rational design of products for either short-term/single-use or long-term/durable applications. We prepared PLA/TiO_2 nanocomposite films through a solution mixing/film casting method. Results showed that photodegradability/photostability of PLA could be well modulated by selecting appropriate TiO_2 nanofillers. TiO_2 nanoparticles and nanowires were characterized using X-ray diffraction, UV-Vis-NIR spectrophotometer, and scanning electron microscopy. Changes in color, weight, structure, thermal stability, and phase transitions of PLA and nanocomposite films before and after UV irradiation were evaluated to study photoactivity characteristics. Pure PLA exhibited moderate photodegradability, but the photodegradability and photostability of PLA nanocomposites (PNA) were significantly enhanced by NanoActive (NA) TiO_2 nanoparticles and A type TiO_2 nanowires, respectively. Pure PLA had a weight loss of 27% after 38 days of UV irradiation. The weight loss of photodegradable (PD) PNA (PNA5PLA with 1% NA TiO_2) reached 38%, whereas that of photostable (PS) nanocomposites (P3AW) (P3AW5PLA with 3% A type TiO_2 nanowire) was only 5%. PD PLA exhibited characteristic peaks of carboxylic acid OH stretching and C@C double bond after UV irradiation in Fourier-transform infrared spectra, whereas spectra of PS PLA remained almost the same. Thermal decomposition temperatures, glass transition temperatures, and melting temperatures of PD PLAs decreased dramatically after UV irradiation, but no obvious changes were observed for those of PS PLAs.
机译：聚乳酸（PLA）纳米复合材料的光活性对于短期/一次性使用或长期/耐久应用的产品合理设计引起了极大的兴趣。我们通过溶液混合/成膜方法制备了PLA / TiO_2纳米复合膜。结果表明，通过选择合适的TiO_2纳米填料可以很好地调节PLA的光降解性/光稳定性。使用X射线衍射，UV-Vis-NIR分光光度计和扫描电子显微镜对TiO_2纳米粒子和纳米线进行了表征。评估了紫外线照射前后PLA和纳米复合膜的颜色，重量，结构，热稳定性和相变的变化，以研究光活性特性。纯PLA表现出适度的光降解性，但是纳米活性（NA）TiO_2纳米颗粒和A型TiO_2纳米线分别显着增强了PLA纳米复合材料（PNA）的光降解性和光稳定性。在紫外线照射38天后，纯PLA的重量损失为27％。光降解（PD）PNA（含1％NA TiO_2的PNA5PLA）的重量损失达到38％，而光稳定（PS）纳米复合材料（P3AW）（含3％A型TiO_2纳米线的P3AW5PLA）的重量损失仅为5％。在傅立叶变换红外光谱中，紫外线辐射后，PD PLA表现出羧酸OH拉伸和C @ C双键的特征峰，而PS PLA的光谱几乎保持不变。紫外线照射后，PD PLA的热分解温度，玻璃化转变温度和熔融温度急剧下降，但PS PLA的热分解温度，玻璃化转变温度和熔融温度却没有明显变化。

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