Zhou Yuyang, Deng Peng, Chen Wei
National Engineering Laboratory for Modern Silk, National Textile and Apparel Council Key Laboratory of Natural Dyes, Jiangsu Engineering Research Center of Textile Dyeing and Printing for Energy Conservation, Discharge Reduction and Cleaner Production, College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, China.
School of Art, Soochow University, Suzhou 215123, China.
Materials (Basel). 2024 Jul 28;17(15):3734. doi: 10.3390/ma17153734.
There is a significant trend towards the integration of natural substances with bio-polymers for fully bio-based functional composites. Polylactic acid is regarded as a promising biodegradable polymer for replacing synthetic polymers. Differing from the case of natural fiber, the incompatibility of polylactic acid with bio-based molecules prevents it from being used to fabricate high-quality sustainable composites. This work presents a simultaneous ultraviolet shielding and antibacterial finishing process of polylactic acid combined with bioactive baicalin and an eco-friendly ester, which is highlighted for (a) the lack of synthetic chemicals involved in such process, (b) adsorption enhancement achieved at a mild temperature, and (c) marginal color change on treated polylactic acid. A response surface methodology was adopted to analyze the impacts of various factors on the baicalin quantity in polylactic acid, and to optimize the treatment condition. The uptake ratio of baicalin in polylactic acid was drastically promoted from 8.5 mg/g to 21.1 mg/g using methyl cinnamate. The response surface methodology based on a central composite design experiment indicated that the usage of baicalin was the most significant factor followed by methyl cinnamate and temperature. After optimization, a very faint color depth of 1.2 was apparent, but UPF 50+ and 92% bacterial reduction could be achieved. In all, the success in strengthening of the functionalities of polylactic acid extends the applications of polylactic acid products.
将天然物质与生物聚合物结合以制备完全基于生物的功能复合材料，这一趋势十分显著。聚乳酸被视为一种有前景的可生物降解聚合物，有望取代合成聚合物。与天然纤维的情况不同，聚乳酸与生物基分子的不相容性使其无法用于制造高质量的可持续复合材料。这项工作展示了一种聚乳酸与生物活性黄芩苷和一种环保酯相结合的同时具备紫外线屏蔽和抗菌整理的工艺，该工艺的亮点在于：（a）此过程不涉及合成化学品；（b）在温和温度下实现了吸附增强；（c）处理后的聚乳酸颜色变化极小。采用响应面法分析了各种因素对聚乳酸中黄芩苷含量的影响，并对处理条件进行了优化。使用肉桂酸甲酯时，聚乳酸中黄芩苷的摄取率从8.5毫克/克大幅提高到21.1毫克/克。基于中心复合设计实验的响应面法表明，黄芩苷的用量是最显著的因素，其次是肉桂酸甲酯和温度。优化后，颜色深度仅为非常浅的1.2，但可实现UPF 50+以及92%的细菌减少率。总之，聚乳酸功能强化的成功拓展了聚乳酸产品的应用。
