Institute of Polymer Science and Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
Liaoning Provincial Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials, Liaoning University, Shenyang 110036, China.
ACS Macro Lett. 2022 May 17;11(5):657-662. doi: 10.1021/acsmacrolett.2c00139. Epub 2022 Apr 26.
Poly(lactic acid) (PLA), one of the most promising biodegradable polymer products, has achieved wide applications for its relatively good mechanical properties and moderate degradability. Here we report an environment-friendly filler, the organic-inorganic composite Janus nanosheets (PLA/PBS JNs), which can jam at the interface of the PLA/PBS blend with a low threshold as the compatibilizer and can simultaneously toughen the composites and improve the gas barrier performance due to better interfacial interaction and tortuous path effect. With 0.3 wt % of PLA/PBS JNs added, the tensile strength and elongation at break of the PLA/PBS blend can be improved by 37% and 224%, respectively. After a further hot-pressing process, the barrier performance of the PLA/PBS composite membranes can be significantly enhanced since PLA, PLA/PBS JNs, and PBS are arranged in a nearly lamellar structure with oxygen permeability of 0.63 × 10 cm cm·cm s Pa with only 0.5 wt % of PLA/PBS JNs.
聚乳酸（PLA）是最有前途的可生物降解聚合物产品之一，因其具有相对较好的机械性能和适中的可降解性而得到了广泛的应用。在这里，我们报告了一种环保型填充剂，即有机-无机复合 Janus 纳米片（PLA/PBS JNs），它可以作为增容剂在 PLA/PBS 共混物的界面处形成堵塞，并且由于更好的界面相互作用和曲折路径效应，同时可以增强复合材料的韧性并提高气体阻隔性能。添加 0.3wt%的 PLA/PBS JNs 后，PLA/PBS 共混物的拉伸强度和断裂伸长率分别提高了 37%和 224%。经过进一步的热压处理，由于 PLA、PLA/PBS JNs 和 PBS 以近乎层状结构排列，氧气透过率为 0.63×10 cm cm·cm s Pa，仅添加 0.5wt%的 PLA/PBS JNs，PLA/PBS 复合膜的阻隔性能可以得到显著提高。
