State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
Carbohydr Polym. 2020 Feb 15;230:115676. doi: 10.1016/j.carbpol.2019.115676. Epub 2019 Nov 26.
Light-induced shape-memory polymer (LSMP) materials have advantages of remote control and precise stimulation under suitable photoactive factors. The excellent performance, stability, and low cost are significant for LSMP materials. Herein, a novel stable and cheap LSMP was prepared with polyurethane (PU) and copper sulfide nanoparticles (CuS NPs) supported on modified cellulose nanocrystals (MCNC) (CuS NPs@MCNC). For the photosensitivity, CuS NPs were formed and assembled on MCNC without other additives. These prepared LSMP films exhibited good light-induced shape memory, which was ascribed to the highly photothermal effect of CuS NPs. We found that the shape recovery ratio was 97.4 % when the PU nanocomposite film containing 0.2 wt.% CuS NPs@MCNC was irradiated by near-infrared (NIR) for 21 s. The ratio was still over 85.7 % after five times of repeat test. These LSMPs contained CuS NPs@MCNC have potential to be applied as a prospective material for medical devices and new packaging.
光致形状记忆聚合物（LSMP）材料在适当的光活性因子下具有远程控制和精确刺激的优点。出色的性能、稳定性和低成本对 LSMP 材料具有重要意义。在此，我们使用聚氨酯（PU）和负载在改性纤维素纳米晶体（MCNC）上的硫化铜纳米颗粒（CuS NPs）（CuS NPs@MCNC）制备了一种新型的稳定且廉价的 LSMP。就光敏感性而言，在没有其他添加剂的情况下，CuS NPs 在 MCNC 上形成并组装。这些制备的 LSMP 薄膜表现出良好的光致形状记忆性能，这归因于 CuS NPs 的高热光效应。我们发现，当含有 0.2wt.%CuS NPs@MCNC 的 PU 纳米复合材料薄膜用近红外（NIR）光照射 21 秒时，形状回复率为 97.4%。经过五次重复测试后，该比例仍超过 85.7%。这些含有 CuS NPs@MCNC 的 LSMP 有望成为医疗器械和新型包装的有前途的材料。
