Peng Sixian, Cui Guanghui, Li Jianfeng, Li Fangyi, Ji Maocheng, Zhang Chuanwei, Meng Tianshuo, Li Jianyong, Man Jia
Key Laboratory of High Efficiency and Clean Mechanical Manufacture (Ministry of Education), School of Mechanical Engineering, Shandong University, Jinan 250061, China; National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan 250061, China.
Key Laboratory of High Efficiency and Clean Mechanical Manufacture (Ministry of Education), School of Mechanical Engineering, Shandong University, Jinan 250061, China; National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan 250061, China.
Carbohydr Polym. 2024 Sep 1;339:122296. doi: 10.1016/j.carbpol.2024.122296. Epub 2024 May 20.
The diverse properties reported for starch-based materials indicate their potential for use in the preparation of biodegradable flexible actuators. However, their natural brittleness and lack of durability after modification limit their practical application. Therefore, we propose a strategy for preparing flexible starch-based composites. The results of macro/micro property characterizations and molecular dynamics simulations indicated that using starch, maleic anhydride, and stearic acid (SA), the mobility of the starch chains was enhanced and retrogradation was inhibited through the synergistic effects induced by chain breaking, complex formation with SA, and esterification of the starch molecules. In addition, the elongation at break of the modified starch (MS) reached 2070 %, and considerable ductility (>1000 %) as well as well-complexed structure were maintained after six months. Furthermore, the MS was able to undergo self-healing after fracture or a temperature-controlled stiffness transition. Moreover, it underwent complete degradation in soil within 30 d. Finally, an actuator was prepared by doping the MS with nano-FeO particles to realize a dual magnetic and optical response. Dynamic monitoring was also achieved based on the electrical signal, thereby demonstrating the broad application scope of this material in the development of biodegradable flexible actuators.
报道的淀粉基材料的多种特性表明它们在制备可生物降解柔性致动器方面具有应用潜力。然而，它们的天然脆性以及改性后耐久性的缺乏限制了其实际应用。因此，我们提出了一种制备柔性淀粉基复合材料的策略。宏观/微观性能表征和分子动力学模拟结果表明，使用淀粉、马来酸酐和硬脂酸（SA），通过断链、与SA形成络合物以及淀粉分子的酯化所诱导的协同效应，增强了淀粉链的流动性并抑制了回生。此外，改性淀粉（MS）的断裂伸长率达到2070%，并且在六个月后仍保持相当大的延展性（>1000%）以及良好的复合结构。此外，MS在断裂后或温度控制的刚度转变后能够进行自我修复。而且，它在30天内在土壤中完全降解。最后，通过将MS与纳米FeO颗粒掺杂制备了一种致动器，以实现双磁光响应。还基于电信号实现了动态监测，从而证明了这种材料在可生物降解柔性致动器开发中的广泛应用范围。
