Kulkarni Onkar, Enriquez-Cabrera Alejandro, Yang Xinyu, Foncy Julie, Nicu Liviu, Molnár Gábor, Salmon Lionel
Laboratoire de Chimie de Coordination (LCC), Centre National de la Recherche Scientifique (CNRS), University of Toulouse, 205 Route de Narbonne, 31077 Toulouse, France.
Laboratoire d'Analyse et d'Architecture des Systèmes (LAAS), Centre National de la Recherche Scientifique (CNRS), University of Toulouse, 7 Avenue du Colonel Roche, 31400 Toulouse, France.
Nanomaterials (Basel). 2024 Jul 24;14(15):1243. doi: 10.3390/nano14151243.
We used stereolithography to print polymer nanocomposite samples of stimuli-responsive spin crossover materials in the commercial photo-curable printing resins DS3000 and PEGDA-250. The thermomechanical analysis of the SLA-printed objects revealed not only the expected reinforcement of the polymer resins by the introduction of the stiffer SCO particles, but also a significant mechanical damping, as well as a sizeable linear strain around the spin transition temperatures. For the highest accessible loads (ca. 13-15 vol.%) we measured transformation strains in the range of 1.2-1.5%, giving rise to peaks in the coefficient of thermal expansion as high as 10 °C, which was exploited in 3D printed bilayer actuators to produce bending movement. The results pave the way for integrating these advanced stimuli-responsive composites into mechanical actuators and 4D printing applications.
我们使用立体光刻技术，在商用光固化打印树脂DS3000和PEGDA - 250中打印刺激响应性自旋交叉材料的聚合物纳米复合材料样品。对立体光刻打印物体的热机械分析表明，通过引入更硬的自旋交叉颗粒，不仅聚合物树脂得到了预期的增强，而且还具有显著的机械阻尼，以及在自旋转变温度附近相当大的线性应变。对于最高可达负载（约13 - 15体积%），我们测量到的转变应变在1.2 - 1.5%范围内，导致热膨胀系数峰值高达10℃，这被用于3D打印双层致动器以产生弯曲运动。这些结果为将这些先进的刺激响应性复合材料集成到机械致动器和4D打印应用中铺平了道路。
