导电膏纸/BOPP复合薄膜的驱动性能

Study on driving performance of conductive paste paper/BOPP composite films

开发多刺激响应、变形速率快、稳定性高的驱动材料需要对材料的成分和结构进行设计。采用旋涂法将导电膏附载在纤维纸上,与双向可拉伸的聚丙烯(BOPP)复合得到导电膏纸/BOPP复合薄膜,并根据纤维纸纹理不同进行裁剪。结果表明:导电膏纸/BOPP复合薄膜在光、湿度刺激下均会发生弯曲变形,且尺寸和纹理角度会影响复合薄膜的驱动行为;按0°纹理裁剪的尺寸为40 mm×8 mm×90μm的复合薄膜,在功率密度为350 mW/cm^2的近红外光刺激下,2.4 s内最大偏转角可达到128.3°,刺激消失后可在11.2 s内能恢复至初始状态;该复合薄膜在30%至90%的相对湿度刺激下,在85.6 s内最大偏转角为147.8°,复合薄膜的灵敏度约为2.5°/RH。该复合薄膜在光、湿刺激下均呈现出良好的稳定性和重现性,有望用于软体驱动器或光、湿响应型智能器件。

The development of driving materials with multi-stimulus response, fast deformation rate and high stability requires the design of material composition and structure. In this paper, the conductive paste was loaded on the fiber paper by spin coating method, and compounded with biaxially-oriented polypropylene(BOPP) to obtain conductive paste paper/BOPP composite film which was further cut according to different textures of fiber paper. The experimental results show that the conductive paste paper/BOPP composite film could bend and deform under light and moist stimulation, and the size and texture angle would affect the driving behavior of the composite film. Under the stimulation of near infrared light with a power density of 350 mW/cm^2, the maximum deflection angle of the composite film with a size of 40 mm×8 mm×90 μm cut according to 0° texture could reach 128.3° in 2.4 s. After the stimulus disappeared, it could return to its initial state within 11.2 s. The composite film reached a maximum deflection angle of 147.8° in 85.6 s under the stimulation of 30% to 90% relative humidity, and the sensitivity of the composite film was about 2.5°/RH. The composite film shows good stability and reproducibility under light and moist stimulation, and is expected to be applied in soft drivers or intelligent devices with light and moist response.