Yin Jiajia, Hui Haohao, Fan Bin, Bian Jiang, Du Junfeng, Yang Hu
Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China.
Laser Fusion Research Center, China Academy of Engineering Physics, Chengdu 610200, China.
Membranes (Basel). 2022 Jun 3;12(6):592. doi: 10.3390/membranes12060592.
Polyimide membranes have excellent physiochemical properties which make them valuable materials for optical area. However, common aromatic polyimide membrane trend to show low transmittance in visible region because of the charge-transfer complex (CTC) in molecular structures. Moreover, it's trending to show high moisture uptakes because of the hydrophilic imide rings in molecular structure. In this work, a polyimide composite membrane with SiO antireflective membrane on both sides was prepared. High transmittance (93% within 500~800 nm) and surface hydrophobicity was realized simultaneously. The polyimide composite membrane showed great optical homogeneity. The SiO antireflective membranes on polyimide substrate were prepared through a simple and efficient sol-gel method. The surface roughness of polyimide membrane substrate on each side has been improved to 1.56 nm and 3.14 nm, respectively. Moreover, the excellent thermal stability and mechanical property of polyimide membrane has been preserved, which greatly improves the range of applications for the composite membrane. It is a good candidate for light weight optical system.
聚酰亚胺膜具有优异的物理化学性质，这使其成为光学领域有价值的材料。然而，由于分子结构中的电荷转移络合物（CTC），普通的芳香族聚酰亚胺膜在可见光区域往往表现出低透过率。此外，由于分子结构中存在亲水性酰亚胺环，其吸湿率也往往较高。在这项工作中，制备了一种两侧带有SiO抗反射膜的聚酰亚胺复合膜。同时实现了高透过率（在500~800nm范围内为93%）和表面疏水性。聚酰亚胺复合膜表现出良好的光学均匀性。通过简单高效的溶胶-凝胶法在聚酰亚胺基底上制备了SiO抗反射膜。聚酰亚胺膜基底两侧的表面粗糙度分别提高到了1.56nm和3.14nm。此外，聚酰亚胺膜优异的热稳定性和机械性能得以保留，这大大拓宽了复合膜的应用范围。它是轻质光学系统的理想候选材料。
