三醋酸纤维素及其光学薄膜的构效关系

三醋酸纤维素膜平滑性极高、光学特性优良，尺寸稳定性好，是不可替代的显示器偏振片保护膜材料。偏振片保护膜材料除要求具有一定的物理机械性能和严格的光学特性，如低雾度值和高透光率外，还特别要求光学的各向同性，即尽可能小的双折射。膜的本征双折射受酯基种类、数量、取代点位和构象的影响，它们之间的关系还需进一步明确。因此，研究纤维素酯分子结构与光学性质的构效关系，设计加工高性能光学薄膜具有重要的理论意义和实用价值。. 纤维素的区域选择性反应是一项有挑战的工作，需要借助新的反应介质和合成手段，通过分子设计，控制合成，才能达到预期效果的目标产物。本项目拟利用离子液体中的均相反应，借助实验分析、分子建模和理论计算，探索纤维素选择性酯化和水解的机理，弄清楚三醋酸纤维素及其光学薄膜的构效关系，构建零双折射分子理论。通过设计控制酯化点位和单体组成，突破光学纤维素酯本征双折射不易控制这一技术瓶颈。

Cellulose triacetate film has high smoothness, excellent optical properties and good dimensional stability. It is an irreplaceable polarizing film material for display. In addition to certain physical and mechanical properties and strict optical properties, such as low haze value and high transmittance, polarizer protective film materials also require special optical isotropy, that is, the smallest possible birefringence. The intrinsic birefringence of the membrane is affected by the type, number, substitution and conformation of ester groups. Therefore, it is of great theoretical and practical significance to study the structure-activity relationship between molecular structure and optical properties of cellulose ester and to design and process high-performance optical films.. The region-selective reaction of cellulose is a challenging work, which requires the help of new reaction media and synthesis methods, through molecular design, control synthesis, to achieve the desired effect of the target product. This project intends to explore the mechanism of selective esterification and hydrolysis of cellulose, clarify the structure-activity relationship between cellulose triacetate and its optical films, and construct the molecular theory of zero birefringence by using the homogeneous reaction in ionic liquid, by means of experimental analysis, molecular modeling and theoretical calculation. Through the design and control of the esterification point and monomer composition, the technical bottleneck that the intrinsic birefringence of optical cellulose ester is not easy to control is broken through.