全息光聚合物/液晶复合材料是在外场刺激下具有可逆响应行为的高分子有序复合材料。基于硫醇-烯烃点击反应的逐步聚合，具有体积收缩率低、凝胶点单体转化率高、无氧气阻聚的优点，可望取代传统的自由基链式聚合成为构建高性能全息复合材料的主流方法。然而，由于缺乏有效调控的手段，硫醇-烯烃点击反应还难以制备相分离完全、界面结构规整和电光性能优异的全息光聚合物/液晶复合材料。本项目首先合成高模量聚合物单体，再通过单体复配和硫醇-烯烃点击反应构建全息光聚合物/液晶复合材料。研究单体结构对凝胶点单体转化率和复合体系模量的影响规律，为提高复合材料性能提供调控途径。研究光引发/阻聚剂对光聚合动力学、凝胶化行为、相分离行为和电光性能的影响规律，以及上述影响对凝胶点单体转化率和复合体系模量的依赖关系，为制备高性能高分子有序复合材料提供新理论和新方法。在空气环境中存储3D图像，拓展逐步聚合反应在高分子有序复合材料的应用。

Holographic photopolymer/liquid-crystal composites are structurally ordered polymer-based composites that are capable of reversibly responding to external stimuli. The step-growth polymerization involving thiol-ene click reactions, has attractive characteristics including but not limited to low volume shrinkage, high gel point monomer conversion and unique oxygen tolerance, thus is envisioned to be the primary approach that substitutes the traditional radical chain-growth polymerization to reconstruct high performance holographic polymer-based composites. Yet, in lack of effective routes to control the holographic photopolymerization process spatially and temporally, it remains a challenge to fabricate holographic photopolymer/liquid-crystal composites with complete phase separation, uniform interface and desired electro-optic performance through thiol-ene click reactions. We are going to initiate this project by synthesizing a thiol monomer named tetra(2-mercaptoethyl)silane, which has been demonstrated to offer high modulus polymer through thiol-ene click reactions with multifunctional ene monomers. Subsequently, we will mix several different thiol and ene monomers with liquid crystals, and then formulate holographic photopolymer/liquid-crystal composites through photo-triggered thiol-ene click reactions and sequential polymerization induced phase separation. The effect of monomer structure on the gel point monomer conversion and composites’ moduli will be systematically investigated, aiming at providing a tailoring route to enhance the performance of holographic polymer-based composites. Following, a newly disclosed photoinitibitor will be utilized to implement spatiotemporal control over the thiol-ene photopolymerization kinetics, gelation behavior, phase separation and electro-optic performance of holographic photopolymer/liquid-crystal composites, and the dependency of the photoinitibitor’s control capability on the gel point monomer conversion and composites’ moduli during the step-growth polymerization will be illustrated, seeking to afford new theories and novel approaches to formulate high performance holographic polymer-based composites. Finally, we will implement 3D image storage under oxygen atmosphere, for a purpose of advancing the applications of structurally ordered polymer-based composites that are fabricated through step-growth polymerization.