金属配位物理交联水凝胶的强韧化、结构化和可控变形研究

基于前期工作基础，申请人拟开展"金属配位物理交联水凝胶的强韧化、结构化和可控变形研究"，时间为2021年1月至2014年12月。本项目以基于金属配位的物理交联水凝胶为研究对象，对该类物理交联水凝胶的大变形、粘弹性以及粘弹性所导致的率相关性和迟滞效应进行实验和理论研究，建立蕴含配位交联键解离、重连动力学及高分子网络构象变化等微观机制的本构理论，并定量描述该类凝胶的断裂、疲劳及自修复性能，揭示其能量耗散机制和强韧化机制。通过对材料在不同环境因素下的形性控制，研究其打印成型机理，为该材料体系与多种智能软材料的复合打印提供实验和理论依据。研究软材料/柔性结构复合体及其界面的大变形变构和力-热-光-盐-磁多场耦合行为，发展外场激励下材料和结构的精准可控变形及其调控方法。为金属配位物理交联水凝胶的设计制备及实际应用提供理论基础和方法支持。预期项目期间发表高质量学术论文8篇。

Based on the previous studies on related topics, the applicant proposes to work on the toughening, structuring and controllable deformation of physical hydrogels with dynamic metal-coordinated bonds. A central paradigm of this project is the combination of theoretical modeling and experimental measurements, to establish the constitutive model with the coupling between large deformation and pronounced rate-dependent viscoelasticity. The constitutive theory incorporates two main physical mechanisms: the microscopic kinetic dissociation/association of cross-links and inelastic conformational changes of gel networks. The work aims to simultaneously capture the time-dependent stress response, self-healing, fatigue as well as ultimate failure, and to uncover the mechanisms of energy dissipation and material toughening. This project will investigate the morphology-property regulation of the gel under different stimuli, paving the way for the 3D-printed composites/constructs using the mentioned gel and other soft materials. Also, this project will develop the precise and controllable deformation of gel composites through the coupling between deformation and externally imposed stimuli, such as temperature, optical, magnetic fields. These studies should provide theoretical guidance and methodological support for the design, synthesis and practical applications of the gel. The applicant expects to publish 8 papers in top-tier journals within this 4-year project.