二烯烃橡胶交联网络中可牺牲单元的构筑方法、性能效应和机理

Reinforcing methods and related mechanisms are among the most important and fundamental issues in rubber science and technology. However, current reinforcing methods for rubbers are limited to reinforcement with nanoparticles. In the other side, as the largest kind of rubber, the current applications of diene-based rubbers are essentially limited to engineering rubbers. Sacrificial bonds have been disclosed to be one of the most important structural origins for unusually high strength and toughness of natural materials. In this proposal, the studies on the introduction of sacrificial bonds into crosslinked diene rubber, the impact of sacrificial on rubber performance and related mechanisms are proposed. These studies aim to realize strong rubbers comparable with nanoreinforcement and the functionalities of diene rubbers. The main aspects include: (1) Methods for introducing sacrificial motifs into typical diene rubbers such as butadiene rubber, styrene-butadiene rubber and polyisoprene; (2) Reinforcement/toughening mechanisms of the rubber network with sacrificial bonds; (3) The functional applications of the rubbers with sacrificial bonds in shape memory polymers, damping materials and catalytic carbonization of rubbers. In this proposal, new methods for reinforcing rubbers and expanding the application galleries of diene rubbers are proposed, which are believed to be significant both scientifically and practically.

橡胶的增强方法和机理研究是橡胶科学与技术中最基础和最重要的科学问题之一，但目前增强方法仅限于纳米颗粒增强。另一方面，二烯烃橡胶是用量最大的橡胶，但其应用领域基本局限于工程材料。牺牲键是自然材料具有强韧性的重要结构特征之一。本项目提出二烯烃橡胶交联网络中可牺牲单元的构筑方法、性能效应和机理的研究，旨在获得媲美颗粒增强的强度和拓展二烯烃橡胶的功能应用。主要研究内容包括：（1）典型二烯烃橡胶（顺丁橡胶、丁苯橡胶，聚异戊二烯等）交联网络中引入次价键作为牺牲单元的方法；（2）牺牲键对橡胶增强/增韧的机理；（3）含牺牲键橡胶材料的形状记忆、阻尼和催化成炭等方面的功能应用研究。本项目提出了不依赖纳米颗粒的二烯烃弹性网络强韧化新方法和扩展传统二烯烃橡胶功能应用的新方法，具有重要科学意义和现实意义。

橡胶的增强方法和机理研究是橡胶科学与技术中最基础和最重要的科学问题之一，但之前增强方法仅限于纳米颗粒增强。本项目提出二烯烃橡胶交联网络中可牺牲单元的构筑方法、性能效应和机理的研究，旨在获得媲美颗粒增强的强度和拓展二烯烃橡胶的功能应用。依照项目计划书内容和目标，发展了多种在烯烃橡胶中引入可牺牲单元（包括弱键、短链交联、可牺牲微区）的方法，进一步发展了在动态共价键交联橡胶中引入可牺牲单元的方法、建立了上述体系多层级结构控制和性能调控的方法，制备了一系列具有优异性能（非填充的高强度橡胶、耐疲劳、高阻尼、高强度自修复和可重复加工橡胶）和重要应用价值的新型橡胶材料。本项目提出了不依赖纳米颗粒的二烯烃弹性网络强 韧化新方法和扩展传统二烯烃橡胶功能应用的新方法，具有重要科学意义和现实意义。项目执行期间，在Chem. Soc. Rev., Macromolecules等重要期刊发表SCI论文42篇，申请/获得19项发明专利。