Dynamic polymer and application thereof

Abstract

The invention discloses a dynamic polymer. The dynamic polymer comprises a cyclic organoborate bond produced by a reaction of an organoboric acid element with a monohydroxy element, and an optional supramolecular hydrogen bond, wherein the cyclic organoborate bond exists as a polymeric chain joint and / or cross-linked chain joint for the dynamic polymer and is a necessary condition for the formation or maintenance of the structure of the dynamic polymer. Due to the dynamic reversibility of the cyclic organoborate bond and the optional supramolecular hydrogen bond, the dynamic polymer has self-repairing performance, reusability and recyclability; moreover, the dynamic polymer prepared according to a specific formula has the characteristics of energy dissipation and energy absorption and thefunctions of damping, shock absorption, sound insulation, impact resistance, high toughness and the like based on the dynamic nature of the organoborate bond when the dynamic polymer receives an external force. The dynamic polymer or a composition thereof can be extensively used as an anti-impact damping material, a self-repairing material, a tough material, a force sensor, a sealing material, a sandwich adhesive and the like.

Description

technical field [0001] The invention relates to the field of intelligent polymers, in particular to a dynamic polymer and its application. Background technique [0002] As one of the three pillars (materials, information, and energy) of the current world's new technological revolution, materials together with information technology and energy technology constitute one of the three most important and most promising fields in the world in the 21st century. New materials play an important role in developing high-tech, transforming and upgrading traditional industries, enhancing comprehensive national strength and national defense strength, and are developing faster and faster in the fields of natural science and engineering technology. In recent years, a variety of multifunctional and intelligent materials based on dynamic chemistry have been invented, which greatly promotes the development of new materials. [0003] Dynamic chemistry is an interdisciplinary subject developed ...

AI Technical Summary

Problems solved by technology

[0004] However, due to the poor dynamics of the dynamic covalent bonds contained in traditional dynamic covalent polymers, dynamic polymers need to add catalysts or external energy to accelerate the equilibrium process in order to obtain good dynamic properties. In addition, some dynamic covalent bonds There are certain defects in the actual use process, which limit the use environment and application fields of dynamic polymers

For example, the traditional transesterification reaction is the earliest reversible exchange reaction used by people, but the conditions of the transesterification reaction are relatively harsh, and generally need to be completed under the conditions of adding alkali and reflux. At the same time, the dynamic activity of the traditional ester bond is poor. The application of dynamic polymers constructed by transesterification has limitations; the imine bonds formed by the reaction of primary amines and aldehydes are strongly affected by pH, so such imine bonds must be used within a specific pH range; based on alkoxy The dynamic reversible bond of the nitrogen group often has a dissociation reaction temperature of 100-130°C. At the same time, the carbon-centered free radical generated by the dissociation of the alkoxy nitrogen group is sensitive to oxygen and high temperature, and the resulting irreversible bond will affect the properties of materials; dynamic polymers containing trithioester groups need to undergo dynamic exchange reactions under ultraviolet light or heating conditions; disulfide bonds in dynamic covalent bonds have better dynamics, which can The exchange reaction is carried out under low temperature conditions, but the stability of mercaptan itself is poor. During use, it will react with the surrounding air to produce continuous oxidation, so that the content of mercaptan in the reversible system will continue to decrease, which will affect the use of materials.

The existence of situations such as this makes it difficult for the characteristics of the dynamic covalent bond itself to be fully reflected under normal conditions, and it is necessary to develop a new type of dynamic polymer to solve the above-mentioned problems in the prior art

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