Dynamic polymer material

Abstract

The invention discloses a dynamic polymer material. The dynamic polymer material comprises a product obtained through reaction of the following components: at least one polyol compound containing two or more 1,2-diol motifs or 1,3-diol motifs as well as at least one phenylboronic acid compound containing two or more phenylboronic acid motifs provided with aminomethyl groups in ortho-positions. Dynamic reversible phenylborate bonds are formed through the reaction of the components and then constitute a dynamic cross-linked polymer. The polymer material has reusability and recoverability because of the dynamic reversibility of the special phenylborate bonds; besides, when the polymer material adopting a specific formula receives external force, dynamic bonds break preferentially to have energy dissipation and stress elimination functions, so that the material has good toughness. The material has broad application prospect in the fields of military space equipment, functional paint and coatings, biomimetic materials, biomedical materials and the like.

Description

technical field [0001] The invention relates to the field of intelligent polymer materials, in particular to a polymer material composed of dynamic reversible covalent bonds. Background technique [0002] The progress of material science and technology has greatly promoted the development and progress of human society. Since the beginning of the 20th century, the high-tech group formed by information technology, genetic engineering technology, new energy technology, aerospace technology, nanotechnology, etc. has promoted the rapid development of material science. Traditional single structural materials or functional materials can no longer meet the needs of these rapidly developing high-tech fields, and various multifunctional and intelligent materials have emerged as the times require. Among them, a series of new polymer materials based on dynamic chemistry have shown remarkable development trends. [0003] Dynamic chemistry is an interdisciplinary subject developed by co...

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Problems solved by technology

[0004] However, the breakage and formation process of traditional dynamic covalent bonds is relatively slow, and conditions such as external energy supply or addition of catalysts are still often required, which limits the use environment and application of dynamic polymer materials.

For example, based on the furan-maleimide Diels-Alder cycloaddition reaction product, the dissociation reaction often needs to be carried out at a temperature above 120°C; the dynamic bond dissociation reaction temperature of the alkoxynitrogen group often also reaches 100-130°C, At the same time, the carbon-centered free radicals generated by the dissociation of the alkoxynitrogen group are sensitive to oxygen and high temperature, and the resulting irreversible bonding will affect the performance of the material; the trithioester group needs to be exposed to ultraviolet light. The dynamic exchange reaction can occur; the acylhydrazone bond needs to be acid catalyzed or under high temperature heating conditions to carry out the reversible chain exchange reaction; the disulfide bond in the dynamic covalent bond is a relatively weak bond, which can be carried out under low temperature conditions. Exchange reaction, but the mercaptan itself is less stable, and it will react with the surrounding air to produce continuous oxidation during use, so that the mercaptan content in the reversible system is continuously reduced, which affects the use of materials

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

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