Force-induced responsive polymer with multi-hybrid network structure

Abstract

The invention discloses a force-induced responsive polymer with a multi-hybrid network structure. The force-induced responsive polymer contains at least two cross-linked networks and also contains non-dynamic covalent bond covalent cross-linking and non-covalent cross-linking at the same time, and the cross-linking degree of the non-dynamic covalent bond covalent cross-linking in at least one cross-linked network is above a gel point; wherein the cross-linked network contains at least one force-sensitive group; under the action of mechanical force, the force-sensitive group is subjected to chemical and / or physical changes, and force-induced response is achieved. The multi-hybrid network structure provides excellent structural stability and mechanical properties for the polymer; based on the force-induced responsiveness of the force-sensitive group, the monitoring and warning effects on the stress, deformation, damage and failure processes are obtained; and non-covalent dynamics may provide self-repairing performance. The force-induced responsive polymer can be applied to a stress sensing material, a self-repairing material, a tough material, a shape memory material, a toy material,a functional coating material, an intelligent sensor, a binding material, a plugging material and the like.

Description

technical field [0001] The present invention relates to a mechanoresponsive polymer and a method for realizing the mechanoresponse, in particular to a mechanoresponsive polymer having a heterogeneous network structure and containing at least one mechanosensitive group and realizing the mechanoresponse A Mechanotropic Response Approach for Responsive Polymers. Background technique [0002] Polymer cross-linking is an important factor to obtain good mechanical strength and structural stability. The cross-linking effect includes physical cross-linking and chemical cross-linking. Traditional cross-linked polymer materials usually only contain a single cross-linked network structure, which in a certain However, for polymers that only contain physical crosslinks, the bonding is relatively weak and shows a certain degree of reversibility, which can increase the toughness, tear resistance, fatigue resistance and self-repair of the material. performance, etc., but it is precisely be...

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Problems solved by technology

[0002] Polymer cross-linking is an important factor to obtain good mechanical strength and structural stability. The cross-linking effect includes physical cross-linking and chemical cross-linking. Traditional cross-linked polymer materials usually only contain a single cross-linked network structure, which in a certain However, for polymers that only contain physical crosslinks, the bonding is relatively weak and shows a certain degree of reversibility, which can increase the toughness, tear resistance, fatigue resistance and self-repair of the material. performance, etc., but it is precisely because of the reversibility of this cross-linked structure that it is easily affected by the external environment, such as acid resistance, alkali resistance, salt ion resistance, temperature resistance, etc., and cannot provide long-term stability.

Although traditional chemical cross-linked polymers can maintain high mechanical strength and long-term use stability, due to the strong bonding effect of their structure, the toughness of the material is poor, and silver cracks / microcracks are generated inside the material, which cannot effectively prevents it from expanding, and cannot achieve self-healing properties after damage to the material

In addition, traditional cross-linked polymer materials are not responsive to mechanical force, and can only be observed and detected when the mechanical force reaches the fracture threshold of the chemically connected structure and produces microcracks / cracks, which cannot be used for stress and deformation of the material. , damage and failure processes provide monitoring and warning functions, and cannot effectively repair structural damage

[0003] At present, most mechanoresponsive polymers require high stress / strain for mechanoresponse, and the mechanoresponse process can only occur after the material fails, which cannot really give full play to the effective early warning of material structure damage. The practical significance of improving the safety of materials is not great; and most mechanoresponsive polymers contain only one mechanoresponsive structural component, and the mechanoresponse effect is single, which also greatly limits its application

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