Self-repairable shape memory material and preparation method and recovery method thereof

A technology of memory materials and recycling methods, which is applied in the field of recycling self-repairable shape memory materials, can solve the problems of lack of recyclability and self-repair performance, and achieve the effect of saving raw materials

Inactive Publication Date: 2019-10-01
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Xie Tao's research group discovered that the urethane bond has certain dynamics. This kind of material exhibits good shape memory function, but it does not have recycling performance and self-healing performance.

Method used

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  • Self-repairable shape memory material and preparation method and recovery method thereof
  • Self-repairable shape memory material and preparation method and recovery method thereof
  • Self-repairable shape memory material and preparation method and recovery method thereof

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Embodiment Construction

[0037] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0038] At present, carbamate is usually obtained by the reaction of isocyanate and alcoholic hydroxyl group. Although its carbamate bond is dynamic, its dynamic property is poor, so that the adjustment speed of its crosslinking network becomes relatively slow, and it does not have recycling performance. and self-healing properties. For this reason, the inventor has carried out a large amount of experimental studies to existing carbamate, comprises constantly adjusting the preparation process of carbamate, finds that the dynamic property of the carbamate bond in the prepared product remains the same. Poor, the material cannot automatically repair and heal to its original state after breaking.

[0039] Therefore, the inventors impr...

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Abstract

The invention provides a self-repairing shape memory material and a preparation method and a recovery method thereof. The self-repairing shape memory material comprises a phenyl carbamate bond; the preparation method comprises the following steps of: S1, taking ternary isocyanate and diphenol with a molar ratio of 2: 3, adding a catalyst, mixing uniformly, adding into an internal mixer, and reacting at 60-100 DEG C for 3-6 hours to obtain polyurethane powder I; and S2, hot pressing the polyurethane powder I for 20 to 40 minutes at a pressure of 3 to 5 MPa and a temperature of 110 to 140 DEG Cto obtain the self-repairing shape memory material. The self-repairing shape memory material prepared by the method and prepared by recycling has better self-repairing performance, can be healed againafter fracture, can be repeatedly processed and utilized, and is economical and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a self-repairable shape memory material, a preparation method of the self-repairable shape memory material, and a recovery method of the self-repairable shape memory material. Background technique [0002] The use of smart polymer materials is becoming more and more extensive, and the requirements for them are also getting higher and higher. Materials are often required to have more excellent properties when used, and dynamic covalent cross-linked polymers have a variety of excellent properties and have broad application prospects. The study of dynamically covalently cross-linked polymers has a long history, and its early work focused on how to solve the problem of reducing the mechanical properties of polymer materials caused by stress relaxation. Since the 1990s, the use of dynamic covalent bonds to actively design the special adaptability of polymer networks has gra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/79C08G18/32C08G18/08
CPCC08G18/08C08G18/3215C08G18/792C08G2280/00
Inventor 张彦峰谭继东陈兴幸雷恒鑫崔晨晖马丽
Owner XI AN JIAOTONG UNIV
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