Preparation method and application of polyurethane flexible strain sensor with self-repairing performance

By optimizing the network structure and the ratio of soft to hard segments through dynamic covalent-noncovalent synergistic interaction, a blend of modified carbon nanotubes and polyurethane elastomers was prepared. This solved the problem of insufficient self-healing performance of polyurethane elastomers and realized a flexible polyurethane strain sensor with high efficiency self-healing and excellent mechanical properties, which is suitable for human health monitoring.

CN122356771APending Publication Date: 2026-07-10GUIZHOU HAOYUN HENGTAI NEW MATERIALS TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUIZHOU HAOYUN HENGTAI NEW MATERIALS TECHNOLOGY CO LTD
Filing Date
2026-04-13
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing polyurethane elastomers have insufficient elastic recovery after damage, demanding self-healing conditions, and severe performance degradation, which cannot meet the needs of emerging fields such as flexible electronics and intelligent sensing.

Method used

By designing a network structure with dynamic covalent and non-covalent synergistic effects and optimizing the ratio of soft to hard segments, a blend of modified carbon nanotubes and polyurethane elastomers was prepared to form a polyurethane flexible strain sensor with self-healing properties.

Benefits of technology

This invention achieves a synergistic improvement in the elastic recovery and self-healing properties of polyurethane flexible strain sensors, possessing excellent mechanical properties and sensing capabilities, and is suitable for human health monitoring.

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Abstract

This invention relates to a method for preparing a self-healing polyurethane flexible strain sensor. The self-healing polyurethane flexible strain sensor possesses self-healing capabilities because the polyurethane elastomer network contains a large number of polar groups and dynamic disulfide bonds, which can form strong hydrogen bonds with the polar groups on modified carbon nanotubes, creating a high-density hydrogen bond network. Simultaneously, the modified carbon nanotubes exhibit good compatibility with the polyurethane elastomer, and the itaconic acid and polylactic acid segments possess good biocompatibility. This results in a flexible strain sensor with wide strain detection capabilities and controllable degradation capabilities, and it can also be used to monitor human health and movement, demonstrating great potential in the fields of health monitoring and smart wearable devices.
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