Degradable thermally repairable CNTs / PBAT composite fiber and its preparation method and application

By preparing degradable thermally repairable CNTs/PBAT composite fibers, the problems of flexibility and short life of traditional strain sensors are solved, and self-repairing ability and high-efficiency sensing performance are achieved, which is suitable for wearable devices.

CN118932702BActive Publication Date: 2025-09-26ZHEJIANG SCI-TECH UNIV
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Patent Information

Application Number
CN202411099303.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-08-12
Publication Date
2025-09-26
Estimated Expiration
2044-08-12

AI Technical Summary

Technical Problem

Existing strain sensor matrix materials, especially rigid materials, have poor flexibility and are non-degradable, making it difficult to meet the needs of wearable devices. Traditional flexible polymer materials have a short service life, which limits their application in wearable devices.

Method used

Using degradable thermally repairable CNTs/PBAT composite fibers, poly(butylene adipate/terephthalate) PBAT is combined with carbon nanotubes CNTs to prepare a composite fiber with a cross-linked structure. Ultraviolet radiation cross-linking and ultrasonic dispersion technology are used to construct a conductive network to achieve the self-repairing properties of the fiber.

Benefits of technology

The self-repairing ability of flexible strain sensors is realized, which extends the service life, enhances the sensing performance and durability, and expands the application range in wearable devices.

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Abstract

The present invention relates to a degradable, thermally repairable CNTs / PBAT composite fiber, its preparation method, and application. The preparation method comprises the following steps: (1) premixing poly(butylene adipate / terephthalate) (PBAT), triallyl isocyanurate (TAIC), and benzophenone (BP), followed by melt extrusion and ultraviolet radiation crosslinking to obtain a crosslinked PBAT fiber; dispersing carbon nanotubes (CNTs) and sodium dodecyl sulfate (SDS) in a mixture of ethyl acetate and anhydrous ethanol and ultrasonically treating the mixture to obtain a CNTs dispersion; and (2) immersing the crosslinked PBAT fiber in the CNTs dispersion, removing the fiber from the mixture and hanging it to dry, thereby obtaining a thermally repairable CNTs / PBAT composite fiber. The CNTs / PBAT composite fiber of the present invention has the advantages of being degradable, thermally repairable, sensitive, lightweight, small in size, and having a simple manufacturing process.
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