Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 18, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202100211
Keywords
down/up-conversion fluorescence responsiveness; polyurethane elastomers; screen-printing; self-healing
Categories
Funding
- Natural Science Foundation of Hubei Province for Distinguished Young Scholars [2019CFA056]
- Fundamental Research Funds for the Central Universities [2042018kf203]
- Wuhan University
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The study synthesized a self-healing elastomer that can emit blue fluorescence under UV excitation, and successfully prepared a series of dual-mode fluorescence patterns. The new material has good mechanical properties and self-healing ability, providing important guidance for the development and application of smart materials.
Expanding the practical application range of self-healing materials has become an important challenge for developing smart materials. Herein, the synthesis of printable, triple-mode fluorescence responsive, and colorless self-healing elastomers, formed by the combination of disulfide cross-linked polyurethane (PU) polymers, carbon dots (CDs) down-conversion fluorescence materials, and lanthanide ions doped upconversion fluorescence materials. The PU elastomers with optimal mechanical properties and good restorability (recover large strain of 500% after relaxation at room temperature (R.T.) for 2 h) are selected to incorporate CDs for fabricating fluorescence responsive elastomers (denoted as PU-CDs). Significantly, the prepared PU-CDs exhibit not only superior tensile strength and toughness (20.95 MPa and 85.13MJ m(-3), respectively) than the previously reported R.T. self-healing elastomers but also show good self-healing properties and achieve blue fluorescence emissions under the ultraviolet excitation. Furthermore, a series of dual-mode fluorescence patterns based on formulated core@shell structural upconversion inks are prepared on the transparent PU-CDs elastomers by a directly screen-printing method. Self-healing and integrating a series of fluorescence patterns and damaged electrical patterns can also be accomplished successfully. The designed self-healing materials provide new ideas and important guidance for developing and applying the next generation of smart materials.
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