Abstract
Self-healing gels based on reshuffling disulfide bonds have attracted great attention due to their ability to restore structure and mechanical properties after damage. In this work, self-healing gels with different cellulose nanocrystals (CNC) contents were prepared by embedding the thiuram disulfide bonds into gels via polyaddition. By the reshuffling of thiuram disulfide bonds, the CNC-containing gels repair the crack and recover mechanical properties rapidly under visible light in air. The thiuram disulfide-functionalized gels with a CNC content of 2.2% are highly stretchable and can be stretched approximately 42.6 times of their original length. Our results provide useful approaches for the preparation of dynamic CNC-containing gels with implications in many related engineering applications.
Highlights
Self-healing materials have received significant attention because of their ability to restore structure and mechanical properties after damage, which can be applied to various applications such as coatings/sealants, tissue adhesives, and drug/cell delivery [1,2,3,4,5]
cellulose nanocrystals (CNC) were prepared from bamboo pulp by hydrolysis with sulfuric acid
Thethe stress of the samples increases increases up to 2.2%, elongation concentration of CNC
Summary
Self-healing materials have received significant attention because of their ability to restore structure and mechanical properties after damage, which can be applied to various applications such as coatings/sealants, tissue adhesives, and drug/cell delivery [1,2,3,4,5]. Healing agents including cross-linking reactants and catalysts were applied in self-healing systems initially [6]. Upon mechanical damage, these agents, in the encapsulation of nanotubes and microcapsules, were released and subsequently polymerized within the crack so that the damages were fixed [6,7]. Materials using reversible chemical bonds to repair damages in polymeric materials were explored extensively [1,2,3,4,5]. Non-covalent interactions and dynamic covalent bonds were employed in the creation of reversible self-healing systems.
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