Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 184, Issue -, Pages 9-19Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2021.06.037
Keywords
Chitosan; Self-healing; Biomimetic structure
Funding
- Shandong Provincial Natural Science Foundation [ZR2019QB019, ZR2018MB034, ZR2020ME077]
- National Natural Science Foundation of China [51872150]
- Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, P. R. China, QingChuang Science and Technology Plan Project of Colleges and Universities in Shandong Province [2020KJC005]
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This study developed a self-healed, recyclable, and antimicrobial elastomers material, which showed excellent mechanical properties and antibacterial effects through specific reaction combination.
Inspired by biomaterials with hard and soft structures, we reported a type of self-healed, recyclable and antimicrobial elastomers material (ECTS) which exhibited both strong mechanical strength and high toughness. ECTS was designed by furfuryl amine modified epoxy natural rubber (ENR-FA) and furaldehyde modified chitosan (CTS-FUR) through Diels-Alder (D-A) reaction. The dynamic loading capacity of the chitosan skeleton, the stress ductility of the matrix and the dynamic cross-linking between the hard and soft components gave the elastomer excellent mechanical strength, toughness and self-healing ability. The tensile strength and the elongation at break could reach up to 7.55 MPa and 487%, respectively. In addition, due to the reversibility of the covalent bond between chitosan framework and rubber matrix, the crosslinking network destroyed by external force could be reestablished under high temperature stimulation. The mechanical properties of the sample could be restored to more than 90% of the original sample, whether it was complete fracture, cyclic damage or recyclable. ECTS exhibited excellent antibacterial activity against both gram-positive bacteria (Staphylococcus aureus) and gram-negative bacteria (Pseudomonas aeruginosa), with antibacterial efficiency more than 99%. So, ECTS might has a promising application prospect in medical materials, intelligent devices, 4D-printing, etc.
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