Journal
POLYMER ENGINEERING AND SCIENCE
Volume 62, Issue 3, Pages 694-704Publisher
WILEY
DOI: 10.1002/pen.25877
Keywords
inorganic organic hybrid material; mechanical property; nanocomposites; self-healing; waterborne polyurethane
Categories
Funding
- International Science and Technology Cooperation Program of Chengdu [2020-GH02-00009-HZ, 2019-GH02-00021-HZ, 2017-GH02-00068-HZ]
- Ministry of Education [SCU2021D005]
- Sichuan University
- Science and Technology Department of Sichuan Province [22ZDYF3307, 2020YFG0071]
- National Natural Science Foundation of China [51903167, 51773129]
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This study proposed a simple method to give waterborne polyurethane materials self-healing properties and improve their mechanical properties by introducing furfuryl-modified silica nanoparticles. The effects of cross-linking density on the properties of nanocomposites were systematically investigated. Qualitative and quantitative studies verified the great self-healing capacity of the nanocomposites, indicating their potential as smart materials.
Endowing waterborne polyurethane (WPU) materials with mechanically reinforced and self-healing property is a pressing issue for expanding practical applications. In this article, we proposed a simple method to give WPU with self-healing properties while improving the mechanical properties. First, furfuryl-modified silica nanoparticles (furan@SiO2) with high functionality and excellent dispersibility were prepared by the sol-gel method. Furan@SiO2 was then introduced into the side-hanging maleimide WPU to form a thermally reversible inorganic-organic network (WMSPUS-x) based on the Diels-Alder reaction. The morphologies and properties of furan@SiO2 and WMSPUS-x emulsions were analyzed by TEM and DLS, demonstrating the excellent dispersion of furan@SiO2 and the storage stability of emulsions. The cross-linking density of the nanocomposites was varied by the furan@SiO2 contents, and the effects of cross-linking density on mechanical and self-healing properties were systematically investigated. In addition, the thermal stability of WMSPUS-x nanocomposites was significantly improved shown by TGA results. Finally, qualitative and quantitative studies of the self-healing process were carried out to verify that WMSPUS-x nanocomposites possess great self-healing capacity. The outcomes indicate that WMSPUS-x nanocomposites have great potential for application as a smart material.
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