聚氨酯
材料科学
乳状液
耐水性
共价键
复合材料
金属
离子强度
粒子(生态学)
高分子化学
化学工程
有机化学
化学
水溶液
地质学
海洋学
冶金
工程类
作者
Guohao Du,Na Li,Qiwen Yong,Feng Jiang,Rui Wang,Yulong Li,Yao Xiao,Jinming Chang
出处
期刊:Soft Materials
[Informa]
日期:2022-08-03
卷期号:20 (4): 471-478
被引量:1
标识
DOI:10.1080/1539445x.2022.2108841
摘要
Covalent crosslinking can improve the water resistance of waterborne polyurethanes (WPUs), but the preparation time of WPUs will be greatly extended by the crosslinking process, and the long-term storage stability of WPU emulsions will decrease because the crosslinked molecular chains cannot disperse in any organic solvents or water. In this paper, a crosslinked WPU was prepared through a post metal-organic crosslinking toward a conventional linear WPU. This post crosslinking is quite fast since it is based on the ionic bond interaction between metal cations and organic anions. The crosslinked WPU emulsion has narrow particle size distribution and small average size, giving rise to excellent long-term storage stability. Additionally, the water absorptions of the crosslinked WPU at 25°C and 60°C are 6.3% and 8.6% respectively, which decrease by 47.9% and 39.4% compared with those of the linear counterpart, indicating that the post metal-organic crosslinking highly improves the water resistance of the WPU. The mechanical strength of the crosslinked WPU also improves compared with the linear WPU.
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