Toughened polybenzoxazine coating matrix with improved comprehensive performance through hydrogen bond tuning with new polyurethanes

Polybenzoxazine has been explored in coating applications because of its excellent properties, including good processability, excellent thermal stability, and large water contact angles, but its toughness must be improved without compromising its other properties. Herein, a new serious of polyuretha...

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Bibliographic Details
Published in:Progress in organic coatings 2023-07, Vol.180, p.107555, Article 107555
Main Authors: Liu, Haolang, Li, Shuiquan, Wang, Meichen, Liu, Huihui, Jiang, Jin, Shao, Shuyang, Wang, Zhi
Format: Article
Language:English
Subjects:
Benzoxazine
Hydrogen bonding
Oil-water separation
Polyurethane
Toughening
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Summary:Polybenzoxazine has been explored in coating applications because of its excellent properties, including good processability, excellent thermal stability, and large water contact angles, but its toughness must be improved without compromising its other properties. Herein, a new serious of polyurethanes with varying numbers of ether groups were synthesized to enhance the toughness of polybenzoxazine via tuning the hydrogen bonds. The curing mechanism, chemical structures, and phase morphology of the blends are discussed. The results show that hydrogen bonding is the main reason for improved properties of the cured products. By varying the hydrogen bond content of the modified system, a champion toughness of 20.4 kJ/m2 without sacrificing processability, thermal stability, and coating performances can be realized, which the char yield is varied between 26.0 % and 28.9 % at 800 °C and corresponding coating hardness and adhesion can reach to 6H and 5B, respectively. Furthermore, the modified system-based coatings exhibit a reversible hydrophobic-hydrophilic state by different stimulus with a champion oil-water separation efficiency of 3379 L·m−2·h−1, illustrating their potential intelligent applications. [Display omitted] •Two new polyurethanes with varying numbers of ether groups are synthesized.•New synthesized polyurethanes modified polybenzoxazines exhibit improved toughness without sacrifice other performances.•The modified blends-based coating has demonstrated its potential application in oil-water separation.
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2023.107555