Boron nitride nanosheets reinforced waterborne polyurethane coatings for improving corrosion resistance and antifriction properties. (July 2018)

• Record Type: Journal Article
• Authors: Li, Jing; Gan, Lingzhu; Liu, Yuchen; Mateti, Srikanth; Lei, Weiwei; Chen, Ying; Yang, Junhe
• Is Part Of: European polymer journal. Volume 104(2018)
• Page Start: 57
• Page End: 63
• Publication Date: 2018-07
• Subjects: Composite coatings -- Boron nitride nanosheet -- Antifriction -- Corrosion protection; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; Polymerization; Polymers; Periodicals; Electronic journals; 547.705
• DOI: 10.1016/j.eurpolymj.2018.04.042
• Languages: English
• ISSNs: 0014-3057

Abstract

Graphical abstract: Highlights: Boron nitride nanosheets reinforced waterborne polyurethane coatings were fabricated. The corrosion protection and antifriction properties of the coatings were improved. The surface functionalization of boron nitride was necessary to obtain uniform dispersion. Abstract: Effective corrosion resistance and antifriction properties can prolong the durability of coatings. We demonstrate that hexagonal boron nitride (BN) nanosheets can be employed as the reinforcement in waterborne polyurethane (PU)-matrix composite coatings and lead to a significant improvement in their corrosion protection properties. The impedance modulus at 0.1 Hz dropped from 10 9 Ω·cm 2 to 10 8 Ω·cm 2 for 2% BN/PU coatings after 114 h immersion in 3.5 wt% NaCl electrolyte, while it dropped from 10 8 Ω·cm 2 to 5 × 10 6 Ω·cm 2 for neat PU coatings. The dynamic friction coefficient was decreased for 22.6% with the addition of 2 wt% BN in the PU composite coatings at 100 °C. The morphologies of the coating surfaces showed less abrasion than neat PU after the test. The major challenge of preparing BN/PU composite coatings was the dispersion of BN nanosheets in the waterborne polymer, which was solved by functionalization of BN nanosheets with hydroxyl groups.