File(s) under permanent embargo

Boron nitride nanosheets reinforced waterborne polyurethane coatings for improving corrosion resistance and antifriction properties

journal contribution
posted on 01.07.2018, 00:00 authored by J Li, L Gan, Yuchen LiuYuchen Liu, Srikanth MatetiSrikanth Mateti, Weiwei LeiWeiwei Lei, Ying (Ian) ChenYing (Ian) Chen, J Yang
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 109Ω·cm2to 108Ω·cm2for 2% BN/PU coatings after 114 h immersion in 3.5 wt% NaCl electrolyte, while it dropped from 108Ω·cm2to 5 × 106Ω·cm2for 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.

History

Journal

European polymer journal

Volume

104

Pagination

57 - 63

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0014-3057

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2018, Elsevier