Superhydrophobic film from silicone-modified nanocellulose and waterborne polyurethane through simple sanding process

Xun Zhan; Jian Chen; Zhaozhe Yang; Guomin Wu; Zhenwu Kong

doi:10.1016/j.ijbiomac.2023.123431

Superhydrophobic film from silicone-modified nanocellulose and waterborne polyurethane through simple sanding process

Int J Biol Macromol. 2023 Mar 31:232:123431. doi: 10.1016/j.ijbiomac.2023.123431. Epub 2023 Jan 24.

Authors

Xun Zhan¹, Jian Chen¹, Zhaozhe Yang¹, Guomin Wu², Zhenwu Kong¹

Affiliations

¹ Institute of Chemical Industry of Forest Products Chinese Academy of Forestry, Key Laboratory of Biomass Energy and Material Jiangsu Province, Key Laboratory of Chemical Engineering of Forest Products National Forestry and Grassland Administration, National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass, Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing 210042, Jiangsu, China.
² Institute of Chemical Industry of Forest Products Chinese Academy of Forestry, Key Laboratory of Biomass Energy and Material Jiangsu Province, Key Laboratory of Chemical Engineering of Forest Products National Forestry and Grassland Administration, National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass, Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing 210042, Jiangsu, China. Electronic address: woogm@hotmail.com.

PMID: 36702039
DOI: 10.1016/j.ijbiomac.2023.123431

Abstract

How to improve the water and pollution resistance of films has been a major stumbling block in applications of waterborne coatings. To solve this problem, a new strategy was developed to construct waterborne superhydrophobic polyurethane composite films by modifying cellulose nanocrystal (CNC) with polysiloxane and doping the modified CNC into waterborne polyurethane (WPU). The super-hydrophobic functionalization with a water contact angle >150° was achieved by simple sanding. The effects of CNC on the morphology, thermal, mechanical, and hydrophobic properties of the obtained superhydrophobic composite films were investigated. The simple sanding process formed a large number of rough porous structures on the surface of the film, which improved the superhydrophobic properties of the film. And after 30 sanding cycles, the film still had excellent hydrophobicity (water contact angle >150°). This easy and effective method for the preparation of superhydrophobic films has great practical application value in the area of waterborne coatings.

Keywords: Cellulose nanocrystal; Sanding; Silicone; Superhydrophobic; Waterborne polyurethane.

MeSH terms

Hydrophobic and Hydrophilic Interactions
Polyurethanes* / chemistry
Sand*
Silicones
Water / chemistry

Substances

Polyurethanes
Sand
Silicones
Water