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Title: In-situ incorporation of alkyl-grafted silica into waterborne polyurethane with high solid content for enhanced physical properties of coatings
Authors: Han, YT 
Hu, JL 
Xin, ZY
Issue Date: 2018
Source: Polymers, May 2018, v. 10, no. 5, 514, p. 1-15
Abstract: Waterborne polyurethane (WPU) with high solid content (45%) was obtained by utilizing dimethylol propionic acid (DMPA) and ethoxylated capped polymeric diol as complex hydrophilic groups. Alkyl-grafted silica was incorporated into polymer matrix through in situ polymerization to improve the performance of coatings casted from WPU dispersions. The addition of alkyl-grafted silica enlarged the particle size distribution whilst increased emulsion viscosity, which showed little influence on attainment of high solid content for WPU. The properties of obtained WPU/Silica coatings were investigated. Results showed that the functionalized surface of silica provides good compatibility with the WPU matrix, which promoted the homogeneous dispersion of silica particles. This facilitated the formation of nanosized silica papillae on coatings, contributing to surface roughness and hydrophobicity. Solvent resistance of WPU was enhanced with existence of alkyl-grafted silica particles. The WPU/Silica coatings also displayed improved thermal stability due to the thermal insulation ability and tortuous path effect of silica. Besides this, valid interactions between silica and WPU resulted in hybrid microphase of which the synergistic effect imparted superior mechanical properties at relatively low loadings of silica (2%). The facile technique presented here will provide an effective and promising method for preparing WPU hybrids with enhanced performance.
Keywords: Waterborne polyurethane
Silica
Hybrid
High solid content
Coatings
Microphase
Publisher: Molecular Diversity Preservation International (MDPI)
Journal: Polymers 
ISSN: 2073-4360
DOI: 10.3390/polym10050514
Rights: © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
The following publication Han, Y., Hu, J., & Xin, Z. (2018). In-Situ Incorporation of Alkyl-Grafted Silica into Waterborne Polyurethane with High Solid Content for Enhanced Physical Properties of Coatings. Polymers, 10(5), 514, 1-15 is available at https://dx.doi.org/10.3390/polym10050514
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