To read the full version of this content please select one of the options below:

Preparation and characterization of polyurethane–silica hybrid films

Junrui Zhang (Zhijiang College of Zhejiang University of Technology, Shaoxing, China)
Guojun Jiang (Zhijiang College of Zhejiang University of Technology, Shaoxing, China)
Tianhao Huang (Zhijiang College of Zhejiang University of Technology, Shaoxing, China)
Jun Xie (Zhijiang College of Zhejiang University of Technology, Shaoxing, China)
Da Shi (Zhijiang College of Zhejiang University of Technology, Shaoxing, China)

Pigment & Resin Technology

ISSN: 0369-9420

Article publication date: 12 August 2019

Issue publication date: 21 August 2019

Abstract

Purpose

The paper aims to provide a facile approach to the synthesis of polyurethane–silica nanocomposites by introducing self-made aqueous silica sols with different particle sizes into polyurethane materials. This paper investigates the effects of the silica nanoparticles on the polyester polyol, as well as the physical properties and transmittance of the hybrid polyurethane coatings.

Design/methodology/approach

Colloidal silica particles of different sizes were obtained using a sol–gel process and were then embedded into polyester polyol by in-situ polymerization. These polyester polyol–silica resins were synthesized using an azeotrope process, using xylene to remove the water generated in the system and present in the dispersion medium for the colloidal silica. The polyester polyol–silica resins were further cured using isocyanate trimers to form polyurethane–silica hybrid films.

Findings

The paper observed that the viscosity of the polyester polyol–silica nanocomposite resins increased and their appearance changed from transparent to ivory white as the particle size of the added silica was increased. It was found that increasing the hydroxyl content of the silica improved the film transmittance in the visible light region. However, the transmittance decreased sharply once the diameter of the silica particles reached 100 nm.

Research limitations/implications

Because of the limitation of experimental conditions, some performances have not been tested. Therefore, researchers are encouraged to conduct further tests.

Practical implications

The paper provides a method of preparing hybrid polyurethane film by using silica; the results indicate that the introduction of nano-silica can improve the wear resistance and glass transition temperature of polyurethane coatings.

Originality/value

The results obtained in this study will be extremely useful to enhance the understanding of organic–inorganic hybrid materials.

Keywords

Acknowledgements

This research was supported by Zhejiang Provincial Natural Science Foundation of China (LQ18E030014, LQ18E030013 and LQ14E030004) and the National Natural Science Foundation of China (21504079).

Citation

Zhang, J., Jiang, G., Huang, T., Xie, J. and Shi, D. (2019), "Preparation and characterization of polyurethane–silica hybrid films", Pigment & Resin Technology, Vol. 48 No. 5, pp. 357-362. https://doi.org/10.1108/PRT-03-2019-0029

Publisher

:

Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited