Effects of alumina hollow microspheres on the properties of water-borne polyurethane films
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ARTICLE Effects of alumina hollow microspheres on the properties of water-borne polyurethane films Wenjie Zhu, Yuan Cui, Chongjing Li, Zhuo Ma, Xinliang Li, Meikang Han, Laifei Cheng, and Xiaowei Yina) Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an 710072, China (Received 18 March 2018; accepted 28 June 2018)
Water-based polyurethane/alumina hollow microsphere (WPU-hAl2O3) composite films were prepared via a facile spin coating method. The pristine WPU, as the matrix of the composite films, was tailor-made by hAl2O3 with the diameter of 2–5 lm to improve the mechanical and physical properties of the films. The hardness, surface morphology, infrared emissivity, wettability, and light transmittance of the WPU-hAl2O3 films with different hAl2O3 contents were investigated. The results indicate that the Vickers hardness, coefficient of friction, infrared emissivity at the wavelength of 2–22 lm, and wetting angle of the WPU-hAl2O3 films (30 wt%) increased by 53.6%, 51.7%, 21.1%, and 19.0%, respectively, compared with the pristine WPU films. Meanwhile, with the rising of hAl2O3 content, the light transmittance decreased by 75.3% at the wavelength of 400–800 nm. This work not only designs a kind of lightweight multifunctional composite film but also provides an effective route for extending further applications of hAl2O3 in the field of composite films.
I. INTRODUCTION
In the past decade, multifunctional films combining environmental protection and economic issues are widely studied since the limitation of single-function films in the new generation film industry.1,2 Especially for construction and conveyance whose surfaces are directly exposed to the complex chemical corrosion and physical injuries, the fast depreciation of equipment occurred.3 Although the new layers made of advanced ceramic or alloy materials with wear-resistant and high hardness can effectively protect the metal substrate from injuries, the preparation of coatings with high density are difficult. The traditional petroleum-derived polymers/resins with low density such as phenolic, epoxy, and polyurethane (PU) are still the most commonly used.2,4–13 However, it is difficult for them to satisfy the multifunctional requirements of various outdoor equipment in light weight, high hardness, thermal insulation, and environmental protection. Therefore, it is urgent to develop the lightweight and multifunctional alternatives to meet the needs of industrial development.2 To combine the advantages of ceramic and polymers, the particulate-filled polymer composite film was the effective way. PU has attracted great interest in membrane industry, owing to its controllable surface properties such as hardness, adhesion, flexibility, and machinability.2,14–17 a)
Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2018.248 J. Mater. Res., 2018
However, traditional volatile solvent-based PU denoted as VOCs (volatile organic compounds) will emit various toxic chemicals which are pot
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