Abstract
Photochromic wood was fabricated by coating microencapsulated photochromic material (MP)/polydimethylsiloxane composites onto wood using a simple drop-coating method. Urea-melamine–formaldehyde resin was used to microencapsulate the photochromic material (PM) via in situ polymerization. The concentration of the MP affected the photochromic property of the wood surface. The total color change (ΔE*) reached 82.2 when the concentration of the composite coating is 8%. Adhesion tests confirmed that the composite coating adhered firmly to the wood. This method is potentially useful for the production of functional wooden products, such as anti-counterfeiting materials and aesthetic wood.
Highlights
Microencapsulation is used to enclose solid and liquid microparticles and gasses in inert shells, which can be used for the sustained release of the materials within the core (Azagheswari et al 2015)
We demonstrated the large-scale production of photochromic wood, which was subsequently used as a photo-switchable and colorful smart wood surface
The surface elemental compositions of carbon, oxygen, and nitrogen in the photochromic material (PM) and MP were determined by X-ray photoelectron spectroscopy (XPS) (Fig. 3f)
Summary
Microencapsulation is used to enclose solid and liquid microparticles and gasses in inert shells, which can be used for the sustained release of the materials within the core (Azagheswari et al 2015). Microcapsules are classified based on their functions (Lee et al 2016), including fire resistance (Ma et al 2013), thermochromism (Ma and Zhu 2009), photoresponsivity (Hu et al 2016), and energy storage (Chen et al 2015) (Fig. 1). Microencapsulation has been used in the manufacture of several products including adhesives, agrochemicals, pharmaceuticals, and other advanced functional materials (Hu et al 2014; Xu et al 2016). Many modification methods have been developed to improve the functions or applications of wood products (Lang et al 2018). The number of wood modification methods has greatly expanded recently, wood functionalization is still a focus of both industry and academia (Perez et al 2018)
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