Incorporation of photochromic sodalite into balsa to create photochromic transparent wood
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Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty.
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Photochromic transparent wood (PTW) has gained significant attention as an energy-saving building material. As we live in an era of high energy consumption, rising environmental pollution, and high carbon emissions, it is important to move towards green, sustainable materials. Poorly performing windows account for a major part of energy consumption in the building sector. In this perspective, wood is a promising alternative base material for light-transmitting windows due to its high abundance, porous structure, low thermal conductivity, and ability to incorporate functional properties.
Transparent wood (TW) can be fabricated by removing the light-absorbing lignin from natural wood and infiltrating its porous structure with a refractive index-matching polymer, which improves optical transparency. By incorporating photochromic materials such as hackmanite, TW can be further developed into PTW. Hackmanite is a sodalite mineral that shows reversible photochromism. When hackmanite is exposed to excessive UV radiation, it develops color due to the formation of color centers, which reduces excessive light and heat entering the indoor environment. At the same time, in low-light conditions, it allows more light to enter the indoor environment.
The aim of this study was to evaluate the possibility of incorporating hackmanite into balsa wood to create PTW. During this work, balsa wood was delignified to remove lignin. Hackmanite samples were prepared by solid-state synthesis. PTW were prepared by vacuum infiltration of delignified wood with pre-polymerized methyl methacrylate (MMA) containing different weight percentages (m-%) of hackmanite, followed by further polymerization. Wood grain orientation, wood thickness, pre- polymerization time, vacuum infiltration time, and hackmanite content were the main controlled parameters during the experimental section.