Abstract
The modified acrylonitrile-styrene-acrylate terpolymer (ASA) serving as thermal insulation material has been investigated, accompanied by the Y3Al5-xFexO12 (x = 0.5, 1.0, 1.5, 2.0, 3.0) inorganic powders as the functional modifiers. The formation of Fe-doped Y3Al5O12 has been ensured by analyzing XRD patterns and noticing the strong bands of M − O (M = Y, Al and Fe) vibrations in FTIR spectra. FE-SEM images revealed that the granular size of Fe-doped Y3Al5O12 powders is about 100–300 nm. The Fe-doped Y3Al5O12 assume dark yellow-brown color, stemming from the d-d electronic transition of Fe3+. Their NIR solar reflectance (86.47%–68.08%) presents a decreasing trend with the increasing Fe3+ doping concentration, which could be interpreted from the perspective of free carriers. The modified ASA with the Fe-doped Y3Al5O12 addition also has excellent NIR solar reflection performance. In addition, it is beneficial to increase the content of the as-synthesized pigments in ASA for NIR solar reflectivity. In simulated research, modified ASA is estimated to reduce the heat flux by up to 33.5% compared with unadded ASA. The high NIR solar reflection of the pigments and the inherent weather-fastness of ASA enabled the modified ASA to qualify for heat-insulation and energy-saving applications.
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