Preparation and Characterization of Optically Active Polyurethane from Rotatory Binaphthol Monomer and Polyurethane Prepolymer |
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| Authors: | Ling Lin Haiyan Mao Ziyin Li Wenyao Li Chaoxia Wang |
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| Institution: | 1.Key Laboratory of Eco-Textile, School of Textiles and Clothing, Jiangnan University, Ministry of Education, 1800 Lihu Road, Wuxi 214122, China;2.Yancheng Institute of Technology, College of Textiles and Clothing, Yancheng 224051, China; (H.M.); (Z.L.);3.School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China; |
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| Abstract: | Optically active polymers are promising multifunctional materials with great application potentials. Herein, environmentally friendly optically active polyurethanes (OPUs) were obtained by introducing rotatory binaphthol monomer to polyurethane. The influence of binaphthol monomer content on the structure, mechanical properties, infrared emissivity, and thermal insulation of OPUs was studied intensively. Structure characterization indicated that the optically active polyurethanes have been successfully synthesized. The OPU synthesized with BIMOL and BDO at the mole ratio of 1:1 presented better thermal resistance. In addition, OPUs showed enhanced tensile strength and stretchability with the increase of BINOL content to a certain extent due to its rigid structural features and high molecular weight. The optically active polyurethanes showed lower infrared emissivity values (8–14 μm) than waterborne polyurethane (WPU), and the infrared emissivity decreased from 0.850 to 0.572 as the content of the BINOL monomer increased. Moreover, OPU4 exhibited the best heat insulation and cooling ability with about a 7 °C temperature difference. The thus-synthesized optically active polyurethanes provide an effective solution for developing highly effective thermal insulation materials. |
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| Keywords: | optically active polyurethane structure thermal insulation infrared emissivity |
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