Color and Gloss Changes of a Lignin-Based Polyurethane Coating under Accelerated Weathering
作者机构：Department of Wood Science and TechnologyFaculty of Natural ResourcesTarbiat Modares UniversityTehranIran Department of Resin and AdditivesInstitute for Color Science and TechnologyP.O.Box 16765-654TehranIran LERMABUniversity of LorraineBlvd des AiguillettesNancy54000France Wood Science and EngineeringLuleåUniversity of TechnologySkellefteåSweden
出 版 物：《Journal of Renewable Materials》 (可再生材料杂志（英文）)
年 卷 期：2024年第12卷第2期
页 面：305-323页
核心收录：
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：Tarbiat Moallem University TMU
主 题：Amination propylene carbonate lignin biopolymer polyurethane coating polyol UN SDG 13
摘 要：The purpose of this research study was to investigate the properties of polyurethane coatings based on lignin *** this purpose,the prepared coatings were applied to pine wood surfaces and weathered ***,color and gloss of the coatings were measured before and after the weathering *** emission scanning electron microscopy(FE-SEM)micrographs prepared from the coatings showed that the average size of nano-particles in the polyurethane substrate was approximately 500 *** magnetic resonance(13C-NMR)spectroscopy showed that strong urethane bonds were formed in the nano-lignin-based *** calorimetric analysis(DSC)test revealed that the glass-transition temperature(Tg)of lignin nanoparticles modified with diethylenetriamine(DETA)was 112.8℃ and Tg of lignin nano-particles modified with ethylenediamine(EDA)was 102.5℃,which is lower than the Tg of un-modified lignin(114.6℃)and lignin modified with DETA(126.8℃)and lignin modified with EDA(131.3℃).The coatings modified with lignin nano-particles had a greater change in *** lignin nano-particles in the modified coating are trapping hydroxyl radicals which reduces photoactivity and yellowing of the polyurethane by about 3 times compared to unmodified polyurethane *** weathering test,the nano-lignin-based coating had a rougher surface with a lower contact angle(0.78°)compared to the unmodified polyurethane coating(0.85°).
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