Puji Rahmawati Nurcahyani, Widya Fatriasari, Zaimatul Aqmar Abdullah, Nurul Husna Mohd Hassan, Seng Hua Lee
Rice straw lignin (LRS) tends to be dark in color, which makes it less appealing for material applications. Therefore, a bleaching process involving lignin oxidation is of interest. This study aimed to investigate the mechanical and chemical properties of bleached LRS and explore its potential application in PU-based paper coatings. LRS and commercial lignin (LC) were subjected to bleaching using 29% H2O2 through oxidation treatment. The bleached lignin was then used to prepare PU-based paper coatings. The effects of bleaching treatment on the functional groups, structural, and thermal properties of lignin, as well as the water resistance of the PU composites were assessed. The oxidation treatment resulted in a reduction in the phenolic hydroxyl content, methoxy content, antioxidant activity, and equivalent weight of lignin. However, LRS exhibited greater thermal resistance than did LC. The bleached LRS was successfully integrated with toluene di-isocyanate (TDI) to produce transparent polyurethane. This polyurethane was then applied as a coating for paper containers, which successfully held cold water for over 4 h without leaking, indicating its outstanding water repellency. © 2025, North Carolina State University. All rights reserved.
Research Center for Biomass and Bioproduct National Research and Innovation Agency (BRIN), Kawasan KST Soekarno, Jl Raya Bogor KM 46, Cibinong, 16911, Indonesia; Food Technology Study Program, Faculty of Engineering and Industrial Education, Universitas Pendidikan Indonesia, Bandung, Indonesia; Department of Wood Industry, Faculty of Applied Sciences, Universiti Teknologi MARA Pahang Branch Jengka Campus, Pahang, Bandar Tun Razak, 26400, Malaysia
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