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A platform for research: civil engineering, architecture and urbanism
Facile Fabrication of Waterproof and Flame-Retardant Microfibrillated Cellulose Aerogels from Pineapple Leaves for Acoustic Insulation
Cellulose aerogels have been utilized for acoustic insulation due to their excellent sound absorption. However, one of their drawbacks is hydrophilicity and flammability hindering their long-term storage and applicability. This work develops water-resistant, flame-retardant, and sound-absorbing aerogels from pineapple leaves via a facile and eco-friendly route. The leaves are pretreated by two-step consecutive pre-treatment with 3% NaOH and 1% NaOH/10% H2O2 solutions to remove undesirable impurities and enhance cellulose content. Consequently, the obtained cellulose-rich pulp is consumed to produce cellulose sub-microparticles (SMCs) via a mild acid hydrolysis using 40% H2SO4 solution and high-speed homogenization. The particles and the pretreated cellulose fibers are then mixed with polyamide amine-epichlorohydrin as a cross-linker and ammonium polyphosphate (APP), followed by freeze-drying, annealing, and methyltrimethoxysilane (MTMS) coating to produce functional aerogels. Effects of fiber composition, cellulose content, APP content, and coating condition on structure, flame retardancy, hydrophobicity, and sound absorption of the aerogels are investigated. The aerogels are light-weight (30–40 mg/cm3), highly porous, hydrophobic, and flame-retardant. The as-fabricated aerogels with a thickness of 20 mm exhibit higher noise reduction coefficiency (NRC) of 0.36 and average sound absorption coefficient (α) of 0.73 in the frequency range of 1250–2500 Hz than the pineapple leaf-based aerogels crosslinked by polyvinyl alcohol (NRC of 0.32 and α of 0.70, same thickness). The utilization of pineapple leaves and a sustainable approach have created green, biodegradable and building-graded aerogels derived from biomass for acoustic insulation.
Facile Fabrication of Waterproof and Flame-Retardant Microfibrillated Cellulose Aerogels from Pineapple Leaves for Acoustic Insulation
Cellulose aerogels have been utilized for acoustic insulation due to their excellent sound absorption. However, one of their drawbacks is hydrophilicity and flammability hindering their long-term storage and applicability. This work develops water-resistant, flame-retardant, and sound-absorbing aerogels from pineapple leaves via a facile and eco-friendly route. The leaves are pretreated by two-step consecutive pre-treatment with 3% NaOH and 1% NaOH/10% H2O2 solutions to remove undesirable impurities and enhance cellulose content. Consequently, the obtained cellulose-rich pulp is consumed to produce cellulose sub-microparticles (SMCs) via a mild acid hydrolysis using 40% H2SO4 solution and high-speed homogenization. The particles and the pretreated cellulose fibers are then mixed with polyamide amine-epichlorohydrin as a cross-linker and ammonium polyphosphate (APP), followed by freeze-drying, annealing, and methyltrimethoxysilane (MTMS) coating to produce functional aerogels. Effects of fiber composition, cellulose content, APP content, and coating condition on structure, flame retardancy, hydrophobicity, and sound absorption of the aerogels are investigated. The aerogels are light-weight (30–40 mg/cm3), highly porous, hydrophobic, and flame-retardant. The as-fabricated aerogels with a thickness of 20 mm exhibit higher noise reduction coefficiency (NRC) of 0.36 and average sound absorption coefficient (α) of 0.73 in the frequency range of 1250–2500 Hz than the pineapple leaf-based aerogels crosslinked by polyvinyl alcohol (NRC of 0.32 and α of 0.70, same thickness). The utilization of pineapple leaves and a sustainable approach have created green, biodegradable and building-graded aerogels derived from biomass for acoustic insulation.
Facile Fabrication of Waterproof and Flame-Retardant Microfibrillated Cellulose Aerogels from Pineapple Leaves for Acoustic Insulation
Lecture Notes in Civil Engineering
Reddy, J. N. (editor) / Wang, Chien Ming (editor) / Luong, Van Hai (editor) / Le, Anh Tuan (editor) / Do, Nga H. N. (author) / Phan, Bao L. (author) / Nguyen, Luon Tan (author) / Goh, Xue Yang (author) / Duong, Hai M. (author) / Le, Kien A. (author)
The International Conference on Sustainable Civil Engineering and Architecture ; 2023 ; Da Nang City, Vietnam
2023-12-12
9 pages
Article/Chapter (Book)
Electronic Resource
English
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