Effects of preparation conditions on properties of rigid polyurethane foam composites based on liquefied bagasse and jute fibre |
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| Institution: | 1. Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology, Wuhan, 430068, China;2. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510641, China;1. Universidade Estadual Paulista (UNESP), Faculdade de Engenharia, Câmpus de Ilha Solteira, Avenida Brasil, 56, Centro, 15385-000 Ilha Solteira, SP, Brazil;2. Universidade Estadual Paulista (UNESP), Câmpus Experimental de Rosana, Avenida dos Barrageiros, 1.881, Centro, 19.274-000 Rosana, SP, Brazil;1. Institute of Wood Science and Technology, and Sustainable Development, Celovška cesta 268, 1000 Ljubljana, Slovenia;2. University of Ljubljana, Biotechnical Faculty, Department of Wood Science and Technology, Jamnikarjeva 101, 1000 Ljubljana, Slovenia;3. University of Primorska, Andrej Marušič Institute, Muzejski trg 2, 6000 Koper, Slovenia;4. Chemcolor Sevnica d.o.o., Dolnje Brezovo 35, 8290 Sevnica, Slovenia;1. Department of Polymer Technology, Chemical Faculty, G. Narutowicza Str. 11/12, Gdańsk University of Technology, 80-233 Gdańsk, Poland;2. Institute of Fluid Flow Machinery, Fiszera Str. 14, 80-231 Gdansk, Poland;3. Faculty of Mechanical Engineering, Siedlicka Str. 4, Gdansk University of Technology, 80-233 Gdansk, Poland;1. Department of Applied Chemistry and Polymer Technology, Delhi Technological University, Delhi 110042, India;2. Department of Mechanical Engineering, Delhi Technological University, Delhi 110042, India;1. Division of Materials Science, Composite Centre Sweden, Luleå University of Technology, 971 87 Luleå, Sweden;2. Centre for Biocomposite and Biomaterials Processing, Faculty of Forestry, University of Toronto, 33 Willcocks Street, Toronto M5S 3B3, Canada |
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| Abstract: | Rigid polyurethane foams based on liquefied bagasse and reinforced with jute fibre were prepared. The effects of preparation conditions were investigated using a paper cup with a small horizontal section area as a mould. They were reflected in the foam height, which acted as a sensitive indicator. Density gradient existed in the foam rise direction and decreased from the bottom to top. Although the amount of blowing agent water was fixed, the foam height increased with stirring time after the addition of diphenyl methane diisocyanate, the isocyanate index and the catalyst content. This was partly due to the released heat that also contributed to the foam expansion. The relative intensity of the C─N stretching band at 1510 cm−1 and the N─H out-of-plane bending band at 1527 cm−1 in the FTIR spectrum reflected isocyanate reactions, which had a close relationship with the crosslink density. The normalized compressive strength was essentially attributed to the combined effects of the crosslink density and the thickness of cell walls and struts. Jute fibre enhanced the compressive strength only slightly due to poor interfacial adhesion between some fibres and the matrix. |
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| Keywords: | Rigid polyurethane foam Liquefied bagasse Normalized compressive strength Thickness of cell walls and struts FTIR spectrum |
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