Developing lignin-based resin coatings and composites |
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| Authors: | Yoosup Park WOS Doherty Peter J Halley |
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| Institution: | 1. Centre for High Performance Polymers (CHPP), Division of Chemical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia;2. Sugar Research and Innovation, Queensland University of Technology, Brisbane, QLD 4001, Australia;1. Department of Biotechnology, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden;2. Division of Structural Mechanics, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden;1. Sustainable Bioproducts Department, Mississippi State University, MS, 39762, United States;2. Forestry Department, Michigan State University, 480 Wilson Road, East Lansing, MI, 48824, United States;1. School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, USA;2. Institute of Paper Science and Technology, Georgia Institute of Technology, Atlanta, GA, USA;1. Department of Chemical and Biochemical Engineering, Faculty of Engineering, Western University, London, ON N6A 5B9, Canada;2. Research and Technology, Arclin USA, Springfield, OR 97477, USA |
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| Abstract: | Phenol in phenol formaldehyde (PF) resin has been partly substituted with lignin extracted from sugarcane bagasse. In order to optimize the lignin-based resin for applications in coating and composite materials, thermal and rheological tests were performed with different wt% of lignin substitution into PF resins. Differential scanning calorimetry scans showed a small exothermic peak and a large endothermic peak, typical of resins. The Tg of the resins was seen between 125 and 150 °C and this transition was clearly evident when the lignin content was increased from 10 to 40 wt%. Increasing the lignin content in the PF resin increases the rate of cure and the heat of reaction. Water absorption tests show that the lignin-PF resin films are effective water-barrier coatings for cardboard substrates. It is speculated that the interaction between the substrate and the lignin-PF resin has resulted in a negative surface charge which would have contributed to the reduction in the contact angle. |
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