Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 27, Issue 2, Pages 163-167Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.indcrop.2007.07.021
Keywords
coatings; composites; lignin; resins; sugarcane
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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 T. of the resins was seen between 125 and 150 degrees 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. (c) 2007 Elsevier B.V. All rights reserved.
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