Effects of polysaccharides on the properties of Chinese lacquer sap |
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| Affiliation: | 1. Department of Environmental Engineering, School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China;2. Department of Environmental Science, College of Resource and Environmental Science, Wuhan University, Wuhan 430079, China;1. School of Chemistry, University of Leeds, LS2 9JT Leeds, UK;2. The Valspar Corporation, Witney, Oxon OX8 6XR, UK;3. The Food and Environment Research Agency, Sand Hutton, York YO41 1LZ, UK;1. Organic Polymer Chemistry Research Laboratory, Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran;2. Nanotechnology and Advanced Materials Institute, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran;3. Center of Excellence in Sensors and Green Chemistry, Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran;1. Programa de Pós-Graduação em Engenharia de Minas, Metalúrgica e Materiais (PPGE3M), Escola de Engenharia (EE), Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves, 9500 Bairro Agronomia, Porto Alegre, RS, Brazil;2. Departament d’Enginyeria Química, E. T. S. d’Enginyeria Industrial de Barcelona, Universitat Politèecnica de Catalunya, Diagonal 647, Barcelona E-08028, Spain;3. Center for Research in Nano-Engineering, Universitat Politèecnica de Catalunya, Campus Sud, Edifici C’, C/Pasqual i Vila s/n, Barcelona E-08028, Spain;1. U.R. Electrochimie et Environnement, E.N.I.S – BPW, Université de Sfax, 3038 Sfax, Tunisia;2. Laboratoire des Sciences des Matériaux et d’Environnement, F.S.S, Université de Sfax, 3018 Sfax, Tunisia |
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| Abstract: | Raw lacquer sap was modified by the addition of small amounts of 2 wt% polysaccharide (lacquer polysaccharide, chitosan, carboxymethyl cellulose and sodium alginate) aqueous solution. The polysaccharide-modified lacquer saps dried faster than raw lacquer sap at a high relative humidity of 80%. The drying property strongly depended on the structure of polysaccharides and the drying time was in the order of chitosan < carboxymethyl cellulose < sodium alginate < lacquer polysaccharide. All lacquer saps did not dry at a very low relative humidity of 16%. However, when the relative humidity was adjusted to 70%, the polysaccharide-modified lacquer saps dried, while the raw lacquer sap did not. This difference was probably due to stronger hydrophilicity of polysaccharide-modified lacquer films’ surfaces. In addition, the addition of polysaccharides greatly improved the gloss of lacquer films, but had little effects on the thermal, mechanical and chemical resistance properties of lacquer films. |
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| Keywords: | Lacquer Polysaccharide Drying Film property |
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