Hydrolyzed chitosan and its application along with tannin as a wood preservative

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Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
Chitosan with high molecular weight does not have the ability to penetrate the wood cell walls ‎and has little protective effects to increase the durability of wood. On the other hand, tannin can ‎easily be leached from impregnated woods and has a high leaching rate. The aim of this ‎research is to produce tannin-chitosan polymer and investigate the resistance to decay of ‎impregnated samples with it. Beech wood was used in this study. Initially, acid hydrolysis ‎method was used to reduce the molecular weight of chitosan. Then different ratios of ‎hydrolyzed chitosan and tannin were combined to find the best formulation. Vacuum-pressure ‎impregnation method was used. After impregnation and polymerization of tannin/chitosan, ‎water leaching test and resistance to decay against white and brown rot fungi were performed. ‎The results showed that adding hexamine to tannin-chitosan polymer leads to a reduction in the ‎percentage of water leaching of the protective material from wood and improves the fixation ‎and durability of the materials. Also, the resistance of wooden samples against brown and white ‎rot fungi has increased. The chitosan ratio increasing in the tannin/chitosan mixture led to an ‎increase in the leaching of substances and a decrease in the resistance to decay of impregnated ‎woods.‎
Language:
Persian
Published:
Iranian Journal of Wood and Paper Industries, Volume:15 Issue: 2, 2024
Pages:
123 to 136
https://magiran.com/p2766655  
سامانه نویسندگان
  • Efhamisisi، Davood
    Corresponding Author (3)
    Efhamisisi, Davood
    Assistant Professor Faculty of Natural resources, University of Tehran, University of Tehran, تهران, Iran
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