Nima Seyedmohammadi ¹, Mohammad Nemati ¹, Ahmad Samariha ¹, Asghar Tabei ², Foad Ravanbakhsh ¹, Majid Kiaei ³

Affiliations
1 Department of Wood and Paper, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 Department of Wood and Paper, Astara Branch, Islamic Azad University, Astara, Iran
3 Department of Wood and Paper Science and Technology, Chalous Branch, Islamic Azad University, Mazandaran, Iran

Abstract

In this study, the effect of the age (6, 8 and 10 years) of Eucalyptus camledulnnesis on chemical composition, gravity and degree of polymerization of cellulose, was determined. Wooden samples were provided from plantation forests. In chemical analysis for each age, the percent of cellulose, hemicelluloses, lignin, extractive, and ash were determined. Results show that by increasing of the age of tree, the amount of cellulose, extractives and lignin increased, but the amount of hemicellulose and ash decreased. Gravity of cellulose liquid also determined and then degree of polymerization (DP) was calculated. The obtained gravity for ages of 6, 8 and 10 relatively are 360, 570, and 620 ml g^-1 and DP was relatively 320, 540 and 666 units. At the end, by studying the obtained results in every step, the differences among each three ages were significant, but the difference between the age 6 with other two ages was more. The tree with 10 years older had the highest degree of polymerization but with consideration of the age factor, because of reduction in Forestry cost, the age 8 is suggested for productivity.

Keywords

Cellulose, Eucalyptus camledulnnesis, Lignin, Tree Age

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