Research Article | Published: 01 June 2003

Studies on chemical modification of some hardwoods

Manoranjan  Mohanty and Ashwini K. Sharma

Indian Journal of Forestry | Volume: 26 | Issue: 2 | Page No. 107-115 | 2003
DOI: https://doi.org/10.54207/bsmps1000-2003-5583P3 | Cite this article

Abstract

Mainly two chemicals, viz., sodium periodate and chromium (VI) trioxide have been used for chemical modification of hardwoods. Aqueous solution of NalO4 at lower concentrations decreased the dimensional stability (6.97%, 8.37% and 8.93% change in tangential direction for 0.1% concentration and 136 hours water soaking in Bombax ceiba/Red silk cotton tree, Celtis australis/Nettle-tree and Populus deltoides/Eastern poplar, respectively).  Aqueous solution of Cr+6O3 (Chromic acid, 5% for 5 minutes) gave maximum dimensional stability (2.78%, 3.56% and 5.46% change in tangential direction after 136 hours water soaking in Bombax ceiba, Celtis australis and Populus deltoides respectively) followed by combined treatment (1.0% NalO4 for 20 hours followed by 5.0% chromic acid for 5 minutes). Extractive leaching was reduced with the three treatments and was observed minimum in the combined treatment (0.45%, 0.24% and 0.18% after 136 hours water soaking for Bombax ceiba, Celtis australis and Populus deltoides, respectively). Water absorptivity decreased with chromic acid application and was observed minimum in the combined treatment (86.49%, 82.24% and 99.80% after 136 hours water soaking for Bombax ceiba, Celtis australis and Populus deltoides, respectively).

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How to cite

Mohanty, M. and Sharma, A.K., 2003. Studies on chemical modification of some hardwoods. Indian Journal of Forestry, 26(2), pp.107-115. https://doi.org/10.54207/bsmps1000-2003-5583P3

Publication History

Manuscript Published on 01 June 2003

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