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Paper Information

Journal:   IRANIAN JOURNAL OF WOOD AND PAPER SCIENCE RESEARCH   summer 2016 , Volume 31 , Number 2 (55) #f00641; Page(s) 211 To 223.

Determinating the optimom conditions of poplar wood chemical modification using Glutaraldehyde and physical properties of the product

* Department of Wood and Paper Sciences and Technology, Sari University of Agricultural Sciences and Natural Resources, Sari, Iran
This research was conducted to determine the optimom conditions for chemical modification of poplar wood using glutaraldehyde and its effect on the physical properties of product. Test samples were prepared according to the ASTM-B4446-05 method and then impregnated in the laboratory cylinders with Glutaraldehyde at a concentration of 10% using vacuum-pressure method. Modification reaction was carried out using two different procedures. First heating in the laboratory cylinder (Hydrothermal) for 4 hour and then in oven 4, 12, 24 and 48 hours. Weight percent gain of sample modified by hydrothermal and oven method was measured as 2. 10, 9. 26, 10. 02, 11. 40 and 14. 15% respectively. Chemical modification of wood with glutaraldehyde intiates hydroxyl group substitution, and reduces the uptake of water and swelling of poplar wood. Upon-soaking the sample in hot water for 48 hours showed minimum water absorption and dimensional changes as 57. 32 and 12. 08 respectively, and highest bulking, ASE and ASE′ in 8. 31, 67 and 35. 51% respectively was selected as the optimom level. This improvement as compared to other modification levels demonstrates forming of permanent Cross-linking of acetal that increased by prolonge heating time.
Keyword(s): Chemical modification,poplar wood,glutaraldehyde,physical properties,bulking
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