Temperature Effect on Polyethylene glycol Treatment of Wood
Project/Area Number |
11660168
|
Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
林産学
|
Research Institution | Kyoto Prefectural University |
Principal Investigator |
ISHIMARU Yutaka Kyoto Prefectural University, Department of Agriculture, Associate Professor, 農学部, 助教授 (20026496)
|
Project Period (FY) |
1999 – 2000
|
Project Status |
Completed (Fiscal Year 2000)
|
Budget Amount *help |
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2000: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1999: ¥2,000,000 (Direct Cost: ¥2,000,000)
|
Keywords | wood / cell wall / polyethylene glycol / molecular weight / dimensional stability / bulking effect / mechanical properties / adsorptivity |
Research Abstract |
Degrees of molecular weight of polyethylene glycol (PEG) being be able to penetrate into cell wall of wood is important in dimensional stabilization of wood treated with PEG.It have been generally recognized that although PEG having a lager molecular weight than 3000 could not penetrate into cell wall, appreciable dimensional stabilities had been obtained by treating with PEGs having lager molecular weights in practice. These inconsistent results are probably stemmed from an effect of temperature. Thus, temperature effect on the dimensional stability of wood treated with PEGs, temperature dependence of the adsorption of PEG onto wood and the amount of preferentially sorbed water were investigated. Some mechanical properties of wood treated with PEGs were also studied for certifying penetration of PEGs into cell walls. Bulking effect of treated wood increased with increasing temperature of treatment and drying, especially in the case of treatment with PEGs having higher molecular weights. Considerable bulking effect obtained for the wood treated at a low temperature (20℃) with PEGs having relatively high molecular weight was probably caused by coating of PEG solidified during drying process. Amount of adsorbed PEGs increases with clevating temperature, and this tendency was more extensive for PEG of higher molecular weight. The amount of preferentially sorbed water decreases remarkably with elevating temperature in the case of the adsorption of PEG having higher molecular weight. The mechanical properties of the treated wood showed that larger amount of PEGs having relatively high molecular weight could penetrate into cell walls of wood at higher temperature. From these results, it can be interpreted that molecules of PEG having relatively high molecular weight can penetrate more easily into cell Walls of wood at higher temperature, resulted from relaxation of cohesive structure of water in the cell wall at higher temperature.
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Report
(3 results)
Research Products
(8 results)