| Project/Area Number |
60470138
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
林産学
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
SAKATA Isao Kyushu University, Faculty of Agriculture., 農学部, 教授 (10038169)
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| Co-Investigator(Kenkyū-buntansha) |
UEHARA Toru Shimane University, Faculty of Agriculture., 農学部, 助手 (90093640)
MORITA Mitsuhiro Kyushu University, Faculty of Agriculture., 農学部, 助手 (30038301)
HIGUCHI Mitsuo Kyushu University, Faculty of Agriculture., 農学部, 助教授 (80038257)
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| Project Period (FY) |
1985 – 1987
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| Project Status |
Completed (Fiscal Year 1987)
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| Budget Amount *help |
¥4,200,000 (Direct Cost: ¥4,200,000)
Fiscal Year 1987: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1986: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1985: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | Corona discharge / Corona treatment / Surface treatment / Wood adhesion / Schiff's dyeing / Bonding strength / Wettability / シッフ染色 / 放電プラズマ |
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| Research Abstract |
The treatment of the surfaces of wood in a corona discharge improved greatly the wettability and bonding properties of wood.
Some experiments regarding the chemical effects of the corona treatment on the surface activation of wood were made with the aid of dye adsorption methods. Both untreated and corona-treated woods adsorbed basic dye, methylene blue, in the same extent of dyeing. This indicates that no measurable acidic sites (carboxyl groups) increased on the the surfaces of the wood by the corona treatment. To detect aldehyde groups, the dyeing examination of wood surfaces with Schiff's reagent was made, and the results showed a higher dyeing ability for the corona-treated woods compared to the untreated, indicating that aldehyde groups on the wood surfaces increased with an increase in the degree of corona treatment. The corona treatment seems to produce on the wood surfaces aldehyde groups and peroxide groups, which will tend to react with added lignin or tannin substance as gap filling agents and thus bring about the strong bonding strength between woods.
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