목재의 치수 안정화에 관한 연구 - Polyethylene Glycol 의 혼합액을 중심으로 -

오정수,전철 ( Joung Soo Oh,Cheol Cheon ) 한국산림과학회 1987 한국산림과학회지 Vol.76 No.2

This study was carried out to elucidate the desirable PEG molecular weight and it`s blending methods which can promote the dimensional stabilization of Corpus controversa, Quercus variabilis and Prunus sargentii. The results may be summarized as follows: 1. PEG polymer loading in woods was affected by specific gravity of wood. And the PEG polymer loading was satisfactory except in Quercus variabilis, which shows the blending method of PEG V was proper. 2. Bulking coefficiency of PEG V was high in Corpus controversa and Prunus sargentii, and it is necessary to paint or coat water-proofing wood preservative: for high bulking coefficiency of Quercus variabilis. 3. In the treatment of PEG V, the antishrink efficiency of Prunus sargentii was 82.59% and that of Quercus variabilis 62.79%. 4. Dimensional stabilization of hardwoods did not have apparant relation with PEG blending method. 5. Judging from results, PEG-400 and PEG-1000 would be enough for dimensional stabilization of hardwood having high specific gravity if other factors are considered well.

본질 건축재의 내화처리 효과에 관한 연구

오정수(Joung Soo Oh),조병묵(Byoung Muk Jo) 원광대학교 생명자원과학연구소 1981 농대논문집 Vol.4 No.-

Polyethylene Glycol 의 분자량이 목재의 (木材) 치수 안정화에 미치는 영향

전철,오정수 ( Cheol Cheon,Joung Soo Oh ) 한국산림과학회 1985 한국산림과학회지 Vol.71 No.1

This study was carried out in order to prevent the devaluation of wood itself and wood products causing by anisotropy, hygroscopicity, shrinkage and swelling - properties that wood itself only have, in order to improve utility of wood, by emphasizing the natural beautiful figures of wood, to develop the dimensional stabilization techniques of wood with PEG that it is a cheap, non-toxic and the impregnation treatment is not difficult, on the effects of PEG molecular weights (200, 400, 600, 1000, 1500, 2000, 4000, 6000) and species (Pinusdensiflora S. et Z., Larix leptolepis Gordon., Cryptomeria japonica D. Don., Cornus controversa Hemsl., Quercus variabilis Blume., Prunus sargentii Rehder.). The results were as follows; 1) PEG loading showed the maximum value (137.22%, Pinus densijlora, in PEG 400), the others showed that relatively slow decrease. The lower specific gravity, the more polymer loading. 2) Bulking coefficient didn`t particularly show the correlation with specific gravity, for the most part, indicated the maximum values in PEG 600, except that the bulking coefficient of Quercus variabilis distributed between the range of 12-18% in PEG 400-2000. In general, the bulking coefficient of hardwood was higher than that of softwood. 3) Although there was more or less an exception according to species, volumetric swelling reduction was the greatest in PEG 400. That is, its value of Cryptomeria japonica was the greatest value with 95.0%, the others indicated more than 80% except for Prunus sargentii, while volumetric swelling reduction was decreased less than 70% as the molecular weight increase more than 1000. 4) The relative effectiveness of hardwood with high specific gravity was outstandingly higher than softwood. In general, the relative effectiveness of low molecular weight PEG was superior to those of high molecular weight PEG except that Quercus variabilis showed more than 1.6 to the total molecular weight range, while it was no significant difference as the molecular weight increase more than 4000. 5) According to the analysis of the results mentioned above, the dimensional stabilization of hardwood was more effective than softwood. Although volumetric swelling reduction was the greatest at a molecular weight of 400. In the view of polymer loading, bulking coefficiency reduction of swelling and relative effectiveness, it is desirable to use the mixture of PEG of molecular weight in the range of 200-1500. To practical use, it is recommended to study about the effects on the mixed ratio on the bulking coefficient, reduction of swelling and relative effectiveness.

펄프 제지산업에서의 바이오테크놀러지 응용

김은표 ( Eun Hee Kim ),오정수 ( Joung Soo Oh ),조병묵 ( Byoung Muk Jo ) 한국목재공학회 1992 목재공학 Vol.20 No.3

杜仲나무 葉(잎)을 利用한 國産茶 開發에 關한 硏究

吳正壽,趙榮煥 동국대학교 대학원 1977 大學院硏究論集-東國大學校 大學院 Vol.7 No.-

A study on the Quality of "Doojoong" Tea to develop abeverage indigenous to Korea' leaves of Doojoong tree (Eucommia ulmoides) were investigated for their chemical composition, extraction conditions and processing methods. It was concluded that Doojoong-tea from the leaves posses acceptable qualities as a favorite beverage.

杜仲나무 葉(잎)을 利用한 國産茶 開發에 關한 硏究

吳正壽,趙榮煥 동국대학교 대학원 1977 연구논집 Vol.7 No.

木材의 熱分解 反應 및 그 分解速度에 關한 硏究(I報)

吳正壽 尙志大學校 1980 論文集 Vol.1 No.-

In order to investigate the mechanism of wood pyrolysis and develop the effective fire retardant for wood. DTA(Differential Thermal Analysis). TGA(Thermo Gravimetric Analysis) and DSC(Differential Scanning Calorimetry) on sample wood powder(60-80 mesh) of 3 species (Pinus densiflora. Quercus serrata, shorea polysperma) were Performed in air, nitrogen and vacuum and analyzed kinetically for fundamental investigation to obtain some parameters for pyrolysis of wood and fire retardant effects. The obtained results areas follows: 1.The thermal decomposition of woodshowed initial significant weight loss at 180-190℃ Most active pyrolysis occured at 290-300℃ and then ended at near 400℃. 2.The pyrolysis of wood in air was greater than in nitrogen and in vacuum, because of additional oxidation by oxygenin air. Pyrolysis in nitrogen was the slowest and the amount of carbonized residual were also larger than those of pyrolysis in air and vacuum. 3.The activation energies of wood pyrolysis could be calculated from the following equation derived from Arrhenius' equation. In(?????)Inko-????? 4.The thermal degradation of all 3 species had three stages of activation energies for pyrolysis in air and four stages in nitrogen and in vacuum. This phenomena was quite different from the results of others. 5.The effect of cellulose on thermal degradation of wood appeared sensitively. DSC curve of lignin is affected by its preparation and peaks were broadly exothermal.

針葉樹 톱밥을 利用한 노랑느타리와 버들송이의 人工栽培에 關한 硏究

吳正壽,金思翼,高敏圭,金成柱 동국대학교 농과대학 1992 演習林硏究報告 Vol.- No.2

버섯의 人工栽培는 주로 참나무類를 利用하고 있지만 점차적인 枯渴狀態로 代替樹種의 開發이 必要하다. 그러므로 本 硏究는 노랑느티나무와 버들송이의 소나무, 리기다소나무, 잣나무, 낙엽송, 미송, 참나무의 톱밥에 대한 栽培 可能性 與否와 適正樹種 選拔을 主目的으로 하고 있으며 그 結果는 다음과 같다. 1. 노랑느타리의 버들송이의 菌絲蔓廷은 낙엽송이 가장 빠르게 각각 25日과 30日이었다. 2. 버섯發生量은 2菌 모두 낙엽송에서 가장 많고 그 다음은 리기다소나무로 노랑느타리는 175g과 165g이고 버들송이는 168g과 121g이었다. 3. 本 實驗의 結果에 의하면, 낙엽송과 리기다소나무는 노랑느타리와 버들송이의 人工栽培에 適合하다. This study was carried to test for the sawdust medium cultivation of red pine, pitch pine, Korean pine, larch hemlock, oak tree, and to select proper tree species for mushroom production of Pleurotus cornucopiae and Agrocybe cylindracea. The results were fellows. 1. Hyphae spread of two fungi was best past in Larch by 25 and 30 days. 2. Quantitles of mushrooms were 175g and 169g of P. cornucopine and 168g and 121g of A. cylindracea at larch and Pitch pine. 3. It concluded from this study that larch and pine were good for the artificial cultivation of P. cornucopiae and A. cylindraceae.

木材의 熱分解에 미치는 難燃劑의 效果에 關한 硏究

吳正壽,全哲 圓光大學校 1985 論文集 Vol.19 No.2

木材의 熱分解에 미치는 難燃劑의 效果를 檢討하여 다음과 같은 結果를 얻었다. 1) 木材를 難燃處理하면 減量開始가 일어나는 初期가階에서는 熱分解가 빠르며 主熱分解市에는 熱分解를 抑制하여 높은 殘存重量을 얻게 됨이 밝혀졌다. 2) 難燃劑의 吸着量이 많을수록 減量開時溫度와 最大減量을 나타내는 溫度는 低下하고, 最大減量遠度는 減少하여 殘存重量은 增加한다. 3) 零圍氣에 依한 差異는 試料의 熱分解로 생긴 分解生成物이 氣相으로 移行하는 경우의 差異에 기인하는 것으로 판명된다. 4) 難燃劑處理木粉에서의 木粉과 難燃劑의 相互作用은 모든 供試 難燃劑處理木粉에서 다 인정되었다. 卽, 難燃劑處理木粉의 b에서의 相互作用은 Nitrogen 中의 Ammonium bromide處理木粉이 分解抑制作用을 나타낼 뿐 其他 難燃劑에 依해서는 分解促進作用이 인정되었다. Upon examination of the flame retarder which has an effect on pyrolysis of wood, the result indicated below has been obtained finally. 1) When a wood is processed by resistance to flame, its pyrolysis, at the beginning step having reduction, is pretty fast and, at the time of pyrolyzing of its main heat, it represses pyrolysis and disclosed that it can be obtained a high surviving weight. 2) The more quantity of absorption of flame retarder, the temperature showing the beginning temperature of reduction and the largest reduction are decreased, and the speed of the largest reduction is decreased, and then irs surviving wight is, however, increased. 3) The difference by atmosphere is known that it is caused by the difference in the event that a product by dissolution, which is occurred by pyrolysis, moves to the gaseous form. 4) The mutual operation of the wood powder from its being processed wood powder of the flame retarder and the flame retarder were confirmed from all the given tests of the processed wood powder of the flame retarder, that is to say, the mutual operation from "b" of the processed powder of Ammonium bromide out of Nitrogen only disclosed an operation of repression of dissolution and accelerating operation of dissoulution in accordance with other flame retarders have recognized.

크라프트 리그닌의 利用에 關한 硏究 : 第1報 合板製造用 接着劑로서의 利用 part 1. Utilization of Kraft lignin as adhesives for plywood manufacture

吳正壽,裵映壽,元鐘鳴 圓光大學校 基礎自然科學硏究所 1984 基礎科學硏究誌 Vol.3 No.1

A waterproof adhesive based on Kraft Lignin and PF resin was prepared and some of its properties evaluated in order to develop the technology for utilization of Kraft Lignin as plywood adhesive. In combination of MKL(Methylolated Kraft Lignin), dry shear strength of plywood with 15% combination of MKL was superior to that of 100% PF resin used and indicated that up to 45% of PF resin can be replaced by Kraft lignin. Wet shear strength of plywood was passed standard level of 10㎏/㎝^2 in 15∼45% combination. However, its combination cause the difficulty of glue spreading and insufficient cross-linking. Therefore, it is recommended to make copolymer of MKL and PF.