목분-폴리프로필렌 복합재의 기계적 특성: 목재수종, 충진제, 입자크기, 및 상용화제의 영향

강인애 ( In Aeh Kang ),이선영 ( Sun Young Lee ),도금현 ( Geum Hyun Doh ),전상신 ( Sang Jin Chun ),윤승락 ( Seung Lak Yoon ) 韓國木材工學會 2009 목재공학 Vol.37 No.6

목분-폴리프로필렌 복합재의 수분흡수율: 목재수종, 충진제 입자크기 및 상용화제의 영향

강인애 ( In Aeh Kang ),이선영 ( Sun Young Lee ),도금현 ( Geum Hyun Doh ),전상진 ( Sang Jin Chun ),윤승락 ( Seung Lak Yoon ) 한국목재공학회 2010 목재공학 Vol.38 No.4

본 연구에서는 목분 첨가된 폴리프로필렌 복합재의 수분흡수 특성에 목재수종, 화학조성분, 충진제 함량, 입자크기 및 상용화제의 첨가가 미치는 영향에 관해서 알아보았다. 500, 1,000, 1,500, 2,000, 2,500 및 3,000 시간동안 물에 침지시킨 후, 상수리나무(Quercus accutisima Carr.)와 다릅나무(Maackia amuresis Rupr. et Maxim)는 낙엽송(Larix kaempferi Lamb.)에 비하여 훨씬 낮은 물흡수도를 보였다. 모든 수종에서 목분의 함량이 10wt%로부터 50wt%까지 증가할수록, 주어진 시간동안 물에 침지시켰을 때 복합재의 수분흡수율이 증가하였다. 목분의 입자크기는 복합재의 수분흡수율에 큰 영향을 주는 것으로 나타났다. 상용화제의 첨가는 복합재의 수분흡수율을 낮추는데 아주 효과적이다. 가장 낮은 수분흡수율은 다릅나무 목분을 이용하고, 목분의 함량이 낮을수록, 목분의 입자크기가 작을수록, 그리고 상용화제를 첨가했을 때 얻을 수 있다. 복합재의 두께팽창은 수분흡수율과 아주 높은 상관관계를 가지고 있다. The effects of wood species, chemical components, filler loading level, filler particle size, and coupling agent on the water absorption property of the wood flour filled polypropylene (PP) composites were investigated in this study. After 500, 1,000, 1,500, 2,000, 2,500 and 3,000 hr water immersion, Quercus (Quercus accutisima Carr.) and Maackia (Maackia amuresis Rupr. et Maxim) showed significantly lower water absorption properties compared to Larix (Larix kaempferi Lamb.). As wood flour loading increases from 10 to 50 wt%, most wood species showed increased water absorption after a given immersion period. Particle size of wood flour proved to have very significant effects on water absorption of the composites. The effect of coupling agent was positive in terms of lowering water absorption of the composites. As the treatment level of coupling agent increases, the water absorption of the composites decreases. The lowest water absorption was obtained at the lower wood flour loading (Maackia), smaller particle size and by the addition of coupling agent. Thickness swelling of the composites shows close dependency on water absorption.

셀룰로오스 나노섬유의 제조 및 응용: 고강도 나노종이와 고분자복합필름

이선영 ( Sun Young Lee ),전상진 ( Sang Jin Chun ),도금현 ( Geum Hyun Doh ),이수 ( Soo Lee ),김병훈 ( Byung Hoon Kim ),민경선 ( Kyung Seon Min ),김승찬 ( Seung Chan Kim ),허윤식 ( Yoon Seok Huh ) 한국목재공학회 2011 목재공학 Vol.39 No.3

본 연구에서는 마이크로 입자의 셀룰로오스를 1.400 bar의 압력에서 고압 호모지나이저(high-pressure ho-mogenizer)를 이용하여 직경이 약 50~100 nm의 셀룰로오스 나노섬유를 제조하였다. 나노섬유 현탁액을 감압 여과하여 고강도 나노종이를 제조하였다. 용매 및 필름캐스팅법을 이용하여 나노섬유를 hydroxypropyl cellu-lose(HPC) 와 Polyvinyl alcohol (PVA) 수지에 보강 및 분산시켜 복합필름을 제조하였다. 고압 호모지나이저 통과 횟수를 2. 4. 6. 8까지 점점 증가시켰을 때. 나노종이의 인장강도가 매우 높았으며 통과횟수가 증가할수록 직선적으로 크게 향상되었다. IH, IH. 2H, 2H-perfluorodecyl-triethoxysilane (PFDTES)로 나노종이를 화학적 개질한 결과. 나노종이의 기계적 강도와 내수성이 크게 향상되었다. 셀룰로오스 나노섬유를 HPC와 PVA 수지에 중량대비 l. 3 및 5% 로 보강시켰을 때. HPC와 PVA 복합필름의 기계적 강도가 크게 향상되었다. Cellulose nanofibrils (CNF) with 50~100 nm diameter were manufactured from micro-size cellulose by an application of a high-pressure homogenizer at 1,400 bar. High strength nanopapers were prepared over a filter paper by a vacuum filtration from CNF suspension. After reinforcing and dispersing CNF suspension, hydroxypropyl cellulose (HPC) and polyvinyl alcohol (PVA)-based composites were tailored by solven- and film-casting methods, respectively. After 2, 4, 6 and 8 passes through high-pressure homogenizer, the tensile strength of the nanopapers were extremely high and increased linearly depending upon the pass number. Chemical modification of 1H, 1H, 2H, 2H-perfluorodecyl-triethoxysilane (PFDTES) on the nanopapers significantly increased the mechanical strength and water repellency. The reinforcement of 1, 3, and 5 wt% CNF to HPC and PVA resins also improved the mechanical properties of the both composites.

목재의 용액화 (Ⅱ) : 액화목재의 성분분석 Analysis of Liquefied Wood Components

도금현,공영토 한국목재공학회 1995 목재공학 Vol.23 No.2

This research was carried out to investigate the methods of liquefaction with Pinus koraiensis, and chemical components of the liquefied wood by FT-IR analysis and pyrolysis-GC/MS. Acetylated wood powder was liquefied above 90% in phenol or m-cresol when treated at about 150℃ for 30min., using some catalysts. Untreated wood powder was liquefied above 90% in phenol or m-cresol when treated at about 200℃ for 60min., using some catalsts. The results of FTIR analysis, carbohydrates were terribly disintegrated, the other side lignin peaks were occurred in Liquefied wood, particulary. The results of pyrolysis-GC/MS, the liquefied wood have clear four peaks, phenol, guaiacol, o-cresol and m-/p-cresol, due to degradation of lignin, particulary.

액화목재의 염소산염계 탈색처리

장준복,도금현 중부대학교 자연과학연구소 2001 自然科學硏究論文集 Vol.10 No.1

Liquefaction of the korean pine(Pinus koraiensis) was carried out in the presence of polyalcohols using sulfuric acid as a catalyst at 180℃, for 90 minutes. Liquefied wood was a dark brown color, many methods were tried to improve its color. The purpose of this study was improved the liquefied wood color. Liquefied wood were treated with sodium hypochlorite and sodium chlorite. The results of this work were as follows; sodium hypochlorites treatment of liquefied wood was no effects on improving of its color. In the sodium chlorites treatment of liquefied wood was effects on improving of its color. The effective treatment condition of liquefied wood for decoloring was at room temperature for 1 hour, sodium chlorite 2g, 3 times.

단판의 PEG 처리조건에 따른 합판의 성질

서진석,도금현 한국목재공학회 1989 목재공학 Vol.17 No.2

This study was carried out in order to investigate the treatment effect of PEG soln. which is a common dimensional stabilizer to green log, sawing panel etc, on bonding product including plywood widely-used in secondary processing unit. The 30% concentration of aqueous PEG soln. with molecular weight of 400. 1.000 and 4,000 were prepared respectively, and also dipping the veneer in the PEC soln., spreading the PEG soln. on veneer and mixing the PEG sole. in the adhesive were allowed. Then the ratio of PEG impregnation on veneer, the adhesive strength of plywood were epitomized as follows: 1. The ratio of impregnation by PEG 4,000 at dipping condition was highest, while that by PEG 400 at same condition was lowest. However, the effect of PEG molecular weight on the ratio of impregnation at spreading condition did not occur. 2. The adhesive strength was great in the order of 4,000$gt;400$gt;1,000 in molecular weight of PEG at dipping and spreading conditions. In case of mixing the PEG soln. in the adhesive, the adhesive strength was great in the order of 400$gt;1,000$gt;4.000 in molecular weight of PEG. Throughout three treatment conditions, PEG 400 was relatively favourable with about 10㎏/㎠ dry strength. 3. The adhesive strength was great in the order of spreading$gt;dipping$gt;mixing condition. 4. Although adhesive strength with the 30% concentration of aqueous PEG soln. was decreased by 3b% and over, compared to control (non-treatment) adhesive strength, all types of PEG treatment except mixing the PEG soln, in the adhesive exceeded the standard dry strength for common use panel, 7.5㎏/㎠. 5. In warm water-proof test, the adhesive strengths by all PEG treatment conditions were less than the standard wet strength. 7.5㎏ ㎠, and also delamination of glue line occured mostly in mixing in the PEG soln. in the adhesive condition.

감나무와 밤나무 수피(樹皮)를 이용한 합판 접착증량에 관한 연구

조재명,서진석,도금현 한국목재공학회 1988 목재공학 Vol.16 No.3

In order to investigate the extending effects tan urea-formaldehyde resin- or phenol- formal-dehyde resin- glued keruing plywood, hot pressing temperatures were controlled to 110, 140, 170 and 200℃. As the extender, wheat flour, persimmon bark powder, chestnut bark powder, the equivalently- extended with the above three powders, and diatomite powder were respectively mixed with 5, 10, 15 and 20% ratios to the resin liquid, and also with these the no- extended was allowed. Based on the measured bonding strength, the conclusions were drawn: 1. In the urea- formaidehyde resin, extending effects on the bonding strength were in the order of wheat flour, the equivalently- extended with the wheat flour, persimmon-and chestnut bark powder, persimmon bark powder, chestnut bark powder. In the phenol- formaldehyde resin, the. effects in the order of wheat flour, persimmon bark powder, diatomite powder, chestnut bark powder were resulted in. Specifically, superior bonding strength to the no-extended were given with the wheat flour and persimmon bark powder. 2. On the whole, the bonding strength decreased gradually, as the hot pressing temperature increased except for the diatomite powder extending.