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Vinyl 단양체의 펄프섬유에 대한 Graft중합(제1보)
주혁종,한순교,맹기석,Ju, Hyeok-Jong,Han, Sun-Gyo,Maeng, Gi-Seok 한국섬유공학회 1973 한국섬유공학회지 Vol.10 No.3
Various monomers (Acrylonitrile, Vinyl acetate, Methyl methacrylate, Styrene) have been grafted onto cellulose pulps. Physical properties of the grafted pulps have heen studied and the results are: 1) increasing amount of water added to the pulp led to an increase in grafting yield, although above 30% water no further increase. 2) Increasing amount of grafted to the pulp A) led to an increase in diameter of fiber. B) led to a decrease in water sorption of the fiber. C) led to a decrease in density of the fiber. D) led to a decrease in the strength of single fiber. E) led to a decrease in beatability of the fiber.
졸-겔법으로 알루미나를 도포한 탄소/탄소 복합재의 산화 억제효과
주혁종,최돈묵,김영국,권호길,Ju, Hyeok-Jong,Choe, Don-Muk,Kim, Yeong-Guk,Gwon, Ho-Gil 한국재료학회 1993 한국재료학회지 Vol.3 No.4
탄소/탄소 복합재의 산화 저항성을 개선시키기 위하여 aluminum iso propoxide및 aluminum tri sec butoxide졸을 2D-탄소/탄소 복합재에 도포하여 산호 억제층으로서의 효과를 관찰하였다. 촉매/알콕사이드의 몰비가 0.07, 물/알콕사이드의 몰비가 100일때의 산화 억제효과가 양호했으며, 승온속도를 $20^{\circ}C$/min로 하여 승온분석시험한 결과는 도포시편이 $80^{\circ}C$ 정도의 산화 개시온도가 20%감소되는 시간을 측정한 TGA분석에서는 도포시편이 20% 정도의 산화 저항성 개선효과를 나타냈다. 도포막의 두께는 1회 도포막이 3${\mu}$m, 2회 및 3회 도포막이 4-5${\mu}$m 정도였고, 열충격 시험은 횟수에 따라 산화량이 증자하였다. 5% 전환률에서의 도포하지 않은 시편의 활성화 에너지는 33.2Kcal/mole이었으며 도포시편의 활성화 에너지는 37.1Kcal/mole이었다. In order to improve the oxidative resistance of carbon/carbon composites, aluminium-isopropoxide and aluminium-tri-sec-butoxide sol were coated on the surface of 2D--carbon/carbon composiles and the effects uf coating were investigated. The effects of oxidative resistance were dominant in the case of catalyst/alkoxide mole ratio, 0.07, and $H_2O$/alkoxide mole ratio, 100. Through the dynamic TGA analysis with the heating rate of 20%/min, oxidative initiation tempera~ ture was enhanced about $80^{\circ}C$. The oxidative resistance effects of alkoxide sol were improved according to the times of coating. Also the 20% weight loss time of coated samples by TGA analysis was 20% better than that of un~ coated samples. The thickness of 1^{st} coated layer was about 3${\mu}$m and that of $2^{nd}$ and $3^{nd}$ coated layers was about respectively 4~5${\mu}$m and the weight loss were increased with the increasing of thermal shock test times.