• Journal of the Korean Wood Science and Technology
• /
• v.23 no.2
• /
• pp.19-25
• /
• 1995

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$^{\circ}C$ for 30min., using some catalysts. Untreated wood powder was liquefied above 90% in phenol or m-cresol when treated at about 200$^{\circ}C$ for 60min., using some catalysts. 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.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
• /
• 2011.04a
• /
• pp.262-266
• /
• 2011

본 연구에서는 건축물 내장 재료에 대한 연소독성평가와 독성지수연구로써 FT-IR을 이용한 연소가스분석실험을 하였다. 독성지수를 산정하기 위한 실험의 화재모델로 콘 칼로리미터 화재모델(KS F ISO/TR 9122-4)을 사용하였으며 ISO 19702의 절차에 따라 FT-IR을 이용하여 건축 재료의 연소로부터 발생되는 가스의 분석을 수행하였다. 국제규격에서 제시하고 있는 몇 가지 독성지수 산정법 중 ISO 13344에서 규정하는 방법에 따라 FED 값을 산정하였으며, 30분간 시험동물에 노출 시 대상의 50%가 사망하는 농도인 $LC_{50}$을 기준으로 하여 3가지 재료의 독성지수화를 통해 상대적인 독성 위험도를 평가하였다.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.5 no.6
• /
• pp.521-525
• /
• 2004

Biodegradation of poly(ethylene carbonate) (PEC) and their terpolymers has been investigated in vitro. PEC has been synthesized with ethylene oxide (EO) and carbon dioxide, which is one of the greenhouse gases using Zinc glutarate has been used as catalyst Carbonate terpolymers have been prepared by the use of EO, cyclohexene oxide(CHO), and carbon dioxide. High biodegradability of PEC and terpolymers with EO. has been observed. Very low biodegradation of poly(propylene carbonate) (PPC) and poly(cyclohexene carbonate) (PCHC) has been shown. The weight loss, FT-IR and SEM have been employed to characterize biodegradability.

• Journal of the Korean Society of Clothing and Textiles
• /
• v.23 no.8
• /
• pp.1161-1169
• /
• 1999

This research was aimed to identify the artifact type and their characteristics of the textile related materials excavated from Koryo Dynasty tombs of Hyungok-ni Danyang. Microscopy solubility test energy dispersive X-ray spectroscopy(EDS) and fourier transform infrared spectroscopy (FT-IR) fabric density test were used for the identification and when necessary standard samples were made in order to compare its characteristics with hose of the original artifact, the result indicated that the artifacts included both textile and paper. Artifacts from Burial 14 were comprised of textile fragments FT-IR and the solubility test conducted on the artifact indicated that the textiles were made with ramie woven with plain weave technique in a fairly loose fabric density. Rest of the artifacts were all comprised of paper.

• Applied Chemistry for Engineering
• /
• v.17 no.5
• /
• pp.504-508
• /
• 2006

Molecular weight of polyaniline is controlled in the range of oligomer to low molecular weight by controlling the ratio of aniline dimer (p-aminodiphenylamine) to monomer. Aniline dimers act as nucleation sites in chain growth during the polymerization of aniline. The molecular weights of polyanilines are estimated by GPS and relative viscosity measurement. The physical and chemical properties of polyanilines with various molecular weights are studied by UV-Vis, FT-IR, and electrical conductivity measurements.

• Fibers and Polymers
• /
• v.7 no.2
• /
• pp.105-111
• /
• 2006

Coating the fibre surface by in situ oxidative chemical polymerisation of polypyrrole (using $FeCl_3$ as oxidant) is a readily industrial applicable way to give electrical properties to wool with good ageing stability [1], although pre-treatments are required to avoid damage of the cuticle surface due to the acidic condition of the process. FT-IR and EDX analysis reveal that organic sulphonates and sulphates, used as dopants, are absorbed by wool, while chlorine ions are preferably embedded on the polypyrrole layer. The resulting electrical conductivity seems mainly due to the presence of chlorine as counter-ion of polypyrrole; nevertheless, the presence of arylsulphonate in the polymerisation bath increases the electrical conductivity of the coating layer.

• Journal of the Korean Ceramic Society
• /
• v.40 no.10
• /
• pp.985-990
• /
• 2003

By heat treating coal tar pitch between 450∼500$^{\circ}C$, mesophase pitch could be obtained. Subsequently, this pitch was oxi-stabilized between 160∼240$^{\circ}C$ in air for the purpose of reducing swelling and distortion. The mechanism of stabilization was analysed using the thermo-gravity and FT-IR. To investigate the effect of oxi-stabilization, the shore hardness and bending stress were measured with carbonized green body which was made from oxi-stabilized coal tar pitch.

• Journal of the Korean Ceramic Society
• /
• v.40 no.10
• /
• pp.1021-1026
• /
• 2003

Resin impregnation of carbon materials was affected by surface of carbon materials. The surface of carbon materials with coupling treatment improved comparability and wettability with resin, and that increased impregnation efficiency and properties of carbon materials. As a results of FT-IR, The silanol was coated on carbon surface with one layer. Coupling treatment of carbon materials increased impregnation efficiency, which improved porosity, mechanical strength, density and friction behavior.

• The Korean Journal of Ceramics
• /
• v.4 no.4
• /
• pp.372-376
• /
• 1998

Using calcium-phosphate-powder targets with the Ca/P ratios of 1.0-1.67, hydroxyapatite ($Ca_{10}(PO_4)_6(OH)_2$, HAp) thin films with 4-7㎛ thickness were prepared on titanium metal plates by r.f. magnetron sputtering, followed an annealing at $200^{\circ}C$ for 24 hr under a high water vapor pressure using an autoclave. All the specimens were systematically characterized by XRD, FT-IR, SEM and EDS analyses. The post-annealed films were confirmed to be a nonstoichiometric oxyhydroxyapatite by XRD and FT-IR measurements.

• Journal of Technologic Dentistry
• /
• v.38 no.3
• /
• pp.193-199
• /
• 2016

Purpose: The purpose of this study was to know of photopolymerization effect of self-etch dual-cured resin cement on different transmittance and thickness of zirconia disks. Methods: The two types of transparent and opaque zirconia speciments were prepared. The five speciments of each groups were seperated with 0.5mm and 1.0mm thickness. Degree of conversion(DC) were studied by FT-IR spectroscopy using ATR method before and after irradidaion for 40 sec. Results: The relative DC was showed the higher results of ZS5 as compared with ZS10 (p < 0.05). And OP5 and OP10 were lower results than ZS10 (p < 0.05). Conclusion: The photopolymerization effect of dual-cured resin cement were affected by the transmittance and thickness of zirconia.