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PCB용 Glass/Epoxy 프리프레그의 경화중 점성거동 연구
諸葛英淳,尹南畇 論文集 1999 論文集 Vol.16 No.2
This paper dealed the studies on the viscosity behaviors of glass/epoxy prepreg for PCB during the cure process. The dynamic scan of glass/epoxy prepreg using DSC showed that the exothermic reaction started at the temperature of 118℃. The peak temperature was 169.7℃ and the total reaction enthalpy (ΔH) was 13.54I/g. The results of ion viscosity behaviors of this prepreg system using dielectrometer exhibited the lowest ioniviscosity at about 115℃, and then the ionic viscosity was gradully increased upto 150℃. This indicated that the cure reaction of this prepreg started at 115℃ and the molecular weight was increased by the accelerated thermal cross-linking reaction.
葛英淳,黃泰耿 慶一大學校 1997 論文集 Vol.14 No.2
With PATRAN/ABAQUS(standard), FEA(Finite element Analysis) of E-glass/VinyI ester chemical resistant composite tank with holes was performed. The purpose of this investigation was to determine the deformation behavior and structural safety under the maximum storage weight condition of chemical mixtures with 1.3g/cm³of density. Laminated shell element in ABAQUS has applied to calculate the stress and strain for each laminated layer. Maximum failure stress theory and Tsai-Wu failure theory have applied to evaluate the structural safety factor of composite tank. FEA results showed that the large hole is the most weaken area and the minimum structural safety factor is evaluated to be about 4 on a basis of the first ply failure theory.
카본/페놀 복합재료의 제조와 그 전기전도성에 관한 연구
葛英淳,李才熙,陳省昊,張相熙,李馨植 慶一大學校 1997 論文集 Vol.14 No.2
The mechanical properties and electrical conductivity of spun carbon fiber/phenolic composites were tested and evaluated. The tensile and flexural strengths of carbon/phenolic composite specimens were 16.8 ksi and 25.0 ksi, respectively. The electrical conductivities of carbon/phenolic specimens were generally similar in the all range of test temperatre. The lowest electrical conductivity was observed at 150℃, which is originated from the morphology change due to the glass transition of cured phenolic matrix. The activation energy on the conductivity at the temperature range of 150∼190℃ was 0.196 eV.
내식성 복합재구조물 제작용 비닐에스테르 수지의 조성 및 그 특성에 관한 연구
제갈영순 경일대학교 산업기술연구소 1999 産業技術硏究所 論文集 Vol.6 No.-
This paper dealed the studies on the fomulation and properties of vinyl ester resin for chemical resistant composite structures. The chemical structure of vinyl ester, Derakane 510A-40 and its hardener were characterized by H-NMR, ¹³C-NMR and infrared spectroscopies. The Derakane 510A-40 resign was identified to be have the structure of tetrabromobisphenol A epoxy-baed vinylester carrying the enthylenically unsaturated end groups. The spectral analysis on vinylester hardener indicated that is composed of methyl ethyl ketone peroxide and inactive aromatic compounds. The test on the mechanical and thermal properties of cure vinyl ester specimens were also tested. The tensile strength and modules wer 10,300 psi and 480 Ksi, whereas the flexural strength and modulus wer 17,200 psi and 520 Ksi. The heat deflection temperature of cured vinyl ester resin was 107℃.
Gal, Yeong-Soon,Jin, Sung-Ho,Park, Jong Wook,Lim, Kwon Taek Informa UK (TaylorFrancis) 2015 Molecular Crystals and Liquid Crystals Vol.618 No.1
<P>A new poly(aryleneethynylene) was synthesized from the palladium-catalyzed carbon-carbon coupling condensation of 4-[(tert-butyldimethylsiloxy)methyl]-1,6-heptadiyne and p-diiodobenzene. This polymerization proceeded well in mild reaction conditions to give a high yield of polymer (92%). The polymer structure was characterized by such instrumental methods as infrared and NMR spectroscopies. This polymer was completely soluble in common organic solvents such as chloroform, chlorobenzene, toluene, and xylene. The X-ray diffractogram of polymer powder showed that this polymer is amorphous. In the DSC thermogram of polymer, a broad exothermic peak was observed around 205 degrees C (started at 140 degrees C) in the first heating, whereas there was no exothermic peak in the second heating. When this polymer was excited at 272 nm, it gave PL maximum emissions at 327 and 380 nm.</P>
Gal, Yeong-Soon,Jin, Sung-Ho,Lee, Won-Chul,Kim, Sang-Youl The Polymer Society of Korea 2004 Macromolecular Research Vol.12 No.4
A new hydroxyl group-containing conjugated ionic polymer, poly[2-ethynyl-N-(p-hydroxyphenylethyl)pyridinium bromide], was synthesized by the activated polymerization of 2-ethynylpyridine with p-(2-bromoethyl) phenol without any additional initiator or catalyst. The polymerization proceeded well to give a moderate yield (65%) of polymer at a reaction temparature of 90$^{\circ}C$. Another polymer, poly[2-ethynyl-N-(p-hydroxyphenylethyl)pyridinium tetraphenylborate], was readily prepared by the ion-exchange reaction of poly[2-ethynyl-N-(p-hydroxyphenylethyl)pyridinium bromide] with sodium tetraphenylborate. These polymers were completely soluble in organic solvents such as DMF, DMSO, and acetone, but insoluble in water and ether. Instrumental analyses, such as NMR, IR, and UV-Vis spectroscopies, indicated that the new materials have conjugated polymer backbone systems with the designed substituents and counter anions. X-Ray diffraction analyses of the polymers indicated that they were mostly amorphous.
Gal, Yeong-Soon,Jin, Sung-Ho,Lee, Hyung-Jong,Kim, Sung-Hyun,Kim, Won-Chul,Park, Sam-Kwon The Polymer Society of Korea 2003 Macromolecular Research Vol.11 No.2
The polymerization of a cyclopolymerizable disubstituted dipropargyl ether, his(3-trimethylsilyl-2-propynyl)ether (BTPE), was attempted by various transition metal catalysts. The yield for the polymerization of BTPE was generally low, which is possibly due to the steric hindrance of bulky substituents. In general, the catalytic activities of Mo-based catalysts were found to be greater than those of W-based catalysts. The highest yield was obtained when the MoCl$_{5}$,-EtAlCl$_2$(1:2) catalyst system was used. The copolymerization of BTPE and diethyl dipropargylmalonate yielded a random copolymer with conjugated polymer backbone. However the polymers were partially desilylated, depending on the reaction conditions. The thermal and morphological properties of the resulting polymers were also discussed.d.
Synthesis and Properties of Conjugated Cyclopolymers Bearing Fluorene Derivatives
Gal Yeong-Soon,Jin Sung-Ho,Lee Hyo-San,Kim Sang Youl The Polymer Society of Korea 2005 Macromolecular Research Vol.13 No.6
Fluorene-containing, spiro-type, conjugated polymers were synthesized via the cyclopolymerization of dipropargylfluorenes (2-substituted, X=H, Br, Ac, $ NO_{2}$) with various transition metal catalysts. The polymerization of dipropargylfluorenes proceeded well using Mo-based catalysts to give a high polymer yield. The catalytic activities of the Mo-based catalysts were found to be more effective than those of W-based catalysts. The palladium (II) chloride also increased the polymer yield of the polymerization. The polymer structure of poly(dipropargylfluorene)s was characterized by such instrumental methods as NMR ($^{1}H_{-}$, $^{13}C_{-}$), IR, UV-visible spectroscopies, and elemental analysis as having the conjugated polymer backbone bearing fluorene moieties. The $^{13}C_{-}$NMR spectral data on the quaternary carbon atoms in polymers indicated that the conjugated cyclopolymers have the six-membered rings majorly. The poly(dipropargylfluorene) derivatives were completely soluble in halogenated and aromatic hydrocarbons such as methylene chloride, chloroform, benzene, toluene, and chlorobenzene. The poly(dipropargylfluorene) derivatives were thermally more stable than poly(dipropargylfluorene) itself, and X-ray diffraction analyses revealed that the polymers are mostly amorphous. The photoluminescence peaks of the polymers were observed at about 457-491 nm, depending on the substituents of fluorene moieties.
Gal, Yeong-Soon,Jin, Sung-Ho,Park, Jong Wook American Scientific Publishers 2014 Journal of nanoscience and nanotechnology Vol.14 No.8
<P>A new ionic polyacetylene derivative with furoyl substituents was prepared by the uncatalyzed polymerization of 2-ethynylpyridine by using 2-furoyl chloride in high yield. The polymer structure was characterized by such instrumental methods as NMR, IR, and UV-visible spectroscopies to have a polyacetylene backbone system with the N-(2-furoyl)pyridinium chloride. The electro-optical and electrochemical properties of poly[2-ethynyl-N-(2-furoyl)pyridinium chloride [PEFPC] were studied. The photoluminescence spectrum showed that the PL peak is at 578 nm corresponding to the photon energy of 2.15 eV. The cyclovoltammograms of PEFPC exhibited the irreversible electrochemical behaviors between the oxidation and reduction peaks. The oxidation current density of polymer versus the scan rates is approximately linear relationship in the range of 30 mV/sec-150 mV/sec. It was found that the kinetics of redox process is controlled by the reactant diffusion process from the oxidation current density of PEFPC versus the scan rates.</P>