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α - 셀룰로오즈의 열분해에 관한 연구 : 산촉매 NaCl 의 영향 Effect of Acid Catalsts NaCl
나상도,황준호,최경선,설수덕,손진언 한국고무학회 1996 엘라스토머 및 콤포지트 Vol.31 No.2
The Thermal decomposition of the α-Cellulose and NaCl was studied using a thermal analysis technique in the steam of nitrogen gas with 30㎖/min at various heating ranges from 4 to 20℃/min. The Derivative and Integral method used to be obtained values of activation energy of decomposition reaction. 1. The values of activation energy evaluated by Derivative and Intergral method were consistent with each other very well. 2. The maximum value of heat of decomposition evalated by DSC method was α-Cellulose/NaCl=90/10. 3. The thermogravimetric trace curve agreed with the theoretical equation.
Poly(methy methacrylate-co-chloro phenyl acetylene)의 열 및 전기적 특성
나상도,김동건,설수덕 동아대학교 공과대학 부설 한국자원개발연구소 1995 硏究報告 Vol.19 No.2
The thermal degradation behavior of poly(alkyl methacrylate) and conducting polymer, poly(chloro phenyl acetylene)(PCPA) mixture was analyzed using the gel permeation chromatography(GPC), pyrolysis gas chromatography(PGC) and thermog-ravimetric analyzer(TGA) under nitrogen gas flow of 30 ml/min at various heating rates ranging from 4 to 20℃/min. According to increasing temperature and frequency, electrical properties were analyzed using the LCR meter and electrometer. The morphological analysis at interface of mixture was carried out using the scanning electron microscopy(SEM) and energy dispersive spectrometer(EDS). The values of activation energy of thermal degradation in the mixture determined using the Fried-man's method were 37∼61 Kcal/mol. The thermal degradation mechanism of PMMA and PCPA mixture was observed to be main chain scission under nitrogen environment. The values of activation energy using electric conductivity determined above and bellow of the glass transition temperature were 0.501∼0.848 eV and 0.201∼0.451, respectively.
겔 투과 크로마토그라피법에 의한 페 메타크릴산메칠수지와 스티렌계열수지화합물의 열분해 메카니즘에 관한 연구
나상도,설수덕 동아대학교 환경문제연구소 1995 硏究報告 Vol.18 No.2
The mechanism of thermal degradation in blend of polymethyl methacrylate (PMIMA), styrene Copolymers such as (α-styrene-co-acrylonitrile) Copolymer(SAN), (acrylonitrile-butadiene-acrylonitri1e)terpolymer(ABS) were analyzed using the thermal analysis, gel permeation chromatography, pyrolysis gas chromatography and infra-red apectroscopy in the stream of nitrogen. · It has been shown that the depolymerization of blends were a radical chain reaction and that degradation in the region of 300-400 C is associated with initiation by scission of the polymer at random along its length to from radicals. · The dominant process in the degradation of PMMA-PS blend was main chain scission randomly due to weak link except PMMA-SAW and PMMA-ABS blend below 300 ℃ under nitrogen environment. · The aimplest depolymerization reaction is that of PMMA from which monomer is obtained 90% over is PS, SAN and ABS blends.
α-셀룰로오즈의 열분해에 관한 연구(Ⅱ) : 산촉매 ZnCl₂의 영향 Effect of Acid Catalysts ZnCl₂
설수덕,나상도 東亞大學校 1996 東亞論叢 Vol.33 No.-
The thermal decomposition of the α-Cellulose and ZnCl₂was studied using a thermal analysis techniques in the steam of nitrogen gas with 30m1/min at various heating rates from 4 to 20℃/min. The Derivative and Integral method were used to obtained values of activation energy of decomposition reaction. 1 The values of activation energy evaluated by Derivative and Intergral method were consistent with each other very well. 2. The maximum value of heat of decomposition evaluated by DSC method was α- Cellulose/ZnCl₂= 90/10. 3. The thermogravimetric trace curve agreed with the theoretical equation.
나상도(Sang Do Na),김보민(Bo Min Kim),유완석(Wan Suk Yoo) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
The paper presents a lumped parameter vehicle dynamic modeling method that includes kinematic characteristics of suspensions. The relative displacement and orientation of a wheel with respect to car body are represented as a function of the vertical displacement of the wheel. The vehicle is modeled as five bodies (chassis, 4 wheels) by using ADAMS. The equation of motion of the vehicle is consisted in terms of the chassis local coordinates which do not require coordinates transformation to enhance efficiency in dynamic analysis. The analysis results were compared with ADAMS results to verify the accuracy.