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주쇄에 긴 유연 사슬을 갖는 열방성 액정고분자의 유변학적 특성 및 물성
신부영 嶺南大學校工業技術硏究所 1992 연구보고 Vol.20 No.2
Two thermotropic homopolymers and copolymer based on two bisphenol monomers and terephthaloyldichloride were prepared via melt polymerization. The optical characteristics of polymers were nematic thread schlieren textures. Fibers from liquid crystalline polymers were spun at the mesophase of molten state. The flow curve showed yield stress and the fibers based on such polymer had high tensile moduulus. Those mechanical properities could be explained by the relaxation times of polymers and X-ray patterns of fibers.
신부영,Kyung Su Kang,Sang Il Lee,이태진,Ramani Narayan 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.3
The effect of chemically modified thermoplastic starch (CMPS) on the thermal properties and isothermal crystallization kinetics of poly(lactic acid) (PLA) was studied by differential scanning calorimetry (DSC) and compared to that of granular starch and an inorganic nucleating agent, talc. Nucleated PLA showed an additional crystallization of PLA, which affected the melting temperature. The crystallinity and crystallization rate of PLA were considerably enhanced by addition of CMPS, even at 0.1% content, and the amount of the CMPS had little effect on the thermal properties and isothermal crystallization kinetics of PLA. The effect of CMPS as a nucleating agent was comparable to that of granular starch but slightly less than that of talc. However, CMPS can offer a fully biodegradable nucleating agent with no residues remaining for the biobased and biodegradable polymers
교양기초중국어 수업에서 학생 개인차를 고려한 수업전략연구 - 학생 보조 교사의 활용
신부영 한국중국언어학회 2019 중국언어연구 Vol.0 No.83
In this article, we discussed how to use student proctor as a way to solve the students’ individual differences in liberal basic Chinese language classes. The trend of future education is that cooperative learning through cooperation among classmates is becoming important considering students’ various individual differences. This article focuses on how to improve the effectiveness of learning Chinese language and students’ satisfaction by considering the various students’ individual differences. First, a survey was conducted to check and diagnose the degree of differences among students in Chinese language classes. Second, this article explained how to use student proctor to help students with difficulties in learning through group cooperative study. Third, it offers a concrete example of class considering individual difference using student proctor in class. Based on this, I am going to suggest effective improvement measures for liberal Chinese language education. 이 글에서는 대학교 교양기초중국어 수업에 존재하는 학생들의 개인차를 해결하기 위한 방안으로 학생 보조교사를 활용하는 방법에 대해 논하였다. 미래교육의 추세는 학생의 다양한 개인차를 고려하여 급우간의 협동을 통한 협동학습이 중요시 되고 있다. 이에 본 고에서는 중국어 수업을 진행할 때 어떻게 하면 학생간의 다양한 개인차를 고려하여 모든 학생들이 만족하며 중국어 학습효율을 높이느냐에 중점을 두었다. 이를 위하여 첫째, 중국어 수업시간에 존재하는 학생개인차 정도를 확인하고 진단하는 조사를 실시하였고, 둘째, 조별협동학습을 통해 학습에 곤란함이 있는 학생의 학습보조를 위해 학생 보조교사를 활용하는 방안에 대해 설명하였으며, 셋째, 실제적인 수업시간에 학생 보조교사를 활용한 개인차 수업의 실례를 제시하였다. 이를 바탕으로 교양중국어교육의 효과적인 개선 방안을 제시하고자 한다.
Viscoelastic properties of PLA/PCL blends compatibilized with different methods
신부영,한도흥 한국유변학회 2017 Korea-Australia rheology journal Vol.29 No.4
The aim of this study was to observe changes in the viscoelastic properties of PLA/PCL (80/20) blends produced using different compatibilization methods. Reactive extrusion and high-energy radiation methods were used for blend compatibilization. Storage and loss moduli, complex viscosity, transient stress relaxation modulus, and tan δ of blends were analyzed and blend morphologies were examined. All compatibilized PLA/PCL blends had smaller dispersed particle sizes than the non-compatibilized blend, and well compatibilized blends had finer morphologies than poorly compatibilized blends. Viscoelastic properties differentiated well compatibilized and poorly compatibilized blends. Well compatibilized blends had higher storage and loss moduli and complex viscosities than those calculated by the log-additive mixing rule due to strong interfacial adhesion, whereas poorly compatibilized blends showed negative deviations due to weak interfacial adhesion. Moreover, well compatibilized blends had much slower stress relaxation than poorly compatibilized blends and didn’t show tan δ plateau region caused by slippage at the interface between continuous and dispersed phases.
TGA 방법을 이용한 플라스틱과 하수·분뇨슬러지의 열분해 반응속도 연구
윤효숙,최성필,김성탁,원양수,신부영 嶺南大學校 環境問題硏究所 1997 環境硏究 Vol.16 No.2
요약문 도시 고형폐기물의 열분해 특성에 대한 기초 자료를 제시하고자 열중량분석기를 이용하여 가열속도를 실험변수로 하여 하수 및 분뇨슬러지와 5대 범용 플라스틱인 LDPE, HDPE, PP, PS 와 PVC의 열분해 반응속도인자 및 분해특성을 파악하였다. 활성화에너지는 가열속도에 상관없이 일정한 값을 나타내었으며 분해속도가 최고일때의 온도는 가열속도가 증가함에 따라 증가하였다. LDPE, HDPE, PP와 PS는 1단계 분해반응으로 350∼520 ℃에서 대부분이 완전분해되었으며, PVC는 2단계 분해반응으로 250∼550 ℃에서 분해가 진행되었다. 슬러지는 여러 단계의 분해반응으로 특정한 분해구간이 없이 전구간에 걸쳐서 분해가 진행되었다. PVC를 제외한 플라스틱은 완전분해되었으며, PVC는 약 10%의 잔류량이 있었고, 슬러지의 잔류량은 D 하수, S 하수, T 분뇨 슬러지의 순으로 43, 70, 28.5%를 나타내었다.Abstract The thermal decomposition of sewage/night soil sludge and LDPE, HDPE, PP, PS and PVC was studied by using a conventional dynamic thermogravimetric analyzer (TGA) in a flowing nitrogen environment at several heating rates between 5 ℃ and 40 ℃/min. The dynamic thermogravimetric analysis curve was analyzed to obtain the information on the kinetic parameters such as activation energy, reaction order, and Arrhenius preexponential factor. The activation energy keeps constant regardless of heating rates, and the temperature of he fastest decomposition increases with the heating rate. LDPE, HDPE, PP and PS were completely decomposed in the temperature range of 350∼520 ℃ including as the first step decomposition and PVC was decomposed in the temperature range of 250∼550 ℃ including the second step decomposition. Sludge was decomposed without specific temperature range as several decomposition step. Except of PVC, all plastics were decomposed completely. PVC keeps the remains of about 10%, and sludge keeps the remains of 43% for D sewage sludge, 70% for S sewage sludge, 28.5% for T night soil sludge.