Polymer Masking Method for a High Speed Roll-to-Roll Process

송준호,임수정,임세진,유재웅 한국고분자학회 2018 Macromolecular Research Vol.26 No.9

A new polymer masking system with photo-degradable material applicable to high-speed roll-to-roll vacuum deposition processing was studied. Specifically, a process using intense pulsed light to quickly and cleanly remove polymer masks was developed. Poly(methyl methacrylate) (PMMA) and TiO2 were blended together with the positive photoresist to prepare a photo-degradable polymer masking. Infrared spectroscopy confirmed that the positive photoresist moiety, diazonaphtoquinone, was photo-decomposed by white intense pulsed light. The process time required to remove the polymer mask was short enough that this method could be used even in high-speed roll-to-roll processes. It was confirmed that the polymer mask film could be easily removed even at a high process speed by using pressurized gas and adhesive roller tape. The transparent electrode was patterned using a polymer mask and an etching paste, and full solution processed inverted type OPV devices were fabricated. The fabricated OPV by direct etching showed a 94% efficiency compared with that of the reference device.

Continuous separation of copper ions from a mixture of heavy metal ions using a three-zone carousel process packed with metal ion-imprinted polymer

Jo, Se-Hee,Lee, See-Young,Park, Kyeong-Mok,Yi, Sung Chul,Kim, Dukjoon,Mun, Sungyong Elsevier 2010 Journal of chromatography A Vol.1217 No.45

<P><B>Abstract</B></P><P>In this study, a three-zone carousel process based on a proper molecular imprinted polymer (MIP) resin was developed for continuous separation of Cu<SUP>2+</SUP> from Mn<SUP>2+</SUP> and Co<SUP>2+</SUP>. For this task, the Cu (II)-imprinted polymer (Cu-MIP) resin was synthesized first and used to pack the chromatographic columns of a three-zone carousel process. Prior to the experiment of the carousel process based on the Cu-MIP resin (MIP-carousel process), a series of single-column experiments were performed to estimate the intrinsic parameters of the three heavy metal ions and to find out the appropriate conditions of regeneration and re-equilibration. The results from these single-column experiments and the additional computer simulations were then used for determination of the operating parameters of the MIP-carousel process under consideration. Based on the determined operating parameters, the MIP-carousel experiments were carried out. It was confirmed from the experimental results that the proposed MIP-carousel process was markedly effective in separating Cu<SUP>2+</SUP> from Mn<SUP>2+</SUP> and Co<SUP>2+</SUP> in a continuous mode with high purity and a relatively small loss. Thus, the MIP-carousel process developed in this study deserves sufficient attention in materials processing industries or metal-related industries, where the selective separation of heavy metal ions with the same charge has been a major concern.</P>

KIER의 열분해유화 공정 기술과 실증플랜트 소개

신대현(Shin, Dae-Hyun),전상구(Jeon, Sang-Gu),김광호(Kim, Kwang-Ho),이경환(Lee, Kyong-Hwan),노남선(Roh, Nam-Sun),이기봉(Lee, Ki-Bong) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05

Since late of 2000, KIER has developed a novel pyrolysis process for production of fuel oils from polymer wastes. It could have been possible due to large-scale funding of the Resource Recycling R&D Center. The target was to develop an uncatalyzed, continuous and automatic process producing oils that can be used as a fuel for small-scale industrial boilers. The process development has proceeded in three stages bench-scale unit, pilot plant and demonstration plant. As a result, the demonstration plant having capacity of 3,000 tons/year has been constructed and is currently under test operation for optimization of operation conditions. The process consisted of four parts ; feeding system, cracking reactor, refining system and others. Raw materials were pretreated via shredding and classifying to remove minerals, water, etc. There were 3 kind of products, oils(80%), gas(15%), carbonic residue(5%). The main products i.e. oils were gasoline and diesel. The calorific value of gas has been found to be about 18,000kcal/m³ which is similar to petroleum gas and shows that it could be used as a process fuel. Key technologies adopted in the process are 1) Recirculation of feed for rapid melting and enhancement of fluidity for automatic control of system, 2) Tubular reactor specially-designed for heavy heat flux and prevention of coking, 3)Recirculation of heavy fraction for prevention of wax formation, and 4) continuous removal & re-reaction of sludge for high yield of main product (oil) and minimization of residue. The advantages of the process are full automation, continuous operation, no requirement of catalyst, minimization of coking and sludge problems, maximizing the product(fuel oil) yield and purity, low initial investment and operation costs and environment- friendly process. In this presentation, background of pyrolysis technology development, the details of KIER pyrolysis process flow, key technologies and the performances of the process will be discussed in detail.

Numerical analysis of injection molding for filling efficiency on ultrasonic process

Jaeyeol Lee,김낙수,이재욱 한국유변학회 2008 Korea-Australia rheology journal Vol.20 No.2

In this study, we focus on the improvement of the filling efficiency in injection molding by application of ultrasonic vibration. While studies about the filling efficiency of typical filling processes in the injection molding have been widely performed, there have been only few studies about the filling efficiency of an ultrasonic process. The effect of the ultrasonic vibration is an important process condition, which influences the flow characteristics of polymer melt. This new condition even affects well-known injection conditions such as cavity pressure, injection temperature and mold temperature. For this study, we carried out a numerical analysis by appropriate modeling and analysis of the ultrasonic process in the filling process. To verify this numerical analysis, we compared the numerical results with the experimental data. Also, we analyzed the filling process in a thin cavity using this numerical analysis. To understand the flow characteristics of polymer melt in the ultrasonic process, we substituted real and complex vibration conditions with simplified and classified conditions according to the position of vibrating cavity surfaces and the phase difference between two opposing cavity surfaces. We also introduced MFR (melt flow ratio) as a new index to estimate the filling efficiency in the ultrasonic process.

Numerical analysis of injection molding for filling efficiency on ultrasonic process

Lee, Jae-Yeol,Kim, Nak-Soo,Lee, Jae-Wook The Korean Society of Rheology 2008 Korea-Australia rheology journal Vol.20 No.2

In this study, we focus on the improvement of the filling efficiency in injection molding by application of ultrasonic vibration. While studies about the filling efficiency of typical filling processes in the injection molding have been widely performed, there have been only few studies about the filling efficiency of an ultrasonic process. The effect of the ultrasonic vibration is an important process condition, which influences the flow characteristics of polymer melt. This new condition even affects well-known injection conditions such as cavity pressure, injection temperature and mold temperature. For this study, we carried out a numerical analysis by appropriate modeling and analysis of the ultrasonic process in the filling process. To verify this numerical analysis, we compared the numerical results with the experimental data. Also, we analyzed the filling process in a thin cavity using this numerical analysis. To understand the flow characteristics of polymer melt in the ultrasonic process, we substituted real and complex vibration conditions with simplified and classified conditions according to the position of vibrating cavity surfaces and the phase difference between two opposing cavity surfaces. We also introduced MFR (melt flow ratio) as a new index to estimate the filling efficiency in the ultrasonic process.

열가소성고분자 압출성형 시스템 개발 및 기초연구

김재열(JaeYeol Kim),정효희(HyoHee Jung),고명석(MyungSeok Ko),최승현(SeungHyun Choi),최진호(JinHo Choi),김종문(JongMun Kim),홍철(Cheol Hong) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.6

Have preserved perfectly polymer raw material of solid state or High horoscope at process at extrusion process and try much to heighten precision of raw material supply and processing perfectly. It is extrusion Screw and temperature pressure control system been hopper system and the most important parts among parts used at extrusion process. In printer roller incrustment development that is main target of system development applying system developed in research that serve that a lot of problems appear and supplements the problem in each system in case of operate extrusion system using heat range plasticity raw material among polymer raw material thus to extrusion molding system that use thermoplasticity polymer raw material correct and quantitative target achievement possibility will be done and will produce epoch-making and stable product in extrusion process that uses thermoplastic polymer raw material.

공정 효율 향상을 위한 연료전지전극 개발

박석정,이재승,이기섭,노범욱 한국수소및신에너지학회 2015 한국수소 및 신에너지학회논문집 Vol.26 No.6

For commercialization of fuel cell electric vehicles, one of the key objectives is to reduce cost of full stack assembly. Regarding Membrane Electrode Assembly, the major issue is to improve fuel cell activation process in the initial Hydrogen Oxidation Reaction and Oxygen Reduction Reaction. In this research, the VD (Vacuum Drying) process has been developed for improvement of activation process. The VD condition is developed by controlling the temperature and degree of vacuum to remove the remaining solvent of electrode. Consequently, the electrode applied to VD process showed the low characteristics such as 3.5% of remaining solvent content and the improved efficiency such as 15% of activation process speed.

Polymer structure and properties in micro- and nanomolding process

Hiroshi Ito,Hajime Suzuki,Kunihiko Kazama,Takeshi Kikutani 한국물리학회 2009 Current Applied Physics Vol.9 No.2

Injection molding of thin-wall parts with micro/nano-scale patterns using various polymers was performed to clarify the processability and surface replication of molded parts. Effects of process conditions on processability, higher-order structure and surface properties of molded parts were evaluated. The optical anisotropy in the vicinity of the gate became higher than at any other positions. The height replication ratio of surface patterns increased with increasing injection speed, holding pressure, injection temperature and mold temperature. In the case of nanomolding, negative birefringence toward the flow direction appeared higher than at the skin–shear region from the observation of skin–shear and core structure inside molded parts. Thus, the molecular orientation axis was oriented along the thickness direction because of deformation during the demolding process. Thermal stability of nano-surface patterns was influenced by the size of surface features and internal higher-order structure.

폴리머-탄소나노튜브 복합체 에어로졸 입자의 생성 및 이를 이용한 하이브리드 복합체 박막 제조

김휘동,안지영,김수형 한국입자에어로졸학회 2010 Particle and Aerosol Research Vol.6 No.2

In this paper, we describe a new method to form polymer thin films, in which carbon nanotubes (CNTs) are homogeneously distributed so that they can strengthen the mechanical property of resulting polymer film. To do so, we first homogeneously mixed CNTs with polymer in a DMF solvent. With the assistance of ultrasonic nebulizer, the polymer/CNT solution was then aerosolized into micro-sized droplets and finally turned into solidified polymer/CNT composite particles by gas-phase drying process. As the results of SEM and TEM analysis, CNTs were found to be homogeneously immobilized in the polymer matrix particles due to rapid drying process in the gas phase. For comparison purpose,(i) the polymer/CNTs composite particles prepared by aerosol processing method and (ii) polymer/CNTs sheets prepared by simple solution-evaporation method were employed to form polymer/CNTs composite thin films using a hot press. As the result, the aerosol processing of composite particles was found to be a much more effective method to form homogeneously distributed-CNTs in the polymer matrix thin film.

Preparation of Highly Cross-Linked, Monodisperse Poly(methyl methacrylate) Microspheres by Dispersion Polymerization; Part II. Semi-continuous Processes

Lee, Ki-Chang,Lee, Sang-Yun The Polymer Society of Korea 2008 Macromolecular Research Vol.16 No.4

In our previous publication, the problem of particle deformation and coagulation at the nucleation stage in the presence of cross-linker was intensely studied by seeded batch dispersion polymerization of methyl methacrylate (MMA). In the present work, highly cross-linked, monodisperse PMMA particles were prepared under various reaction conditions by seeded semi-continuous process. Monodisperse, $6.5{\mu}m$-diameter PMMA particles containing up to 8 wt% of DVB or EGDMA were successfully made by seeded semi-continuous process and multi-semi-continuous addition process, respectively. Therefore, this study shows that seeded semi-continuous process is more effective and efficient to prepare highly cross-linked, monodisperse particles than non-seeded and seeded batch processes.