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전도성 Polypyrrole 의 분해 특성과 물성 개선
이홍기,엄정호,박수길,심미자,김상욱,이주성 ( Hong Ki Lee,Jung Ho Eom,Soo Gil Park,Mi Ja Shim,Sang Wook Kim,Ju Seong Lee ) 한국공업화학회 1994 공업화학 Vol.5 No.5
친핵성용매하에서 p-toluenesulfonic acid나 bezensulfonic acid와 같은 유기산을 지지전해질 겸 dopant로 사용하여 전도성 polypyrrole필름을 전해중합하였고 분해 특성과 기계적 물성증가에 대하여 고찰하였다. Dimethyformamide/p-toluenesulfonic acid에서 합성한 polypyrrole 필름이 전도도 10-40S/㎝, 인장강도 25N/㎟. 연신율은 10%로 가장 좋은 특성을 나타내었다. 또한 전해중합시 최적 조건은 0.5M의 pyrrole과 0.5M의 p-toluenesulfonic acid를 첨가하여 정전류법에서는 2㎃/㎠의 전류밀도가, 정전위법으로는 0.9V vs. Ag/Ag^+에서 중합할 때였으며 생성된 필름은 공기중에서 안정하였고 도핑, 탈-도핑이 가역적이어서 2차 전지로서의 특성을 갖고 있었다. 온도에 따른 분해과정이 1차 반응으로 dopant 음이온이 분해반응에 관여하지 않아 산화안정성이 좋았으며 분해활성화 에너지는 1.01JK^(-1)mol^(-1), 25℃에서의 분해 속도상수는 3.1×10-7min^(-1)였다. 여러 가지 host polymer와의 composite를 검토한 결과 인장강도는 50%, 연신율은 100% 정도로 기계적 물성을 증가시킬 수 있었다. Electrochemical synthesis of conductive polypyrrole films was carried out in nucleophilic solvent containing p-toluenesulfonic acid or bezensulfonic acid as supporting electrolyte and dopant. Also characteristics of degradation and improvement of mechanical properties were studied. The conductivity, tensile strength and elongation of the films obtained in dimethyformamide/p-toluenesulfonic acid had the highest value of 10-40S/㎝, 25N/㎟ and 10%, respectively. The optimum condition of electrochemical synthesis was 2㎃/㎠ for constant current method and 0.9V for constant potential method containing 0.5M pyrrole and 0.5M p-TSA. The obtained films showed good stability in air and electrode characteristics of secondary battery by reversibility in doping and undoping. The degradation process was 1ST order reaction at various temperature. The activation energy and rate constant of degradation reaction were 1.01JK^(-1)mol^(-1) and 3.1×10^(-7)min^(-1) respectively at 25℃. For the improvement of mechanical properties, composition of polypyrrole films with various host polymer were investigated and increase of tensile strength and elongation was confirmed.
이홍기(Hong-Kee Lee),손성호(Seong-Ho Son),이호영(Ho-Young Lee),구석본(Seok-Bon Koo),전준미(Jun-Mi Jeon) 한국표면공학회 2006 한국표면공학회지 Vol.39 No.4
Ni-SiC composite coating layers were prepared by electroplating method and their deposition rate, codepo-sition of SiC, morphology, surface roughness, hardness, wear and friction properties were investigated. It was found that the deposition rate and the codeposition of SiC in the composite coating layer increased with increasing concentration of SiC in the solution only at the early stage. Both of them reached certain maxima and then decreased with increasing concentration of SiC. Rough surface was obtained with increasing codeposition of SiC, which is probably due to the agglomeration of the SiC particle in the vicinity of surface. Vickers hardness increased with increasing codeposition of SiC and heat treatment at 300℃ in air for 1 hour. Wear volume decreased with increasing codeposition of SiC and friction coefficient increased with increasing codeposition of SiC at the early stage, and it became almost constant. Such wear and friction behaviors are desirable for the practical application.
SiC 나노입자를 이용하여 형성한 Ni-SiC 복합도금막의 미세구조 및 특성
이홍기(Hong-Kee Lee),손성호(Seong-Ho Son),이호영(Ho-Young Lee),전준미(Jun-Mi Jeon) 한국표면공학회 2007 한국표면공학회지 Vol.40 No.2
Ni-SiC composite coating layers were formed using two kinds of SiC nano-particles by DC electrodeposition in a nickel sulfamate bath containing SiC particles. The effect of stirring rate and SiC particle type on the microstructure and properties of Ni-SiC composite coating layers were investigated. Results revealed that the trend of deposition rate is closely related to the codeposition of SiC and the deposition rate of nickel, and the codeposition behavior of SiC can be explained by using hydrodynamic effect due to stirring. The average roughness and friction coefficient are closely related to the codeposition of SiC and SiC particle size. It was found that the Vickers microhardness of the composite coating layers increased with increasing codeposition of SiC. The composite coating layers containing smaller SiC particle showed higher hardness. This can be explained by using the strengthening mechanism resulting from dispersion hardening. Anti-wear property of the composite coating layers formed using 130 ㎚-sized SiC nano-particles has been improved by 2,300% compared with pure electroplated-nickel layer.
이홍기(Hong-Kee Lee),손성호(Seong-Ho Son),이호영(Ho-Young Lee),전준미(Jun-Mi Jeon) 한국표면공학회 2007 한국표면공학회지 Vol.40 No.1
Ni coating layers were formed using a newly developed electroless Ni plating solution. The properties of Ni coating layer such as internal stress, hardness, surface roughness, crystallinity, solderability and surface morphology were investigated using various tools. Results revealed that internal stress decreased with plating time and reached 40 N/㎟ at 20 minutes of the plating time. Hardness increased with increasing P content and thickness. Surface roughness of the pad decreased with Ni and Ni/Au plating. Crystallinity decreased with increasing P content. Solderability based on wettability decreased with Ni and Ni/Au plating. Based on surface morphology, it is expected that Ni coating layer formed using a newly developed electroless Ni plating solution is lower than that formed using a commercial electroless Ni plating solution in possibility of black pad occurrence.
무전해 니켈 도금용액에 사용되는 안정제의 도금피막 특성에 미치는 영향
이홍기(Hong-Kee Lee),손성호(Seong-Ho Son),전준미(Jun-Mi Jeon),구석본(Suck-Bon Koo),허진영(Jin-Young Hur) 한국표면공학회 2004 한국표면공학회지 Vol.37 No.6
Bath stabilizers in the electroless nickel(EN) plating solution are known to prevent sudden bath decomposition and extend its lifetime. Further, every stabilizer has a different role and function in EN solution and it influences the surface structure. In this study, the effects of various stabilizers on the deposition rate, surface morphology, deposition content of phosphor and hardness were investigated.
이홍기(Lee Hong Ki),전형호(Chun hyung ho),탁태오(Tak Tae Oh) 강원대학교 산업기술연구소 2001 産業技術硏究 Vol.21 No.1
In this study, a driver model based on the lead-lag controller for stable maneuver of a highly nonlinear, multi-dimensional, numerically stiff multibody vehicle model according to the various handling test requirements such as steady-state cornering, double lange change, etc. is presented The lead-lag controller is developed with lead and lag compensation. Which use the transfer function with cross-over frequency by frequency response method. The proposed driver model is applied to a vehicle model in steady-state and slalom maneuver to verify its effectiveness and validity. The results show that the proposed path control strategy is excellent both in pursuing the desired course and stability of the vehicle.