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양 말단에 MPTMS-아크릴아미드로 치환된 폴리이미드의 합성
민준호,박찬영,민성기,Min, Jun Ho,Park, Chan Young,Min, Seong Kee 한국재료학회 2016 한국재료학회지 Vol.26 No.9
An amide group was introduced to restrain the cohesion of silica nano-particles and copolymerized with polyamic acid. Amide block copolymers were prepared using silica and (3-mercaptopropyl) trimethoxysilane (MPTMS) with a siloxane group, using 2, 6-Lutidine as a catalyst. Amide block polymers and copolymers were synthesized via ATRP after brominating pyromellitic dianhydride (PMDA) and polyamic acid of methylene diphenyl diamine (MDA) using ${\alpha}$-bromo isobutyryl bromide. Characteristic peaks of copolymer with amide and imide groups and patterns of amorphous polymers were studied using FT-IR and XRD analyses; an analysis of the surface characteristic groups was conducted via XPS. Changes in the thermal properties were examined through DSC and TGA; solubility for solvents was also studied.
실리카 나노입자를 이용한 아미드–이미드 공중합체의 합성과 성질
민준호(Jun Ho Min),박찬영(Chan Young Park),민성기(Seong Kee Min) 한국고분자학회 2016 폴리머 Vol.40 No.6
아미드기가 포함된 개질화된 silica nanoparticle에 폴리이미드 유도체를 3차 아민계 화합물인 1,4-diazabicyclo[2.2.2]octane를 이용하여 공중합하여 합성한 폴리아미드-이미드의 열적 성질 및 물리적 특성을 검토하였다. 단위체 합성(MP, AMP, PA, PAB)과 DABCO를 이용한 중합체의 합성(PAAMP1, PABAMP1)을 EA, FTIR, TGA, XPS, XRD, SEM 등을 통하여 이미드화의 공중합체를 확인하였다. XPS data에서 PAB의 Br(3d)가 68.63 ev에 중합된 것이 확인되었으나 PABAMP1에서는 거의 나타나지 않았고 용매에 대한 용해도 조사에서 공중합체의 강인한 이미드기와 말단 부분의 실록산 세그멘트가 용해도에 영향을 끼쳤으며 극성 용매인 NMP에서 용매화 현상으로 접촉각이 85~88°에서 63~65°로 감소하여 파라-파라 위치의 이미드 공중합체에서도 강한 흡습성을 보이고 있다. Polyamide-imide was prepared through copolymerization polyimide derivative and tertiary amine compound (1,4-diazabicyclo [2.2.2] octane) on modified silica nanoparticles with amide group and thermal and physical characteristics were investigated. Polymer compounds (PAAMP1, PABAMP1) were polymerized with monomer compounds (MP, AMP, PA, PAB) and DABCO and the imidization of polymer was confirmed through EA, FTIR, TGA, XPS, XRD and SEM. The Br(3d) of PAB was polymerized at 68.63 eV but one of PABAMP1 was not, which was found in XPS analysis. Since a tough imide group and siloxane segments of end-group of copolymers had influence on the solubility of solvents and the contact angle of NMP which is a polar solvent decreased from 85-88° to 63-65° owing to solvation. Strong hygroscopicity was found in the imide copolymer of para-para position.
민준호(Jun-Ho Min),이창헌(Chang-Hun Lee),유재광(Jae-Kwang Ryu),김효산(Hyo-San Kim) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
This research increases efficiency of track-maintenance repair and cuts maintenance cost with relocating Continuous Welded Rail how to set up install criteria by comprehension analysis through an on-the-spot survey and track measurement about installing place at expansion joint of Continuous Welded Rail. This scope of this research is 427 places installed at Line No.1~4 Seoulmetro. We take a field study and select two spots. So we survey wheel-load cross-load and railbed cross-resistance and suggest install criteria of expansion joint of Continuous Welded Rail through investigation and analysis of track facilities about neighboring section of expansion joint.
수직이착륙 무인항공기용 엇회전식 덕티드팬의 팁간극 영향에 대한 연구
민준호(Junho Min),류민형(Minhyoung Ryu),이세욱(Seawook Lee),조진수(Jinsoo Cho) 한국항공우주학회 2013 韓國航空宇宙學會誌 Vol.41 No.7
제자리 비행하는 수직이착륙 무인항공기용 엇회전식 덕티드팬의 전ㆍ후방동익 팁간극이 덕티드팬에 미치는 영향을 파악하기 위해 전산해석을 수행하였다. κ-ω SST 난류 모델을 사용하여 엇회전식 덕티드팬의 전산해석을 수행하였으며, 기준형상에 대해 제자리 및 전진 비행 상태의 공력특성을 풍동시험을 통해 계측하여 전산해석 기법을 검증하였다. 엇회전식 덕티드팬에서 특정 동익의 팁간극이 증가하면 그 동익과 덕트의 추력계수는 감소하고, 다른 동익의 추력계수는 증가하는 경향을 확인하였다. 후방동익의 팁간극이 증가하면 덕티드팬 출구면의 평균 전압을 상승시켜 덕티드팬의 추력을 증가시켰다. The tip clearance effect on counter-rotating ducted fan of VTOL UAV in hovering condition, was investigate using computational analysis. The κ-ωSST turbulence model is employed in this study. The numerical results of baseline model are validated by wind tunnel test in hovering and forward conditions. It is observed that if tip clearance of one rotor in the counter-rotating ducted fan increase then the thrust coefficient of another rotor increases. In Addition to this, when the tip clearance of the rear rotor increases, the thrust of the ducted fan is improved due to increasing of average total pressure at exit plane.
유재광(Jae-Kwang Ryu),민준호(Jun-Ho Min),김효산(Hyo-San Kim),이달재(Dal-Jae Lee) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Recently the number of passengers using urban railway has been increased by reasons of the reductions of car use due to high fuel prices and the enlightenment about the environment. Above all the noise and the vibration coming from the friction between the wheel and the rail of trains in operation which is not only a factor that hinders riding comforts but causes civil complaints. Furthermore the noise has become social issues from tightening the relevant regulations by the government since January 2010. Although ballasted tracks were constructed on urban railways at the time of opening they have been changed into slab tracks because slab tracks require much less maintenance. However in view of sound absorptivity of track slab tracks have 10 times less capability than ballasted tracks(ballasted track : 0.5~0.6 / slab tracks : 0.06) results more noise than that of ballasted tracks as much as 3dB(A) since slab tracks emit more reflection noise. Therefore in order to minimize reflection noise on slab tracks noise abatement system has been developed as a national R&D program to apply on-site test. It is assumed that the construction technology developed in this study can be used not only as basic data for the on-site test for the noise reduction in urban railway but as an efficient construction method.