http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
공단량체의 조성과 함량이 폴리아크릴로니트릴계 탄소섬유 전구체의 중합 및 열적 거동에 미치는 영향
노지영(Ji-Young Noh),국윤수(Yun-Su Kuk),김태은(Tae-Eun Kim),김성룡(Sung-Ryong Kim),김기영(Ki-Young Kim),임정혁(Jung-Hyurk Lim),김경민(Kyung-Min Kim) 한국고분자학회 2021 폴리머 Vol.45 No.5
탄소섬유 전구체로 폴리아크릴로나이트릴(PAN)계 중합체를 공단량체로 중성계 모노머인 methyl acrylate와 산성계 모노머인 itaconic acid 또는 acrylic acid를 사용하여 서로 다른 조성과 함량으로 용액중합을 통하여 높은 수율로 제조하였다. PAN 중합체의 화학구조, 고유점도 및 분자량은 핵자기 공명 분광기(<SUP>1</SUP>H NMR), 우벨로오드 점도계로 확인하였고, 퓨리에 변환 적외선 분광기(FTIR) 분석 및 고리화 반응지수를 통하여 열처리 온도에 따른 열산화 안정화 과정에서 일어나는 고리화 반응과 탈수소화 반응에 의한 PAN 중합체의 구조변화와 공단량체의 함량과 조성이 고리화 반응에 미치는 영향을 관찰하였고, 열산화 안정화 과정에서 PAN 중합체의 고리화 개시온도 및 개시효율과 탄소 잔존량은 시차 주사 열량계(DSC)와 열 중량 분석기(TGA)를 통해 확인하였다. Polyacrylonitrile (PAN) co- or terpolymers as carbon fiber precursor were successfully synthesized with high yield using methyl acrylate (MA), itaconic acid (IA) or acrylic acid (AA) as comonomers via conventional solution polymerization according to the different composition and weight ratio. The chemical structure, intrinsic viscosity, viscosity average molecular weight of PAN polymers were determined by proton nuclear magnetic resonance (<SUP>1</SUP>H NMR) and ubbelohde viscometer. The structure change of PAN polymers derived from cyclization and dehydrogenation reaction during thermal oxidative stabilization depending on the different thermal treatment temperature was characterized by Fourier transform infrared spectroscopy (FTIR) and the cyclization reaction index was used to check out the effect of comonomer composition and weight ratio on the cyclization reaction of PAN polymers. The initial cyclization temperature, efficiency of cyclization reaction, and char yield of PAN polymers were analyzed by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA).
폴리아크릴로니트릴 기반 3D 탄소나노섬유 스펀지의 제조 및 오일 흡착 특성
주혜원,강진혁,박종호,고재경,국윤수,남창우,김병석,Hye-Won Ju,Jin-Hyeok Kang,Jong-Ho Park,Jae-Kyoung Ko,Yun-Su Kuk,Changwoo Nam,Byoung-Suhk Kim 한국복합재료학회 2023 Composites research Vol.36 No.3
In this work, the preparation and its oil adsorption behavior of polyacrylonitrile-based carbon nanofiber sponge were investigated. The prepared carbon sponges showed excellent selective oil adsorption in the mixture of water and oil, and the adsorption capacity of reused carbon nanofiber sponge was also investigated. Further, carbon nanofiber sponge adsorbent with internally structured channel showed fast oil adsorption behavior due to a capillary phenomenon. After use, sponge adsorbent was heat-treated at 800℃ under N<sup>2</sup> and studied the possibility of a sensor for electrochemical detection of 4-aminophenol.
아민 기능화된 탄소나노튜브의 분산상태 및 표면자유 에너지 변화가 탄소나노튜브/탄소섬유강화 복합소재의 기계적 특성에 미치는 영향
최웅기,박길영,신홍석,국윤수,김병석,서민강,Choi, Woong-Ki,Park, Gil-Young,Shin, Hong-Suk,Kuk, Yun-Su,Kim, Byung-Shuk,Seo, Min-Kang 한국섬유공학회 2017 한국섬유공학회지 Vol.54 No.3
In this work, the effects of the dispersive condition and surface energy change of multi-walled carbon nanotube (MWCNT) on the mechanical properties of amino-functionalized MWCNT containing carbon fibers-reinforced epoxy composites were studied. Amino-functionalization of MWCNT was carried out by grafting spermidine and p-phenylenediamine onto the surfaces of MWCNT through amidation. The surface properties of the MWCNT before and after amidation were observed using scanning electron microscope (SEM), Fourier transform infrared (FT-IR), X-ray photoelectron spectroscope (XPS), microscope, and contact angle measurements. Theoretical interfacial adhesions between the MWCNT and the epoxy resins were studied by calculating the work of adhesion and demonstrated by interlaminar shear strength (ILSS). From the experimental results, it was found that amino-functionalized MWCNT showed quite a homogeneous dispersion state in epoxy matrix resins. Additionally, the interfacial adhesions could be improved by amino-functionalizing MWCNTs surfaces. Consequently, the introduction of an amino-functional group on MWCNT surfaces positively affected the dispersibility of MWCNT, which resulted in improving the mechanical properties of the carbon fibers-reinforced epoxy composites.
석유계 피치가 첨가된 고온 탄소복합재용 페놀수지의 열 유변학적 거동 연구
양재연 ( Jae-yeon Yang ),국윤수 ( Yun-su Kuk ),서민강 ( Min-kang Seo ),김병석 ( Byoung-suhk Kim ) 한국복합재료학회 2020 Composites research Vol.33 No.6
본 연구에서는 각각에 다른 연화점을 갖는 석유계 피치의 열 유변학적 특성을 연구하였으며, 이를 함침용 페놀수지에 석유계 피치를 첨가하여 B-stage 형태의 페놀수지/석유계 피치 혼합물을 제조하였다. 그 결과, 연화점이 다른 석유계 피치는 QI의 함량이 증가할수록 피치의 유동성이 감소하였고, 고체의 점탄성 특성을 나타내었다. 또한, 다른 연화점을 갖는 석유계 피치를 페놀수지에 첨가함으로써, 페놀수지의 경화거동과 열 유변학적 특성에 미치는 영향에 대해 고찰하였을 때, 다른 연화점의 석유계 피치를 첨가함에 따라 페놀수지의 경화속도 및 경화거동을 조절할 수 있었으며, 이 중 P-Pitch 2가 첨가된 페놀수지 혼합물의 경우 동일한 경화 온도조건에서 다른 혼합물에 비해 유동성이 높은 것을 확인할 수 있었다. In this study, the thermo-rheological behaivors of petroleum pitches with different softening points were studied, and a B-stage phenolic resins/petroleum pitches blends were prepared by adding petroleum pitches to the phenolic resins. As a result, the petroleum pitch with different softening points decreased the fluidity of the petroleum pitch as the Quinoline insoluble (QI) content increased and showed the viscous properties of the solid. In addition, the effect of adding petroleum pitches having different softening points on the thermo-rheological properties of phenolic resins was investigated. When petroleum pitch with a high softening point was added, the fluidity of the phenolic resin was reduced, and the hardening behavior was fast. It was possible to control the curing rate and curing behavior of the phenolic resin by adding petroleum pitches of different softening points. Among them, the phenolic resin mixture to which P-Pitch 2 was added has a higher fluidity than other blends under the same curing temperature condition.
최보경 ( Bo Kyung Choi ),최웅기 ( Woong Ki Choi ),국윤수 ( Yun Su Kuk ),김홍건 ( Hong Gun Kim ),서민강 ( Min Kang Seo ) 한국공업화학회 2014 공업화학 Vol.25 No.5
In this paper, the thermal behaviors of expanded graphite(EG)/erythritol composites with different contents of EG were studied. The surface and structure properties of the composites were determined by using scanning electron microscope(SEM), transmission electron microscope (TEM), and X-ray diffraction (XRD), respectively. The thermal properties were investigated by differential scanning calorimetry (DSC) and thermal conductivity (TC). As experimental results, the thermal conductivityof the composites increased with increasing the EG content. However, the latent heat was somewhat decreased in the presence of EG. We could concluded that EG was highly promising materials for improving the heat transfer enhancement and energy storage capacity of phase change materials (PCMs).
시간 및 온도변화에 따른 폴리아크릴로니트릴/디메틸술폭시드 중합체 용액의 유변학적 특성 연구
양재연 ( Jae-yeon Yang ),이병민 ( Byoung-min Lee ),국윤수 ( Yun-su Kuk ),김병석 ( Byoung-suhk Kim ),서민강 ( Min-kang Seo ) 한국복합재료학회 2019 Composites research Vol.32 No.1
본 연구에서는 PAN 섬유용 폴리아크릴로니트릴(PAN)/디메틸술폭시드(DMSO) 용액의 보관시간 및 온도 변화에 따른 구조적 및 유변학적 특성에 대해 고찰하였다. 결과로서, 모든 PAN/DMSO 용액은 온도 변화에 따라 매우 특징적인 유변학적 거동을 보였다. 중합체 용액은 온도가 40~70oC의 온도 범위까지 증가함에 따라 복합 점도가 증가하고 손실 계수(tanδ)가 감소함을 나타내었으며, 낮은 진동수에서 점도가 급격히 증가하는 것을 확인할 수 있었다. 이러한 결과는 저장 시간에 따라 중합체 용액내 물에 의한 분자간 수소 결합으로 겔 고분자 및 고밀도 겔 구조가 형성되었기 때문으로 판단된다. In this study, the structural and rheological characterizations of polyacrylonitrile(PAN)/dimethyl sulfoxide(DMSO) solutions for PAN fiber were investigated according to the change of storage times and temperatures. As a result, PAN/DMSO solutions exhibited a very characteristic rheological behavior with variation of temperature. The solutions showed an increase of complex viscosity and a decrease of loss tangent(tanδ) as temperature was increased over the temperature range of 40 and 70oC and it could be seen that the viscosity rapidly increased at low frequency. These results indicated that the gel polymer and denser gel structure were formed due to the intermolecular hydrogen bonding of water in the polymer solution depending on the storage time.