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곽성복(Sung Bok Kwak),김재옥(Jae Ok Kim),이동기(Dong Gi Lee),주상률(Sang Ryool Ju),김준형(Joon Hyung Kim),고재송(Jae Song Koh),강보성(Bo Sung Kang),정선경(Sun Kyung Jeoung),유승을(Seung Eul Yoo),남재도(Jae Do Nam) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, the trend of automotive interior parts is focused on improvement of light weight materials. Thermoplastic foams are materials that are composed of a cellular core structure created by the expansion of blowing agents of volatile gases or liquids, which can be economically used in insulating, packaging, and automobile industries. Thermoplastic olefins (TPO) are currently evaluated as a potential replacement of PVC or ABS blends in automotive interior skins such as Door Trim (DT) and Instrument Panel (IP) skins. In this study, micro cellular foaming materials applied automotive instrument panel was investigated.
다층구조 압출 발포 자동차 대형 내장 부품 개발에 관한 연구
곽성복(Sung Bok Kwak),이동기(Dong Gi Lee),주상률(Sang Ryool Ju),조창현(Chang Hyun Cho),김준형(Joon Hyung Kim),고재송(Jae Song Koh),강보성(Bo Sung Kang),정선경(Sung Kyung Jeoung),유승을(Seung Eul Yoo),남재도(Jae Do Nam) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Thermoplastic foams are materials that are composed of a cellular core structure created by the expansion of a blowing agents of volatile gases or liquids, which can be economically used in insulating, packaging, and automobile industries. It due to the optimized properties of stiffness, strength, and energy absorption. Thermoplastic olefins(TPO) are currently evaluated as a potential replacement of PVC or ABS blends in automotive interior skins such as Door Trim(DT) and Instrument Panel(IP) skins. Some of the advantages of TPO over PVC or ABS skins are improved UV and heat aging, reduced fogging due to absence of plasticizer exudation, and recyclability. In this study, the nucleation and volume expansion behaviors of ethylene-octene copolymer were investigated at when different types of PP with different Melting Index(MI) values were incorporated in the foaming process. The effects of polypropylene and its melt flow characteristics on the cell density, final expansion ratio, and foam morphology were examined.
EL소재 적용 발광효과 발휘하는 Instrument Panel 개발에 관한 연구
곽성복(Sung Bok Kwak),이신식(Shin Sik Lee),정선경(Sung Kyung Jeoung),황태선(Tae Sun Hwang),남재도(Jae Do Nam) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In the field of automobile interior industry, the coloring and lightening of the instrument panel(I/P) has been focused on for the purposed of value added styling and upgrading. In this application, the powder type electroluminescence(EL) system has a great possibility to be applied in the integrated instrument panel. The EL film is composed of the inorganic phosphor and dielectric layer printed on the top of Indium Tin Oxide(ITO) and Silver paste layer. Thus EL film was made of a printed on silk screen method. Thermoplastic olefins(TPO) sheet was developed to satisfy the applied for EL back lighting system. And I/P skin was developed to satisfy the required mechanical properties and reliability. I/P Polyurethane(PU) foaming was developed to satisfy the applied for EL film. The mechanical and processing properties of materials to satisfy the required of I/P assembly at reliability. In this study, automobile interior was developed the first time applied the EL back lighting system for instrument panel.
하진욱(Jin Uk Ha),정선경(Sun Kyung Jeoung),이평찬(Pyoung-Chan Lee),황예진(Ye Jin Hwang),남병국(Byung Kook Nam),한인수(In-Soo Han),곽성복(Sung Bok Kwak),이재용(Jae Yong Lee) 한국고분자학회 2015 폴리머 Vol.39 No.1
열팽창 캡슐은 코어에 위치한 발포가스가 기화온도 이상이 될 경우 캡슐을 팽창시켜 상온상태보다 큰 부피를 지닌 형태를 이루게 되는데 이러한 특성을 이용하여 플라스틱의 발포소재로 적용이 가능하다. 본 연구에서는 자동차 내외장재 용도로 가장 많이 사용되는 폴리프로필렌(polypropylene, PP)을 베이스 원료로 하여 기존 화학발포제와 열팽창 캡슐을 이용하여 PP 폼을 제조하였으며, 제조된 시편의 물리적인 특성을 비교하였다. 화학 발포제와 열팽창 캡슐을 적용하여 제조된 PP 폼은 모두 첨가된 발포제 및 열팽창 캡슐 함량 증가에 따라 시편의 밀도가 감소하였고, 인장강도를 포함한 기계적 물성 또한 감소하였다. 하지만, 열팽창 캡슐을 이용해 제조된 PP 폼의 경우는 화학 발포제를 적용하여 만들어진 시편대비 충격강도 감소량이 크지 않았다. 발포제 종류별로 상이한 물리적 특성을 분석하기 위하여 PP 폼의 매트릭스를 분석하였으며, 다른 형상의 모폴로지를 관찰하였다. Thermally expandable microcapsules (TEMs) can be expanded upon heating since the activation energy of liquid hydrocarbon at the core of the TEMs increased at high temperature. Due to this property, TEMs are widely used in the industry as blowing agents or light-weight fillers. In this article, chemical blowing agent and TEM were used for making polypropylene (PP) foams, and their mechanical properties were compared. Physical properties (tensile strength, impact strength etc.) of PP foams decreased with increasing the amount of blowing agents while weight of specimen decreased. However, PP foam produced with TEMs showed higher impact strength than the one with a chemical blowing agent. In order to figure out the difference of impact strength, the morphology of PP foamed was investigated. Expanding properties of TEM can be controlled by changing core back distance.
실리카-그라파이트 이원 충진제를 이용한 SBR 컴파운드의 성질
신지항 ( Ji Hang Shin ),( A M Shanmugharaj ),이평찬 ( Pyoung Chan Lee ),정선경 ( Sun Kyung Jeoung ),류승훈 ( Sung Hun Ryu ) 한국고무학회 2014 엘라스토머 및 콤포지트 Vol.49 No.1
실리카 입자에 팽창흑연을 그라프트 시킴으로 카본코팅을 실시하였으며, 이를 확인하기 위하여 FT-IR, TGA, XPS 그리고 TEM 분석을 실시하였다. 코팅된 흑연의 결정특성은 XRD를 이용하여 확인하였으며, 카본 코팅된 실리카가 SBR 컴파운드의 유변학적 그리고 기계적 성질에 미치는 영향에 대하여 살펴보았다. 카본 코팅된 실리카를 이용한 경우 순수 실리카를 이용한 경우에 비하여 SBR 컴파운드의 유변학적 그리고 기계적 성질이 크게 향상됨을 알 수 있었다. 이러한 현상은 평형팽창비율과 bound 고무 양 변화로도 확인 할 수 있었다. Carbon coating on silica particles is done by grafting expanded graphite on the silica aggregates. Successful coating of carbon is corroborated using FT-IR, TGA, XPS and TEM. Crystalline nature of coated graphite is corroborated using XRD. Influence of carbon coated silica particles on rheometric and mechanical properties of SBR composites are investigated. Carbon coated silica particles showed significant improvement in rheometric and mechanical properties, when compared to pristine silica filled system corroborating higher polymer-filler adhesion. This fact was further supported by bound rubber content and equilibrium swelling ratios of unvulcanized and vulcanized SBR composites.