• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.II
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• pp.919-921
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• 2005

We describe that an elastomeric stamp of poly(dimethylsiloxane) (PDMS) can modify the surface energy of some surfaces when brought into conformal contact with the number of stamping. We focus on an increase of the hydrophobicity of the patterned surface due to diffusion of low molecular weight (LMW) silicone polymer chains. The transfer of PDMS to the surface during patterning is relevant to and calls for attention by those who are using this method in applications where control of the surface chemistry is of importance for the application.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 2002년도 제35회 춘계학술대회
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• pp.291-295
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• 2002

O-ring seal is usual component part in various mechanical apparatus for sealing that makes efficient performance of the equipments. The sealing performance of O-ring is affected in environments of the O-rings, like that applied pressure, working temperature, pre-compressed ratio and materials. In this paper, a pressurized, compressed elastomeric bi-polymer O-ring inserted into a rectangular groove is analyzed numerically using the MARC finite element program. The calculated FEM results showed that bi-polymer O-ring that is manufactured by NBR for an inner and FFKM for an outer ring shows a low temperature distribution among various bi-polymer O-ring models. But, the normal contact stress between the flange and upper part of the O-ring is small compared to other bi-polymer model.

• 한국전기전자재료학회논문지
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• 제26권12호
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• pp.853-857
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• 2013

We design, develope and test a parallel active polymer pen lithography (PPL) device, which consists of individually addressable elastomeric probe tips. The PPL array chip is fabricated using soft lithography method with polydimethylsiloxane (PDMS) material. Individual probe can be pneumatically actuated via a computer controlled interface. We demonstrate parallel writing with 16 individually addressed pens, with each pen producing a different pattern in the same run. The largest proof-of-concept array fabricated is $4{\times}4$ with a spacing of $250{\mu}m$ in both x and y axes.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 2002년도 proceedings of the second asia international conference on tribology
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• pp.51-52
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• 2002

We report results on microtribological studies of chemically grafted nanoscale polymer layers of different architecture with thickness below 30 nm. We have fabricated the molecular lubrication coatings from elastomeric tri-block copolymers and tested two different designs of corresponding nanocomposite coatings. We observed a significant reduction of friction forces and an increase of the wear stability when a minute amount of oil was trapped within the grafted polymer layer. These polymer gel layers exhibited a very steady friction response and a small value of the coefficient of friction as compared to the initial polymer coating. A polymer 'triplex' coating has been formed by a multiple grafting technique. The unique design of this layer Includes a hard-soft-hard architecture with a compliant rubber interlayer mediating localized stresses transferred through the topmost hard layer. This architecture provides a non-linear mechanical response under a normal compression stress and allows additional dissipation of mechanical energy via the elastic rubber interlayer.

• Elastomers and Composites
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• 제38권2호
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• pp.175-179
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• 2003

For the total description of mechanical behaviors of elastomers, it is necessary to know the so-called rheological constitutive equation i.e. the strain-energy density function (W) in case of elastomers, which necessitates biaxial tensile results of elastic body. This paper first describes the experimental results of biaxial tensile measurements on poly(siloxane) model networks. W was estimated from its differential form i.e. the $1^{st}$ differential of W is stress. The W was found to reproduce the experimental stress-strain results, and the W estimated for silica filled poly(siloxane) networks suggest a different behavior between conventional precipitated silica and in situ formed silica. The difference suggests the different surface property of the two silicas.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 1996년도 추계 학술발표회
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• pp.465-467
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• 1996

A series of thermoplastic polyurethane copolymers were prepared from polypropyleneglycol(PPG, MW 3000), 1,4-butanediol, Isophorone diisocyanate(IPDI) and dibutyltin dilaurate(BBT) as catalyst. Studies have been made on the effects of molar ratio of isocyanate /polyol/chain extender on the properties such as tensile and thermal properties. By varying the ration of hard to soft segments, TPU ranging from soft elastomeric polymer to relatively hard elastoplastics and be obtained. The storage modulus and glass transition temperature of TPU increased with increasing the hard segment content.

• Elastomers and Composites
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• 제43권2호
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• pp.63-71
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• 2008

종래의 고무는 대부분 수송 수단인 타이어의 재료로 사용되어 왔으며, 타이어 산업이 곧 고무 산업이라는 인식이 깊다. 본 고에서는 고무를 포함하는 고분자 엘라스토머의 새로운 응용 분야를 조명하고자 한다. 외부의 자극에 반응하는 엘라스토머의 탄성력을 이용하는 액추에이터(actuator), 종이접기의 기술을 이용하여 프로그램된 엘라스토머 이차원 구조를 삼차원으로 변환 시키는 오리가미(origami), 그리고 리소그라피 기술을 이용하여 제조된 엘라스토머 마이크로 렌즈 등의 최신 연구 분야에서의 고분자 엘라스토머의 활용을 알아보고자 한다.

• Elastomers and Composites
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• 제34권3호
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• pp.247-252
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• 1999

보강 및 차수재인 지반용 고무재료를 열융착법에 의해 제조하였으며 환경공학분야에 적용을 위해 성능을 평가하였다. 이들 재료를 제조하는데 스펀본드 폴리에스테르 부직포, 유리섬유매트, 고강력 폴리에스테르사를 이용한 직포형 지오그리드를 기재로, SBS 함유 탄성 bitumen과 아스팔트를 보강재로 각각 사용하였다. 유리섬유 매트와 지오그리드를 기재로 사용한 지반용 재료의 경우 역학적성질이 우수하였으며, 부직포와 탄성 bitumen을 기재로한 경우에는 투수성이 우수하였다. 고무와 아스팔트를 혼합한 경우 연화점은 거의 변화가 없었으며, 고온에서의 치수안정성은 $120^{\circ}C$의 경우 두드러진 수축이 발생하지 않았다. 지반용 고무재료의 자외선에 대한 저항성은 가시적인 변화가 나타나지 않았다.

• Elastomers and Composites
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• 제56권1호
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• pp.6-11
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• 2021

In order to develop an ultra-high-density elastomeric material for substitution of steel dynamic dampers, a new curing system and technique for high-loading of the filler were examined in this study. Mechanochemical modification of chloroprene rubber (MAH-g-CR) using an internal mixer was carried out with maleic anhydride (MAH) as a reactive monomer. The optimum amount of MAH was 10 phr and the efficient grafting of MAH on CR could be achieved at a mixing temperature of 100℃. After preparing MAH-g-CR, 50 mol% epoxidized natural rubber (ENR 50) was blended with MAH-g-CR to develop a "self-curable rubber blend system" via reaction between the functional groups of the elastomeric matrices without the curing agent and additives. The content of ENR 50 was fixed at 30 wt.% throughout evaluation of the curing behavior of the MAH-g-CR/ENR blend. Tungsten powder was added to the MAH-g-CR/ENR matrix up to 60 vol.% to obtain ultra-high-density, and the maximum density obtained was 7.57 g/㎤. Stable ts2 (scorch time) and t90 (90% cure time) could be obtained even when tungsten powder was incorporated up to 60 vol.%. In addition, the tensile strength and damping properties of MAH-g-CR/ENR containing 60 vol.% of tungsten were better than those of CR containing 60 vol.% of tungsten.

• Elastomers and Composites
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• 제39권1호
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• pp.36-41
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• 2004

Poly(ethylene oxide)(PEO)와 epoxy diacrylate(EDA) 및 금속염인 LiClO_4$를 블렌드하고 자외선 가교시킴으로써 이온전도특성을 나타내는 고체 전해질을 제조하고, 제조된 전해질의 이온 전도도를 블렌드조성 염농도 및 온도 변화에 따가 측정하였다. PEO/EDA의 조성비가 70/30 wt%이고 ethylene $oxide/Li^+$의 몰비가 10인 전해질이 $25^{\circ}C$에서 $1.2{\times}10^{-5} S/cm$에 달하는 높은 이온전도도를 나타내었다. 제조된 전해질 필름은 투명하였으며 고무와 같은 탄성을 나타내었다. DSC, XRD 및 편광현미경을 이용한 모폴로지 분석으로부터 에폭시 사슬이 PEO의 결정화를 억제함으로써 완전히 무정형인 블렌드를 제조할 수 있음을 확인할 수 있었다.