• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 추계학술대회 논문집 Vol.19
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• pp.164-165
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• 2006

Carbon nanotube(CNT)-reinforced poly(ethylene-co-ethyl acrylate)(EEA) nanocomposites were prepared by melt mixing with a Haake internal mixer. The CNT loading was vaned from 0 to 20 wt%. The changes m CNT dispersion and shape were investigated with FE-SEM observation with and without the Tensile strain of 40%. The CNT was protruded over the fracture surface upon Tensile strain, which is a very interesting behavior.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2004년도 하계학술대회 논문집 Vol.5 No.2
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• pp.1121-1124
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• 2004

Aging test to estimate life property of polymer insulator is executed through several international standard such as IEC 61109 and CEA tracking wheel test, but is not getting clear conclusion yet. There are two methods in the diagnosis method of polymer insulator such as off-line and on-line. The diagnosis methods in off-line are external condition analysis by the eye, contaminant analysis on surface, surface analysis, pollution withstand voltage test, power frequency flashover voltage test, lightning impulse flashover test, tensile fracture load test and flexural load test. The diagnosis methods in off-line most are the method for virgin and last aged sample. However, the diagnosis method in on-line is method that can be evaluate sample state as progressing continuously aging test in beginning, The diagnosis method in on-line is arranged as following: leakage current measurement, electric field, surface state investigation, thermal image, emitting light measurement and then so. In this paper, the tracking performance of polymer insulator with salt solution which is added surface active agent. The diagnosis of insulator sample has been analyzed by leakage current and visual examination.

• Food Science and Biotechnology
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• 제18권4호
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• pp.910-916
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• 2009

Present work was focused on the influence of methylcellulose (MC) on steady rheology of wheat gliadin solution and the properties of glycerol plasticized gliadin films. The presence of MC below 0.99 wt% improved viscosity and flow activation energy of the 10 wt% gliadin solution significantly. In the casting films containing 0.2 g glycerol/g dry protein, the MC component aggregated in the gliadin matrix. The blend films containing less than 7.7 wt% MC exhibited higher Young's modulus (E) and tensile strength (${\sigma}_b$) and lower elongation at break (${\epsilon}_b$) in comparison with the pure gliadin film, which was related to the intermolecular interaction between MC and gliadins, the brittle fracture of the aggregated MC component, and the increase in glass transition temperature ($T_g$) of the gliadin phase. Increasing MC content led to a slight increase in water vapor permeability (WVP) without significant influence on the moisture absorption (MA).

• 한국농공학회:학술대회논문집
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• 한국농공학회 2001년도 학술발표회 발표논문집
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• pp.176-180
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• 2001

Steel fiber and polymer are used widely for reinforcement material of RC structures because of its excellences of the durability, serviceability as well as mechanical properties. The purpose of this study is investigate the shear behavior of high concrete beams input polymer-steel fibrous. The static test was carried out to measure the ultimate load, the initial load of flexural and diagonal cracking, crack patterns and fracture modes. Also, load-strain and load-deflection examined, during the test cracks are sketched the load values according to grow of crack.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2004년도 추계학술발표대회 논문집
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• pp.88-91
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• 2004

In this study, a number of natural fiber henequen reinforced polymer matrix composites were successfully fabricated by means of a compression molding technique using chopped henequen fibers surface-treated with different electron beam irradiation (EBI) dosages, thermoplastic poly(butylene succinate), thermosetting unsaturated polyester and phenolic resins. Their interfacial and thermal characteristics were studied in terms of interfacial shear strength, fracture surface, dynamic mechanical properties, dimensional stability, and thermal stability using single fiber microbonding test, SEM, DMA, TMA, and TGA. The results show that their interfacial and thermal properties significantly depend on the intensity of EBl treatment on the natural fiber surface.

• Elastomers and Composites
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• 제18권4호
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• pp.135-139
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• 1983

Scanning electron microscopy studies were conducted to examine the surface treatment effects of treating agents the proposed in the previous studies on various vulcanizates. Fracture surfaces of the vulcanizates compounded with kaolin treated with sodium polyphosphate of poly(maleic anhydride) presented favorable results as expected from the results of the previous studies. In other words, treating agents such as sodium polyphosphate and poly(maleic anhydride) show considerable reinforcing effects on the vulcanizates.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 C
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• pp.2025-2027
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• 2005

Thermal conductive polymer film was adopted to reduce the fracture of module during the fabrication of thermoelectric generator. We investigated the thermoelectric output power of module with the change of thickness of polymer film, direct contact and thermal-conductive grease. It is measured that thermoelectric output power is decreased with the increasing thickness of thermal-conductive polymer film. And

• 공업화학
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• 제1권2호
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• pp.124-132
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• 1990

최근 개발된 사관능성 에폭시 수지인 EPON HPT 1071과 diaminodiphenyl sulfone (DDS) 경화제를 이용하여, 이 HPT 1071/DDS계의 기계적 성질을 개선할 목적으로 열가소성 고분자인 Poly(aryl etherimide) (PEI)를 도입하여 그 영향을 고찰하였다. HPT 1071/DDS계의 경우, 에폭시/DDS계의 농도를 각각 0.54, 0.71, 1.0으로 달리한 조성들의 강인성과 굴곡강도는 큰 변화가 없었다. HPT 1071/DDS/PEI 계에서는 PEI 농도가 증가할수록 에폭시 경화물의 강인성 및 굴곡강도는 증가하였으며, 수지와 PEI의 상용성으로 인하여 심한 상분리가 관찰되지 않았다. 경화된 에폭시 수지의 기계적 물성과 형태학에 대한 상관관계도 함께 고찰하였다.

• 콘크리트학회논문집
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• 제15권5호
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• pp.739-746
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• 2003

Various researches on the application of polymer dispersions to the cement mortar and concrete have been carried out in many countries like America, Japan and Germany and so on due to their high performance and good modification effect. PAE of polymer dispersion widely used in situ was employed that the high flowability may be induced in the cement mortar. In order to investigate the modification of cement mortar with high flowability by PAE and fracture mode of adhesive strength properties in tension of that, experimental parameters were set as PAE solid-cement ratio(P/C) and cement: fine aggregate(C:F) and the experiments such as unit weight, flow, consistency change, crack resistance and segregation that inform on the general properties have been done. Adhesion in tension is measured with a view to comprehending the properties and fracture mode in tensile load. Consistency change of cement mortar modified by PAE did grow better as the ratio of PAE solid-cement increased and was much superior to that of resin based flooring such as polyurethane and epoxy which recorded the loss of consistency in 90 min. after mixing. Adhesive strength in tension increased with continuity during curing period and showed the maximum in case of C:F=1:1 and P/C=20%.

• 한국재료학회지
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• 제4권8호
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• pp.888-894
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• 1994

bismaleimide취약성을 개선 하기 위하여 toughening agent인 TM120을 첨가하여 carbon/$(\pm 45^\circ)_{2s}$를 제조하고 이들의 파손과 기계적 특성을 인당실험과 음향방출을 통해 자세히 논하였다. 첨가하는 TM120의 비율은 0, 5, 10, 15, 20, 25phr이었고, 1, 4-diazobicyclo-(2, 2, 2)-octane(DABCO) 0.2phr를 경화 촉진제로 사용하였다. 또한, 탄소 섬유는 Toray사의 T300를 사용하였고, 음향방출과 인장실험 결과로 TM120이 적당한 첨가량은 20phr이었으며, TM120은 cabon/$(\pm 45^\circ)_{2s}$의 파손특성과 기계적물성에 많은 영향을 미쳤다.