• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.9 no.2
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• pp.81-86
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• 2011

Polymer-modified cement is the composite material made by partially replacing and strengthening the cement hydrate binders of conventional mortar with polymeric modifiers such as polymer latexes and redispersible polymeric modifiers. It is known that the addition of polymer to cement mortar leads to improved quality, which would be expected to have a high chemical resistance. Therefore, the purpose of this study is to identify the improved chemical resistance, such as low permeability and low ion diffusivity, of the polymer-modified cement as a solidification agent for the radwaste. First, polymer-modified cement specimens by latex modification were prepared according to the polymer content from 0% to 30% to select the optimized polymer content. At those specimens, the water-to-cement (W/C) ratio was maintained to 33% and 50% respectively. After the much curing time, the structural integrity of specimens was evaluated through the compressive strength test and the porosity evaluation by the water immersion method. From the results, 10% of the polymer content at 33% of the W/C ratio was shown to have the most improved quality. Finally, the leaching test referredfrom ANS 16.1 for the specimens having the most improved quality was conducted. Dedicated specimens for the leaching test were then mixed with radioisotopes of $^{60}Co$ and $^{137}Cs$ at the specimen preparation.

• Proceedings of the Korean Magnestics Society Conference
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• 2006.06a
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• pp.152-153
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• 2006

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2002.11a
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• pp.29-33
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• 2002

산업의 고도화에 따라 반도체를 비롯한 전자산업의 발전과 더불어 전자파의 인체 유해성에 대한 EMI 규제가 더욱 강화되고 있으며 반도체 소자나 정밀기기의 ESD 기술이 요구되고 있다. 따라서 전기전도성 고분자는 유해전자파의 차폐나 정전기 방지를 위한 특수용도의 소재로 각광받고 있으며 그 수요가 급증하고 있다.(중략)

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2006.04a
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• pp.107-108
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• 2006

• Proceedings of the Korean Fiber Society Conference
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• 1998.04a
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• pp.350-353
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• 1998

최근 폴리에스테르(PET) 섬유는 각각의 분야에서 다양한 용도로 그에 적당한 섬도를 가진 것이 사용되며, 특히 극세섬도 PET 섬유의 제조시 폴리머의 개질, 방사, 연사, 제직, 염색가공 등 각각의 분야의 기술을 복합함에 따라 신감성, 고부가가치를 부여하는 신합섬이 등장하여 최근 수년간 차별화 상품으로서 이용되어 왔다.(중략)

• 한국전기화학회:학술대회논문집
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• 2001.04a
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• pp.41-41
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• 2001

• Electrical & Electronic Materials
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• v.23 no.9
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• pp.12-19
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• 2010

• Journal of the Korean Magnetics Society
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• v.20 no.4
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• pp.143-148
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• 2010

This study examined the effects of sheet thickness on electromagnetic wave absorption characteristics and internal microstructure in 92.6%Fe-6.5%Si-0.9%Cr (wt%) alloy flakes/polymer composite sheets available for quasi-microwave band. The composite sheets with the thickness of 0.3, 0.4 and 0.5 mm were prepared by tape casting. A significant decrease in transmission parameter $S_{21}$ and a large increase in power loss were observed for the thick composite sheet in the frequency range of 1~5 GHz. However the permeability properties were not affected by thickness variation, while the imaginary part of complex permittivity increased with the increase of sheet thickness at 1~5 GHz. The enhanced electromagnetic wave absorption characteristics in the thicker composite sheets was attributed to the changed microstructure and the higher dielectric loss.

• Journal of Korean Society of Steel Construction
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• v.12 no.6
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• pp.749-758
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• 2000

This study presents a governing equations of bending behavior of sandwich plates with thick metal, polymer composite facings. Based on zig-zag models for through thickness deformations, the transverse shear deformation of composite facings is included. All edges of plate are assumed to be simply supported. Results of the bending analysis under lateral loads are presented for the influence of various lay up sequences of antisymmetric angle-ply laminated facings. The accuracy of the approach is ascertained by comparing solutions from the sandwich plates theory with composite facings to the laminated plates theory. Since the present analysis considers the bending stiffness of the core and also the transverse shear deformations of the laminated facings, the proposed method showed higher than that calculated according to the general laminated plates theory. The information presented might be useful to design sandwich plates structure with metal, polymer matrix composite facings.

• Proceedings of the Korea Concrete Institute Conference
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• 2009.05a
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• pp.469-470
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• 2009

Recently, so that HSC can secure the fire resistance properties at the time of a fire in super tall building suggested method of combined fiber. Thus, there is the purpose to develop the high fireproof concrete which applied method of combined fiber which can satisfy flowability and the fire resistance properties of HSC for construction of the super tall building.