• Title, Summary, Keyword: polymer modifier

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Physical Properties of Medical Radiation Shielding Sheet According to Shielding Materials Fusion and Resin Modifier Properties (차폐 재료의 융합과 개질제 특성에 따른 의료방사선 차폐 시트 물리적 특성 고찰)

  • Kim, Seon-Chil
    • Journal of the Korea Convergence Society
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    • v.9 no.12
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    • pp.99-106
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    • 2018
  • The modifier proposed in this research is for enhancing the affinity of the glass component with the high polymer resin and the molecular weight. The particle packing, tensile strength and shielding performance of the shielding sheet made of the tungsten oxide were evaluated. The best effect can be obtained when 20% of the modifier PMMA used to improve the shielding performance and maintain the affinity and strength with the sealant is mixed. The fusion of the materials presented in this study and the mass production of the shielding sheet through the modifier are possible and will contribute to the production of lightweight shielding sheets in the future.

Properties of Polymer Cement Mortar Based on Styrene-Butyl Acrylate according to Emulsifier and Monomer Ratios (유화제 및 단량체비에 따른 스티렌-부틸 아크릴레이트계 폴리머 시멘트 모르타르의 특성)

  • Jo, Youngkug;Hyung, Wongil
    • Polymer Korea
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    • v.37 no.2
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    • pp.148-155
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    • 2013
  • The purpose of this study is to clarify the effect of the emulsifier ratio on the properties of the polymer cement mortars based on styrene-butyl acrylate (S/BA) latexes, and to obtain necessary basic data to develop appropriate latexes for cement modifiers. The polymer dispersions for cement modifiers was synthesized using styrene and butyl acrylate. Polymer cement mortars based on S/BA latexes were prepared with various monomer and emulsifier ratios, and their water-cement ratio, air content, flexural and compressive strengths, water absorption and chloride ion penetration were tested. From the test results, the maximum flexural and compressive strengths of polymer cement mortars based on S/BA latexes were obtained at a bound styrene content of 60% and an emulsifier ratio of 6%. Also, the water absorption and chloride ion penetration depth are greatly affected by the polymer-cement ratio rather than the bound styrene and emulsifier content. Accordingly, it is judged that S/BA latexes can be used place of the conventional polymer dispersions of cement modifier.

Morphology and Impact Strength of High Density Polyethylene/Polyamide Alloy (HDPE/PA 알로이의 모포로지와 충격강도)

  • Lee, Yong-Moo;Kang, Doo-Whan
    • Elastomers and Composites
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    • v.28 no.4
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    • pp.283-292
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    • 1993
  • The morphology and impact strength of alloys of high density polyethylene(HDPE) and nylon-6(PA) with modified $ethylene-{\alpha}-olefin$ copolymer(OCP) as compatibilizer and impact modifier were measured by the scanning electron microscope(SEM) and the notched Izod impact test(and the high rate impact test), respectively. HDPE is incompatible with PA and specimens obtained from simple mechanical mixing show the inferior properties. However, it was indicated that OCP played roles of not only impact modifier but also compatibilizer. High rate impact test results were different from those of the notched Izod impact test, but in both tests OCP was effective for HDPE/PA blends. From SEM observation, the size of the dispersed phase in alloys prepared with OCP is much smaller than that of alloys without OCP and the interfacial adhesion of alloys prepared with OCP is also better. Toughening mechanism of polymer blends was discussed by combining the morphology analysis with mechanical and thermal properties.

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Performance of Geogrids for Retarding Reflection Crack of Asphalt Overlay Pavement (아스팔트 덧씌우기의 반사균열 지연을 위한 지오그리드의 적용성 연구)

  • Kim, Kwang-Woo;Doh, Young-Soo;Kim, Bun-Chang;Lee, Moon-Sup
    • International Journal of Highway Engineering
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    • v.7 no.2
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    • pp.1-12
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    • 2005
  • This study was conducted to evaluate effect of geogrid and fabric, which are used underneath the overlaid asphalt pavement for retarding reflection cracking by simulated laboratory test. In this study, an interlayer at the interface between old concrete pavement surface and overlaid asphalt mixture, and polymer-modifier were used as an effort of retarding reflection crack initiation and for strengthening mixture. Five products were used in preparation of asphalt concrete beam specimen which was tack coated on top of jointed concrete block. Simulated Mode I and II fracture test were conducted under wheel loading and results were compared among those products. From the test results, several material and reinforcement combinations were observed to have a significant retardation effect against reflection cracking. The most effectively strengthened pavement against reflection cracking was found to be the LDPE-modifier asphalt mixture with a grid reinforcement at the bottom.

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Laboratory Evaluation of the Properties of Sulfur Modified Asphalt Mixtures (황이 첨가된 개질 아스팔트 혼합물의 실내 물성 평가)

  • Yang Sung-Lin;Kim Boo-Il;Kim Nam-Ho;Rhee Suk-Keun
    • International Journal of Highway Engineering
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    • v.8 no.3
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    • pp.163-172
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    • 2006
  • This study evaluated the laboratory properties of asphalt binder and mixture modified with SPC(Sulfur Polymer Cement), which consists of sulfur as a main ingredient that is an industrial by-product made from refining process of crude oil and carbon-black as an additive. Four levels of SPC modifier ratios(0, 10, 30, 50%) were evaluated in the laboratory. Superpave(Superior Performing Asphalt Pavements) system was used to determine the PG(Performance Grade) and evaluate the property of SPC modified binder at the different temperatures. IDT(Indirect Tensile Test) was performed to evaluate the resistance of fatigue and low-temperature cracking at $10^{\circ}C\;and\;-10^{\circ}C$. Wheel-tracking test was also performed to evaluate the rutting-resistance of SPC modified asphalt mixtures. Test results showed that the more SPC modifier ratios, the better rutting-resistance and the more potential of low-temperature cracking resistance. However, SPC modifier did not show the effect on the fatigue cracking resistance.

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Polyethylene terephthalate (PET) Nanocomposites filled with Fumed Silicas by Melt Compounding (Fumed silica가 충진된 Polyethylene terephthalate(PET) Nano복합재의 연구)

  • Hahm, Wan-Gyu;Im, Seung-Soon
    • Proceedings of the Korean Fiber Society Conference
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    • pp.309-312
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    • 2002
  • The polymer nanocomposites are attracting considerable attention on account of the characteristic properties of nanoparticles have extremely large surface area per a unit mass. Recentry, mica-type silicates like montmorillonite have received a good deal of attention as effective nano-reinforcemen(1), but actually some critical problems such as the difficulties of exfoliation and surface modification, the weak heat-resistance of modifier, and inferior processability due to the increase in melt viscosity have restricted the mass production and various applications of the nanocoposite. (omitted)

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Physical Properties of Polymer-Modified Mortars Using Waste Concrete Fine Aggregate (재생잔골재를 사용한 폴리머 시멘트 모르타르의 물성)

  • Hwang, Eui-Hwan;Choi, Jae-Jin;Kim, Jin-Man
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.793-797
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    • 2005
  • This study was undertaken to examine the feasibility of recycling waste concrete fine aggregate to prepare polymer-modified mortars. The specimens of polymer-modified mortars were prepared by using styrene-butadiene rubber(SBR) latex and polyacrylic ester(PAE) emulsion as a polymer modifier. The formulations for specimens were prepared with various replacing ratios of waste concrete fine aggregates as parts of standard sand and various polymer cement ratios. For the evaluation of the performance of polymer-modified mortars, various physical properties were investigated. As a results, water cement ratio of polymer-modified fresh mortars increased with an increase of recycled fine aggregate, but decreased with an increase of polymer modifiers. The compressive and flexural strengths of polymer-modified mortars decreased with an increase of recycled fine aggregate, but flexural strengths increased with an increase of polymer modifiers.

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A Study on the Lining of Reinforced Concrete Pipe Using Polymer-Modified Mortar (폴리머 시멘트 모르타르를 이용한 철근콘크리트 흄관 라이닝에 관한 연구)

  • 김영집;김한엽;조영구;소양섭
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.333-338
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    • 2000
  • At present, reinforced concrete pipe has been widely used as drain pipe. However, many reinforced concrete pipe is exposed at deteriorated environment by the growth of a sulfur-oxidizing bacterium isolated from corroded concrete. The purpose of this study is to evaluate the effects of lining by polymer-modified mortar on the development in durability of reinforced concrete pipe. Polymer-modified mortars ate prepared with various polymer typer as cement modifier and polymer-cement ratio and rested for compressive and flexural strengths, adhesion in tension, acid resistance test, freezing and thawing test, and lining test of product in the field. From the rest results, it is apparent that polymer-modified mortars have good mechanical properties and durability as lining material. In practice, all polymers can be used as lining materials for reinforced concrete pip, and type of polymer, and polymer-cement ratio and curing conditions are controlled for good lining product.

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Correlation between Lubrication Characteristics of Engine and Fuel Economy (엔진 윤활특성과 연비 상관성에 대한 연구)

  • Oh, JungJoon;Cha, SangYeob;Jeong, DoGon;Lee, JongJu
    • Tribology and Lubricants
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    • v.30 no.3
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    • pp.189-198
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    • 2014
  • This paper presents the results of an experimental investigation of the correlation between the lubrication characteristics of an engine and its fuel economy. Improving the lubrication characteristics of the engine oil is one of the most efficient ways to improve a car's fuel economy. The methods to accomplish this include lowering the viscosity, adding a friction modifier and optimizing the shear stability index of a viscosity index improver. In addition, it is necessary to use different methods to reduce the friction to individual lubrication areas, because different lubrication regimes are used for different engine parts. The experimental investigation in this study is based on design of experiments ; this paper presents the results of a modified Sequence VID test, which is an ASTM standard test used to measure the effects of automotive engine oils on the fuel economy of passenger cars. The results demonstrate the effects of the following lubrication factors on the fuel economy : the low temperature cranking viscosity, high-temperature high shear (HTHS) viscosity, friction modifier, polymer type and shear stability index of the viscosity index improver. Moreover, this study involves an analysis of variance based on design of experiments. The test results show that the HTHS viscosity, friction modifier and shear stability index of the viscosity index improver are more effective than the other factors. Therefore, lowering the viscosity, adding a friction modifier and optimizing the shear stability index of a viscosity index improver should be considered to improve fuel economy.

Effect of Silica Fume in Properties of Polymer Cement Mortar for Concrete Repair (실리카 퓸이 보수용 폴리머 시멘트 모르타르의 성질에 미치는 영향)

  • Song, Hyung-Soo;Lee, Chin-Yong;Min, Chang-Shik
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.617-620
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    • 2006
  • The EVA polymer is used as a modifier in the repair mortar, which contains various admixtures and mineral admixtures. It has been reported that the effect of polymer in cement mortar by the cement-polymer ratio only, but effect of admixtures over the polymer mortar was unknown. In this study, the fresh and mechanical properties of polymer cement mortar influenced by the range of silica fume ratio were investigated. It was found that with increasing the ratio of silica fume, mechanical properties(compressive strength, flexural strength, adhesive strength) of repair mortar is improved and drying shrinkage is increased.

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