• Title/Summary/Keyword: RUBBER COMPOSITE

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Development and Characterization of Asymmetric Swelling-Induced Wrinkles on Natural Rubber Surface

  • Lee, Gi-Bbeum;Sathi, Shibulal Gopi;Kim, Min Jung;Park, Changsin;Huh, Yang Il;Nah, Changwoon
    • Elastomers and Composites
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    • v.51 no.4
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    • pp.342-349
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    • 2016
  • Characteristics of the swelling-induced wrinkles on the surfaces of natural rubber (NR) film were investigated. The wrinkle structure was generated by swelling of NR film pre-stretched and firmly bonded onto an aluminum substrate in hexane. A novel experimental method was adopted to replicate the swelling-induced wrinkles on the NR film using an epoxy-hardener system. To get insight into the wrinkle parameters; the wrinkle length (L), wrinkle distance (D), wrinkle height (H) and the angle between two consecutive wrinkles (${\theta}$), the cross-sections of the replicas obtained from saturated swollen NR film were examined using an optical microscopy (OM). From the OM images, the wrinkling parameters were measured as a function of the thickness of NR film from 0.42 to 1.76 mm. Also, it was evaluated that the effects of swelling time on the wrinkling parameters. The length (L), distance (D) and height (H) of wrinkles increased as the thickness of the NR film and the swelling time increased. However, the angle between the wrinkles (${\theta}$) showed a sharp decrease up to a swelling time of 200 minutes and slightly decreased afterwards.

Comparative Evaluation of Manufacturing Properties of Carbon Fiber Reinforced Thermoplastic Polymer (CFRTP) according to Nanofiller Type (나노필러 종류에 따른 열가소성 탄소 섬유강화 복합재료의 제작 물성 비교 평가)

  • Jun Ha Park;Soon Ho Yoon;Minkook Kim
    • Composites Research
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    • v.37 no.3
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    • pp.186-189
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    • 2024
  • This study compared and evaluated the mechanical properties of carbon fiber reinforced thermoplastic polymer (CFRTP) mixed with nanofillers. After mixing various nanofillers such as Multi-wall carbon nanotube (MWCNT), Silicon oxide, Core shell rubber, and Aramid nanofiber with Polyamide 6 (PA6) resin, this is used as a matrix to create a carbon fiber reinforced composite material (CFRP) was manufactured and its physical properties were measured. Depending on the type and mixing ratio of nanofiller, tensile strength, inter-laminar shear strength (ILSS), and Izod impact strength were measured. In terms of tensile strength and impact strength, the highest values were obtained when mixing core shell rubber, however the ILSS was optimal when mixing less than 1 wt.% of silicon oxide.

Study on the Change of Physical Properties with Silica Contents in Solution Styrene-Butadiene Rubber (SSBR)/Silica Composites

  • Kim, Tae Yeop;Won, Sung Yeon;Kang, Shin Hye;Cho, Ur Ryong
    • Elastomers and Composites
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    • v.52 no.1
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    • pp.17-21
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    • 2017
  • The optimum mixing conditions of silica and silane containing rubber composites were evaluated by investigating the properties of rubber composites prepared with a silica composition of 10, 20, 40, 60, and 80 g, respectively. The crosslinking rate decreased with increasing silica content, with he promoters being adsorbed on the silica surface with in the rubber composite. As a result, the increase in crosslinking time resulted in the destruction of the silica structure. The increase of the bound rubber content due to the destruction of the silica structure inhibited the chain motion of the polymer molecules and reduced the cohesion of the silica itself. Finally, the increase of silica content showed the increase of hardness, tensile strength, and storage modulus of rubber composites.

The Effect of the Shape of the Precured CIIR on the Physical Properties of the BR/CIIR Composites

  • Pyo, Kyeongdeok;Park, Chacheol
    • Elastomers and Composites
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    • v.50 no.4
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    • pp.258-264
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    • 2015
  • Rubber composites were prepared by precured CIIR pulverized at knead shear force in order to research the effects of the BR/PCP composites. The particle size of domain in BR/CIIR composites was decreased and homogeneously dispersed by the precured CIIR pulverized. However, it was difficult to use the product when the content is 40 phr and precured of 40%. BR/PCP composites have improved mechanical properies as compared that of the addition of simply cut chip composite.

Evaluation of 1,1,2-trichloroethylene Removal Efficiency Using Composites of Nano-ZnO Photocatalyst and Various Organic Supports (다양한 유기계 지지체와 광촉매 Nano-ZnO 복합체를 활용한 1,1,2-trichloroethylene 제거 효율 평가)

  • Jang, Dae Gyu;Ahn, Hosang;Kim, Jeong Yeon;Ahn, Chang Hyuk;Lee, Saeromi;Kim, Jong Kyu;Joo, Jin Chul
    • Journal of Korean Society of Environmental Engineers
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    • v.36 no.11
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    • pp.771-780
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    • 2014
  • In this study, the various organic supports (i.e., silicone, acrylonitrile-butadiene-styrene, epoxy, and, butadiene rubber) with great sorption capacity of organic contaminants were chosen to develop nano-ZnO/organic composites (NZOCs) and to prevent the detachment of nano-ZnO particles. The water resistance of the developed NZOCs were evaluated, and the feasibility of the developed NZOCs were investigated by evaluating the removal efficiency of 1,1,2-trichloroethylene (TCE) in the aqueous phase. Based on the results from water-resistance experiments, long-term water treatment usage of all NZOCs was found to be feasible. According to the FE-SEM, EDX, and imaging analysis, nano-ZnO/butadiene rubber composite (NZBC) with various sizes and types of porosity and crack was measured to be coated with relatively homogeneously-distributed nano-ZnO particles whereas nano-ZnO/silicone composite (NZSC), nano-ZnO/ABS composite (NZAC), and nano-ZnO/epoxy composite (NZEC) with poorly-developed porosity and crack were measured to be coated with relatively heterogeneously-distributed nano-ZnO particles. The sorption capacity of NZBC was close to 60% relative to the initial concentration, and this result was mainly attributed to the amorphous structure of NZBC, hence the hydrophobic partitioning of TCE to the amorphous structure of NZBC intensively occurred. The removal efficiency of TCE in aqueous phase using NZBC was close to 99% relative to the initial concentration, and the removal efficiency of TCE was improved as the amount of NZBC increased. These results stemmed from the synergistic mechanisms with great sorption capability of butadiene rubber and superior photocatalytic activities of nano-ZnO. Finally, the removal efficiency of TCE in aqueous phase using NZBC was well represented by linear model ($R^2{\geq}0.936$), and the $K_{app}$ values of NZBC were from 2.64 to 3.85 times greater than those of $K_{photolysis}$, indicating that butadiene rubber was found to be the suitable organic supporting materials with enhanced sorption capacity and without inhibition of photocatalytic activities of nano-ZnO.

Analysis of Surface Degradation on Accelerated UV-treated Polymeric Housing Materials for Outdoor Insulator (자외선 가속열화에 따른 옥외용 폴리머 절연재료의 표면열화 분석)

  • Yeon, Bok-Hui;Lee, Sang-Yong;Heo, Chang-Su;Sim, Dae-Seop;Jo, Han-Gu
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.50 no.10
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    • pp.479-488
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    • 2001
  • The effects of accelerated Ultraviolet (UV) radiation on High temperature vulcanized (HTV), Room temperature vulcanized (RTV) silicone rubber and two types of ethylene propylene diene terpolymer (EPDM) used for composite insulator were inverstigated by hydrophobicity class (HC), surface voltage decay after corona charging, SEM-EDS, FTIR and XPS. The contact angle in two kinds of silicone rubber was scarcely change, but EPDM occurred to the loss of hydrophobicity followed by surface cracking and chalking. The surface voltage decay on UV-treated silicone rubber and EPDM showed a different decay trend with UV treatment. EDS and XPS analysis indicated that the oxygen content increased with UV treatment time in all samples. For silicone rubber, the oxidized groups of inorganic silica-like structure increased with UV treatment time. The oxidized carbon of C=0, O=C-O in EPDM increased. These oxidized surface for each material had different electrostatic characteristics, so deposited charges were expected to have different impacts on their surface hydrophobicity. The degradation mechanism based on our results was discussed.

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Characteristices for the Electric Field of Composite Insulator Silicone Shed (Composite Insulator silicone shed 전계특성)

  • Jang, Yoon-Ki;Choi, Sung-Man;Chung, Young-Soo;Lee, Dong-Woen;Kim, Jung-Bae
    • Proceedings of the KIEE Conference
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    • 2008.10a
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    • pp.99-100
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    • 2008
  • Composite insulators are rapidly replacing their porcelain counterparts in electrical substation applications. The composite insulator provide technical and safety ad vantages over other types of insulator. These insulators consist of a FRP(Fiber-reinforced polymer), with two metal flanges and silicone rubber. In this paper, we have investigated the influence of electric field different shaped silicone shed under $SF_6$ gas. As a result, shape of silicone rubber does not effected a electric field. However, the shape of shed can be decided the creepage distance.

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The Comparative Study on Attached Performance of the Rubber Asphalt Membrane-Sheet Composite Waterproof by Difference of the Specific Gravity of the Petroleum Resin (석유수지 비중차를 이용한 고무아스팔트 도막-시트 복합방수의 부착성능 비교 연구)

  • Yoon, Sung Hwan;Park, Wan Goo;Kim, Dong Bum;Park, Jin Sang;Oh, Sang Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.11a
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    • pp.130-131
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    • 2017
  • The combined waterproofing technique, which forms the waterproofing layer of two or more substances, is characterized by forming a waterproof layer, which is characterized by the formation of waterproof layers and the thickness of the waterproofing layer is inherently formed. In this study, it is intended to verify the integrity of the material through the manufacture of materials for special purpose waterproofing methods, primarily for the manufacture of composite waterproofing materials and composite waterproofing methods using cement materials and materials.

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Physical Properties of Silicone Rubber/Clay Composites According to the Clay Type and Modification (Clay의 종류 및 표면처리가 silicone rubber/clay 복합체의 물성에 미치는 영향)

  • Yoon, Jin-San;Kim, Eung-Soo;Kim, Eun-Jeong;Lee, Tae-Hwa
    • Elastomers and Composites
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    • v.44 no.3
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    • pp.260-268
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    • 2009
  • Modification of clay surface was attempted by treating the clay with bis[(3-triethoxysilylpropyl)tetra sulfide (TSS) to raise the hydrophobicity and to induce a chemical reaction between the clay and the high temperature vulcanization-type silicone rubber matrix with purpose of improving the compatibility between the components, and thereby Na-$MMTS_4$ and Fe-$MMTS_4$ were synthesized by treating Na-MMT and Fe-MMT with TSS, respectively. Silicone rubber/clay composites were prepared by compounding the clays with silicone rubber. Thermal stability and mechanical properties were evaluated as a function of the clay types and the surface modification.

Effect of Interface in Three-phase Cord-Rubber Composites (세 가지 상을 갖는 코드섬유-고무 복합재료의 계면의 영향)

  • Kim, Jong-Kuk;Yum, Young-Jin
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.33 no.11
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    • pp.1249-1255
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    • 2009
  • Cord-rubber composites widely used in tires show very complicated mechanical behavior such as nonlinearity and large deformation. Three-phase(cord, rubber and the interface) modeling has been used to analyze the stress distribution in the cord-rubber composites more accurately. In this study, finite element methods were performed using two-dimensional generalized plane strain element and plane strain element to investigate the stress distribution and effective modulus of cord-rubber composites. Neo Hookean model was used for rubber property and several interface properties were assumed for various loading directions. It was found that the interface properties affect the effective modulus and the distributions of shear stress.