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한국고무학회> Elastomers and composites

Elastomers and composites update

  • : 한국고무학회
  • : 공학분야  >  화학공학
  • : KCI등재
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  • : 연속간행물
  • : 계간
  • : 2092-9676
  • : 2288-7725
  • : 고무학회지(~1997) → 엘라스토머(1998~) → elastomers and composites(2009~)

수록정보
수록범위 : 1권1호(1966)~56권3호(2021) |수록논문 수 : 1,666
Elastomers and composites
56권3호(2021년 09월) 수록논문
최근 권호 논문
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KCI등재

1Facile Fabrication of Carbon Nanotubes@CuO Composites by Microwave Method

저자 : Tae Hyeong Kim , Dun Chan Cha , Jung-chae Jeong , Seunghyun Lee

발행기관 : 한국고무학회 간행물 : Elastomers and composites 56권 3호 발행 연도 : 2021 페이지 : pp. 113-116 (4 pages)

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In this study, we report a facile fabrication of multi-walled carbon nanotubes (MWCNTs)-CuO composites synthesized by a microwave method using MWCNTs and copper oxide (CuO). The number of copper hydrate precursors affect the size and number of CuO domains formed along the MWCNTs in the composites. The domain size is controllable from 239 nm to 348 nm. The composites are characterized by transmission electron microscopy, energy dispersive spectrometry, X-ray diffraction (XRD), Raman spectroscopy, and UV-Vis spectroscopy. The CuO produced in the composites is confirmed to be tenorite with a monoclinic crystal structure through the XRD patterns of (-111), (111) and (-202).

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2Recent Progress on Ionically Conductive Polymer Electrolyte for Electronic Skin Sensors

저자 : Jeong Hui Kim , Jung-chae Jeong , Keun Hyung Lee

발행기관 : 한국고무학회 간행물 : Elastomers and composites 56권 3호 발행 연도 : 2021 페이지 : pp. 117-123 (7 pages)

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Electronic skin (or E-skin) is an artificial smart skin composed of one or more than two sensors. E-skins detect external stimuli and convert them into electrical signals. Various types of E-skin sensors exist, including mechanical, physical, and chemical, depending on the detection signals involved. For wearable E-skins with superior sensitivity and reliability, developing conductors that possess both good elasticity and sensitivity is essential. Typical electrical conductors used in these sensors show very high sensitivity, but they have drawbacks such as non-linearity, irreversibility, and a narrow sensing range. To address these issues, stretchable and lightweight ionic conductors have been actively used in E-skin applications. This study summarizes the recent progress on various types of ionic conductors and ionic-conductor-based E-skin sensors.

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3Non-destructive Evaluation Method for Service Lifetime of Chloroprene Rubber Compound Using Hardness

저자 : Kwang-hwa Park , Chan-gu Lee , Joon-hyung Park , Kyung-ho Chung

발행기관 : 한국고무학회 간행물 : Elastomers and composites 56권 3호 발행 연도 : 2021 페이지 : pp. 124-135 (12 pages)

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Evaluating service lives of rubber materials at certain temperatures requires a destructive method (typically using elongation at break). In this study, a non-destructive method based on hardness change rate was proposed for evaluating the service life of chloroprene rubber (CR). Compared to the destructive method, this non-destructive method ensures homogeneity of CR specimens and requires a small number of samples. Thermal accelerated degradation test was conducted on the CR specimens at 55, 70, 85, 100, and 125℃, and the tensile strength, elongation at break, and hardness were measured. The results of the experiment were compared to those of the accelerated life evaluation method proposed in this study. Comparing the analyzed lives in the high temperature region (70, 85, 100, and 125℃), the difference between the service lives for the destructive method (using the elongation at break) and non-destructive method (using the hardness) was approximately 0.1 year. Therefore, it was confirmed that the proposed non-destructive evaluation method based on hardness changes can evaluate the actual life of CR under thermally accelerated degradation conditions.

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4A Concise Review of Recent Application Progress and Future Prospects for Lignin as Biomass Utilization

저자 : Seo-hwa Hong , Seok-ho Hwang

발행기관 : 한국고무학회 간행물 : Elastomers and composites 56권 3호 발행 연도 : 2021 페이지 : pp. 136-151 (16 pages)

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Biomass lignin, a waste produced during the paper and bio-ethanol production process, is a cheap material that is available in large quantities. Thus, the interest in the valorization of biomass lignin has been increasing in industrial and academic areas. Over the years, lignin has been predominantly burnt as fuel to run pulping plants. However, less than 2% of the available lignin has been utilized for producing specialty chemicals, such as dispersants, adhesives, surfactants, and other value-added products. The development of value-added lignin-derived co-products should help make second generation biorefineries and the paper industry more profitable by valorizing lignin. Another possible approach towards valueadded applications is using lignin as a component in plastics. However, blending lignin with polymers is not simple because the polarity of lignin molecules results in strong self-interactions. Therefore, achieving in-depth insights on lignin characteristics and structure will help in accelerating the development of lignin-based products. Considering the multipurpose characteristics of lignin for producing value-added products, this review will shed light on the potential applications of lignin and lignin-based derivatives on polymeric composite production. Moreover, the challenges in lignin valorization will be addressed.

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5Effect of Vinyl Group Content of the Functionalized Liquid Butadiene Rubber as a Processing Aid on the Properties of Silica Filled Rubber Compounds

저자 : Donghyuk Kim , Byungkyu Ahn , Gyeongchan Ryu , Kiwon Hwang , Sanghoon Song , Wonho Kim

발행기관 : 한국고무학회 간행물 : Elastomers and composites 56권 3호 발행 연도 : 2021 페이지 : pp. 152-163 (12 pages)

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Liquid butadiene rubber (LqBR) is used as a processing aid and plays a vital role in the manufacture of highperformance tire tread compounds. In this study, center-functionalized LqBR (C-LqBR) was polymerized with different vinyl content via anionic polymerization. The effects of the vinyl content on the properties of the compounds were investigated by partially replacing the treated distillate aromatic extract (TDAE) oil with C-LqBR in silica-filled rubber compounds. C-LqBR compounds showed a low Payne effect and Mooney viscosity regardless of the vinyl content, because of improved silica dispersion due to the ethoxysilyl group. As the vinyl content of C-LqBR increased, the optimum cure time (t90) increased owing to a decrease in the number of allylic hydrogen. Moreover, the glass transition temperature (Tg) of the compound increased, and snow traction and abrasion resistance performance decreased, whereas wet grip improved. The energy loss characteristics revealed that the hysteresis attributed to the free chain ends of C-LqBR was dominant.

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6Comparison of Injection Molding Characteristics according to Thickness Variations of Preform for PET bottle

저자 : Nam Hyun Kim , In Young Woo , Kyung Woo Nam , Baek Rim Yeon , Mi Rae Kim , Min-young Lyu

발행기관 : 한국고무학회 간행물 : Elastomers and composites 56권 3호 발행 연도 : 2021 페이지 : pp. 164-171 (8 pages)

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Due to the problem of environmental pollution by plastics, it is necessary to decrease their consumption. In the case of PET bottles, it is essential to reduce the thickness of the bottle for the reduction of plastic used. For manufacturing PET bottles with reduced thickness, it is a prerequisite to design a preform with reduced thickness and study its molding capability. In this study, the injection molding capability was investigated after reducing the body thickness of the preform to 15% and 20%, respectively, for the two preform models currently in use. Injection molding analysis was performed on the existing models and on the models for reduced weight, under the molding conditions of the existing models. Using the computed results, temperature distribution, pressure distribution, deformation and clamping force were compared. Based on the analysis, the injection conditions of the preform model with less thickness were discussed.

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7Effect of Blade Materials on Wear Behaviors of Styrene-Butadiene Rubber and Butadiene Rubber

저자 : Gi-bbeum Lee , Beomsu Shin , Eunjung Han , Dawon Kang , Dae Joon An , Changwoon Nah

발행기관 : 한국고무학회 간행물 : Elastomers and composites 56권 3호 발행 연도 : 2021 페이지 : pp. 172-178 (7 pages)

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The wear behavior of styrene-butadiene rubber (SBR) and butadiene rubber (BR) was investigated using a bladetype abrader with a steel blade (SB), Ti-coated tungsten carbide blade (TiB), or zirconia blade (ZB). The wear rate of SBR against SB and TiB decreased with increasing number of revolutions because of the blunting of the blades during wear. However, the wear rate of SBR against ZB remained nearly constant with little blade blunting. Generally, the wear rate of BR was largely unaffected by the blade material used for abrasion. The wear rate and frictional coefficient of SBR were found to be higher than those of BR at similar levels of frictional energy input. A power-law relationship was found between the wear rate and frictional energy input during abrasion. A well-known Schallamach pattern was observed for SBR, while a much finer pattern was observed for BR. The blade material affects the wear rate of the rubbers because the macromolecular free radicals and blade tend to undergo mechano-chemical reactions. The inorganic ZB was found to be the most inert for such a mechanism.

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8Effect of Carbon-based Nanofillers on the Toughening Behavior of Epoxy Resin

저자 : Gi-bbeum Lee , Haeran Kim , Wonjae Shin , Jinseok Jeon , In-seok Park , Changwoon Nah

발행기관 : 한국고무학회 간행물 : Elastomers and composites 56권 3호 발행 연도 : 2021 페이지 : pp. 179-186 (8 pages)

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Carbon-based nanofillers, including nanodiamond (ND) and carbon nanotubes (CNTs), have been employed in epoxy matrixes for improving the toughness, using the tow prepreg method, of epoxy compounds for high pressure tanks. The reinforcing performance was compared with those of commercially available toughening fillers, including carboxyl-terminated butadiene acrylonitrile (CTBN) and block copolymers, such as poly(methyl methacrylate)-b-poly(butyl acrylate)- b-poly(methyl methacrylate) (BA-b-MMA). CTNB improved the mechanical performance at a relatively high filler loading of ~5 phr. Nanosized BA-b-MMA showed improved performance at a lower filler loading of ~2 phr. However, the mechanical properties deteriorated at a higher loading of ~5 phr because of the formation of larger aggregates. ND showed no significant improvement in mechanical properties because of aggregate formation. In contrast, surface-treated ND with epoxidized hydroxyl-terminated polybutadiene considerably improved the mechanical properties, notably the impact strength, because of more uniform dispersion of particles in the epoxy matrix. CNTs noticeably improved the flexural strength and impact strength at a filler loading of 0.5 phr. However, the improvements were lost with further addition of fillers because of CNT aggregation.

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