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Elastomers and composites update

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  • : 고무학회지(~1997)→엘라스토머(1998~)→Elastomers and Composites(2009~)

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수록범위 : 1권1호(1966)~55권1호(2020) |수록논문 수 : 1,614
Elastomers and composites
55권1호(2020년 03월) 수록논문
최근 권호 논문
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1Mechanical Properties and Morphology of Polyamide/Polypropylene Blends

저자 : Su Young Kim , Jin Uk Ha , Donghyeok Shin , Wooseok Jung , Pyoung-chan Lee

발행기관 : 한국고무학회 간행물 : Elastomers and composites 55권 1호 발행 연도 : 2020 페이지 : pp. 1-5 (5 pages)

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This study examined the effects of the addition of maleic anhydride-grafted polypropylene (PP-g-MA) and poly­olefin elastomer (POE) on polyamide 66 (PA66) and polypropylene (PP) blends. The blends of PA66/PP with PP-g-MA and POE were prepared using a twin screw extruder. Mechanical testing results revealed that the tensile, flexural, and izod impact strengths of the blends were maximized at a PP-g-MA content of 2 phr. The increased mechanical strength of the blends with PP-g-MA was attributed to the compatibilizing effect of the PA66 and PP blends. In addition, as the POE content increased, the impact strength of the blends increased. However, at a high POE con­tent, the tensile and flexural strengths decreased, seemingly because of the lower mechanical properties of POE.

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2Analysis of Peroxide Curing Agents in EVA Compounds and Vulcanizates

저자 : Eunji Chae , Sung-seen Choi

발행기관 : 한국고무학회 간행물 : Elastomers and composites 55권 1호 발행 연도 : 2020 페이지 : pp. 6-12 (7 pages)

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Poly(ethylene-co-vinyl acetate) compounds and vulcanizates containing dicumyl peroxide (DCP) (HD) were pre­pared, and the curing agent and reaction products were analyzed using gas chromatography/mass spectrometry (GC/MS). Samples containing trially cyanurate (TAC) and DCP (HDT) were also prepared and analyzed. Some raw DCP were decom­posed in the injector region of GC to produce acetophenone. DCP was detected in the HD compound but was not observed in the HD vulcanizate, and instead acetophenone and 2-phenyl-2-propanol were detected. Both DCP and TAC were observed in the HDT compound but not in the HDT vulcanizate, where acetophenone and 2-phenyl-2-propanol were detected. Thus, some of the DCP decomposed during the compounding process. The formation mechanism for acetophe­none and 2-phenyl-2-propanol during the crosslinking reaction was identified, and differences in the crosslinking reactions of HD and HDT compounds were discussed.

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3Pot Life Assessment and Mechanical Property of Fast Curing Polyurethane Developed with Eco-friendly Pre-polymer

저자 : Jessy Joseph , Junho Moon , Tae Woong Kong , Dong Ho Kim , Jeong Seok Oh

발행기관 : 한국고무학회 간행물 : Elastomers and composites 55권 1호 발행 연도 : 2020 페이지 : pp. 13-19 (7 pages)

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4,4′-Methylenebis(2-chlorobenzenamine) (MOCA)-free fast curing polyurethanes were prepared. In this study, the processibility of a fast curing polyurethane system was characterized by assessing the pot life. The obtained pot life of the polyurethane was 6-8 s, indicating that this prepolymer-curative system is appropriate for ribbon flow casting. The influence of the NCO index on the viscosity and mechanical properties was evaluated. The viscosity, tensile strength, tear strength, and hardness of the as-prepared polyurethanes showed an increasing trend, with an increase in the NCO index, whereas the elongation at break increased initially and then decreased with an increase in the NCO index. The gel fraction and crosslink density showed a direct correlation with the NCO index, which substantiated the improved mechanical prop­erties at the higher NCO index. The coefficients of friction and abrasion deteriorated with an increase in the NCO index.

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4Effect of NCO Index on the Particle Size of Polycarbonate Diol-based Polyurethane Dispersion

저자 : Dong-eun Kim , Seung-oh Kang , Sang-ho Lee

발행기관 : 한국고무학회 간행물 : Elastomers and composites 55권 1호 발행 연도 : 2020 페이지 : pp. 20-25 (6 pages)

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The effect of the isocyanate index (NCO index) on the particle size and particle size distribution of a waterborne polyurethane dispersion (WPUD) with polycarbonate-diol was determined. The WPUDs were prepared using a conven­tional acetone process with polycarbonate-polyol (Mn = 2028), 4,4′-methylenebis(cyclohexyl isocyanate) (H12MDI), 2,2-bis(hydroxymethyl) propionic acid (DMPA), and dibutyltin dilaurate catalyst. At NCO index values below 1.5, the number average particle diameter of the WPUDs significantly increased with the NCO index, whereas the particle diameter slightly varied at higher NCO indexes. The dependency of the WPUD viscosity on the NCO index exhibited similar behavior to that of the particle size. The relative values of the full width at half maximum of the WPUD particle distribution curves at various NCO indexes were not influenced by the NCO index.

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5Preparation of Silica-Filled SBR Compounds with Low Rolling Resistance by Wet Masterbatch

저자 : Jae-kyoung Yang , Wonhyeong Park , Changseok Ryu , Sun Jung Kim , Doil Kim , Gon Seo

발행기관 : 한국고무학회 간행물 : Elastomers and composites 55권 1호 발행 연도 : 2020 페이지 : pp. 26-39 (14 pages)

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The physical properties of silica-filled SBR compounds (WSBR) prepared using silica-SBR wet masterbatches (WMB) were systematically investigated to understand the effect of the surface treatment of silica on the reinforcement per­formance of SBR. Treatment of silica with bis(triethoxysilylpropyl)tetrasulfide (TESPT) in the liquid phase, followed by mixing with an SBR solution and recovery by water stripping, easily produced silica-SBR WMB. However, insufficient sur­face treatment in terms of the amount and stability of the incorporated TESPT led to considerable silica loss and inevitable TESPT elution. Pretreatment of silica in the gas phase with TESPT and another organic material that enabled the formation of organic networks among the silica particles on the surface provided hydrophobated silica, which could be used to pro­duce silica-SBR WMB, in high yields of above 99%. The amount and type of organic material incorporated into silica greatly influenced the cure characteristics, processability, and tensile and dynamic properties of the WSBR compounds. The TESPT and organic material stably incorporated into silica increased their viscosity, while the organic networks dispersed on the silica surface were highly beneficial for reducing their rolling resistance. Excessive dosing of TESTP induced low viscosity and a high modulus. The presence of connection bonds formed by the reaction of glycidyloxy groups with amine groups on the silica surface resulted in physical entanglement of the rubber chains with the bonds in the WSBR compounds, leading to low rolling resistance without sacrificing the mechanical properties. Mixing of the hydrophobated silica with a rubber solution in the liquid phase improved the silica dispersion of WSBR compounds, as confirmed by their low Payne effect, and preservation of the low modulus enhanced the degree of entanglement.

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6Effect of Eco-friendly Inorganic Flame Retardants on Mechanical and Flame-Retardant Properties of EPDM Compound

저자 : Jong Hwan Do , Do Young Kim , Kwan Ho Seo

발행기관 : 한국고무학회 간행물 : Elastomers and composites 55권 1호 발행 연도 : 2020 페이지 : pp. 40-45 (6 pages)

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In this study, the mechanical and flame-retardant properties of ethylene-propylene-diene-termonomer (EPDM) based rubber compounds and various other environmentally friendly inorganic flame retardants were investigated. Alumina trihydrate (ATH) and magnesium hydroxide (MDH) were used as inorganic flame retardants. The mechanical properties after thermal oxidation aging and the flame-retardant properties of the EPDM compounds were measured using a moving die rheometer, a universal testing machine, a compression set, and a UL 94 V flammability test. We focused on how the properties were affected by the type and amount of flame retardants. The results demonstrated that the optimal mechanical and flame-retardant V-0 grade properties were obtained at an ATH content of 200 phr.

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7Cross-section Morphology and Surface Roughness of an Article Manufactured by Material Extrusion-type 3D Printing according to the Thermal Conductivity of the Material

저자 : In Young Woo , Do Yeon Kim , Hong Pil Kang , Min-young Lyu

발행기관 : 한국고무학회 간행물 : Elastomers and composites 55권 1호 발행 연도 : 2020 페이지 : pp. 46-50 (5 pages)

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Material extrusion (ME)-type 3D printing is the most popular among the 3D printing processes. In this study, the cross-section morphologies of ME-type 3D printing manufactured specimens were observed with respect to the thermal properties of the material. The cross-section morphology of a specimen is related to the deposition strength, and the outside profile of the cross-section is related to the surface roughness. The filaments used in this study, with different thermal con­ductivities, were the acrylonitrile-butadiene-styrene (ABS), the high impact polystyrene (HIPS), the glycol-modified poly­ethylene terephthalate (PETG), and the polylactic acid (PLA). The cross-sections and the surfaces of the 3D manufactured specimens were examined. In ME-type 3D printing, the filaments are extruded through a nozzle and they form a layer. These layers rapidly solidify and as a result, they become a product. The thermal conductivity of the material influences the cooling and solidification of the layers, and subsequently the cross-section morphology and the surface roughness.

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8Characterization on the Thermal Oxidation of Raw Natural Rubber Thin Film using Image and FT-IR Analysis

저자 : Ik-sik Kim , Hwanjeong Cho , Kyung-suk Sohn , Hwa-soon Choi , Sung-uk Kim , Sinkon Kim

발행기관 : 한국고무학회 간행물 : Elastomers and composites 55권 1호 발행 연도 : 2020 페이지 : pp. 51-58 (8 pages)

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In this study, the thermal oxidation of raw natural rubber (NR) was investigated under controlled conditions by optical image and fourier transform infrared (FT-IR) analysis. The thermal oxidation was performed on a transparent thin film of raw NR coated on a KBr window in a dark chamber at 80℃ under low humidity conditions to completely exclude moisture and restrict light oxidation. Images of the thin film of raw NR were obtained before and after thermal oxidation. FT-IR absorption spectra were measured in the transmission mode at different thermal exposure times. The thermal oxi­dation of NR was examined by the changes in the absorption peaks at 3449, 1736, 1447, 1377, 1242, 1072, and 833 cm-1, which corresponded to a hydroxyl group (-OH), a carbonyl group (-C=O) from an aldehyde and a ketone, a methylene group (-CH2-), a methyl group (-CH3), a carbon-oxygen single bond (-C-O) from an epoxide, a carbon-oxygen bond (-C-O) from an ether, an alcohol, a peroxide, or a cyclic peroxide, and a cis-methine group (cis-CCH3=CH-), respectively. In the initial stage of thermal oxidation, two different types of free radicals were produced quickly and randomly by the homolytic cleav­age of a double bond and allylic hydrogen abstraction. Aldehydes and ketones were formed from chain scissions of the dou­ble bonds and alcohols were produced from allylic hydrogen abstraction at the methylene or methyl groups. Two reactions seemed to proceed competitively with each other. At a later stage, oxidative crosslinks seemed to dominate through the com­bination of free radicals such as an allyl radical (CH=CHCH2·), alkoxy radical (RO·), and peroxy radical (ROO·) and the reaction of a hydroperoxide (-ROOH) with a double bond. The image obtained after thermal oxidation showed hardening without cracks. Based on these observations, a plausible two-step mechanism was suggested for chain hardening caused by the thermal oxidation.

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9High Thermal Conductive Natural Rubber Composites Using Aluminum Nitride and Boron Nitride Hybrid Fillers

저자 : June-young Chung , Bumhee Lee , In-kyung Park , Hyun Ho Park , Heon Seob Jung , Joon Chul Park , Hyun Chul Cho , Jae-do Nam

발행기관 : 한국고무학회 간행물 : Elastomers and composites 55권 1호 발행 연도 : 2020 페이지 : pp. 59-66 (8 pages)

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Herein, we investigated the thermal conductivity and thermal stability of natural rubber composite systems con­taining hybrid fillers of boron nitride (BN) and aluminum nitride (AlN). In the hybrid system, the bimodal distribution of polygonal AlN and planar BN particles provided excellent filler-packing efficiency and desired energy path for phonon transfer, resulting in high thermal conductivity of 1.29 W/mK, which could not be achieved by single filler composites. Fur­ther, polyethylene glycol (PEG) was compounded with a commonly used naphthenic oil, which substantially increased ther­mal conductivity to 3.51 W/mK with an excellent thermal stability due to facilitated energy transfer across the filler-filler interface. The resulting PEG-incorporated hybrid composite showed a high thermal degradation temperature (T2) of 290℃, a low coefficient of thermal expansion of 26.4 ppm/℃, and a low thermal distortion parameter of 7.53 m/K, which is well over the naphthenic oil compound. Finally, using the Fourier's law of conduction, we suggested a modeling methodology to evaluate the cooling performance in thermal management system.

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