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한국고무학회> Elastomers and composites

Elastomers and composites update

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

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수록범위 : 1권1호(1966)~54권4호(2019) |수록논문 수 : 1,605
Elastomers and composites
54권4호(2019년 12월) 수록논문
최근 권호 논문
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KCI등재

1Control of Mechanical Properties of Polyurethane Elastomers Synthesized with Aliphatic Diisocyanate Bearing a Symmetric Structure

저자 : Ken Kojio , Shuhei Nozaki , Atsushi Takahara , Satoshi Yamasaki

발행기관 : 한국고무학회 간행물 : Elastomers and composites 54권 4호 발행 연도 : 2019 페이지 : pp. 271-278 (8 pages)

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Polyurethane elastomers (PUEs) were synthesized using trans-1,4-bis(isocyanatomethyl) cyclohexane (1,4- H6XDI), poly(oxytetramethylene) glycol, 1,4-butanediol (BD), and 1,1,1-trimethylol propane (TMP). To control the molecular aggregation state and mechanical properties of these PUEs, hard segment contents of 20 and 30 wt% and BD/TMP ratios of 10/0 and 8/2 were chosen. Differential scanning calorimetry and small-angle X-ray scattering measurements revealed that the degree of microphase separation increased with an increase in both hard segment content and BD ratio. The Young's modulus and strain at break of the 1,4-H6XDI-based PUE were 6-20 MPa and 5-15, respectively. Incorporation of 20% TMP as a cross-linking agent into BD increased the melting temperature of the hard segment chains, that is, heat resistance, and decreased the Young's modulus. This could be due to the low density of the physical cross-linking network and the dispersion of hard segment chains in the soft segment matrix in the PUE in the presence of 20% TMP.

KCI등재

2Synthesis of Biomass-derived Polyurethane by Chain Extender Type

저자 : Mi Hyun Sohn , Xiang Xu Li , Ur Ryong Cho

발행기관 : 한국고무학회 간행물 : Elastomers and composites 54권 4호 발행 연도 : 2019 페이지 : pp. 279-285 (7 pages)

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Bio-based polyester polyols were synthesized using esterification with azelaic acid, sebacic acid, and 1,3-propanediol. Polyurethanes were prepared using chain extenders (1,4-Butanediol, 1,3-Propanediol, and isosorbide) and 4,4'- diphenylmethane diisocyanate with a mixing ratio of 1:1:1.1. Subsequently, the properties of the polymers prepared using the different chain extenders were compared. The synthesis of polyurethane was confirmed by FT-IR, TGA, and GPC. The mechanical properties (hardness, ball rebound, and tensile strength) of the materials were analyzed using shore A tester, taber abrasion, and UTM. heat, chemical, and water resistances of the prepared materials were measured by comparing the tensile strengths according to external changes.

KCI등재

3Preparation of Flexible Terpolymers using Various Metallocene Catalyst/Borate Cocatalyst System and their Epoxidation

저자 : Jung Soo Kim , Jun Choi , Dong Hyun Kim

발행기관 : 한국고무학회 간행물 : Elastomers and composites 54권 4호 발행 연도 : 2019 페이지 : pp. 286-293 (8 pages)

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In this study, flexible poly(ethylene-ter-1-hexene-ter-divinylbenzene) was prepared using four types of metallocene catalysts (rac-Et(Ind)2ZrCl2, rac-SiMe2(Ind)2ZrCl2, rac-SiMe2(2-Me-Ind)2ZrCl2, (C5Me5)TiCl2[O-2,6-iPr2(C6H3)]) and two types of borate catalysts (trityl tetrakisborate and dimethylanilinium tetrakisborate). The yield, catalytic activity, molecular weight, structure, composition, and thermal properties of the terpolymers prepared using the various catalysts and cocatalyst systems were evaluated. Epoxidation of the terpolymers was successfully performed and this transformation was studied by 1H NMR and FTIR.

KCI등재

4Improved Mechanical and Durability Properties of PVC Sheet by Designing Three-Layered Structures

저자 : Jun-young Park , Woo-sang Kim , Hae-cheon Kang , Seokhu Bae , Jeong-hwan Yoon , Juho Yun , Eun-kyoung Lee , Namil Kim

발행기관 : 한국고무학회 간행물 : Elastomers and composites 54권 4호 발행 연도 : 2019 페이지 : pp. 294-298 (5 pages)

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A three-layered PVC sheet consisting of polyvinyl chloride (PVC) and woven polyester fabric was prepared by extrusion and calendering. The flexibility and durability of the PVC were tuned by adding plasticizers, additives, and surface coatings. The tensile and tear strengths of the three-layered PVC sheet were higher than those of commercial two-layered sheet, while exhibiting low weight. The concentrations of the total volatile organic compounds (TVOCs) and formaldehyde (HCHO) emitted from the sheet were also lowered. The PVC sheet remained stable after prolonged exposure to UV light, signifying that the PVC sheet is suitable for cargo screen applications.

KCI등재

5A Study on Adhesion Friction Characteristics of Rubber for Tire Tread

저자 : Yumrak Oh , Seong-hee Jeon , Dong Youm Lee , Hak-joo Kim , Jeong-heon Kim

발행기관 : 한국고무학회 간행물 : Elastomers and composites 54권 4호 발행 연도 : 2019 페이지 : pp. 299-307 (9 pages)

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Rubber friction properties include adhesion friction characteristics of the interface, hysteresis friction characteristics originating from repeated rubber deformations, and cohesion friction characteristics due to wear and tear. Cohesion friction is generally sufficiently small (˂ 3%) that it can be ignored, whereas adhesion friction has a relatively large contribution of 15%, but has not been investigated thoroughly. Therefore, through an adhesion friction study, the adhesion mechanism was examined and the relationship between friction characteristics and adhesion friction on dry surfaces was derived. The wet grip characteristics of tread rubber are fully described by the hysteresis characteristics of tires, but friction characteristics on dry roads are difficult to determine without adhesion factors. The results presented herein demonstrate that the combination of hysteresis and adhesion properties in the tread rubber sufficiently explained the characteristics of the dry grip. Based on the results of this study, technologies will be developed to determine the key factors governing adhesion friction characteristics and improve dry tire braking performance.

KCI등재

6Comparison of Polyphenylene Sulfide Composites Having Different Processing Temperatures and Glass Fibers

저자 : Do Yeon Jeong , Seung Yong Yoo , Chan-gyu Jung , Jaeyong Lee , Sang Hoon Kim , Pyeong-chan Lee , Hyun Wook Lee , Jin Uk Ha

발행기관 : 한국고무학회 간행물 : Elastomers and composites 54권 4호 발행 연도 : 2019 페이지 : pp. 308-312 (5 pages)

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Polyphenylene sulfide (PPS) is a well-known super engineering plastic with a high melting temperature (above 290°C). It is generally insoluble under regular conditions. Therefore, it can be used for replacing metallic materials. Many researchers are looking at the possibility of replacing aluminum in the engine compartment of an automobile. However, studies on PPS are not common as compared to conventional engineering plastics because only a few companies produce super engineering plastics. In this research, the material properties of PPS composites containing two different kinds of glass fibers and produced under different processing temperatures were investigated. The tensile strength of the PPS composites increased as the processing temperature increased. Although glass fibers with similar aspect ratios were compounded under the same processing condition, one of them yielded a higher mechanical strength.

KCI등재

7A Correlation Between Crack Growth and Abrasion for Selected Rubber Compounds

저자 : Hyunsang Lee , Wonseok Wang , Beomsu Shin , Seong Lak Kang , Kailash Chandra Gupta , Changwoon Nah

발행기관 : 한국고무학회 간행물 : Elastomers and composites 54권 4호 발행 연도 : 2019 페이지 : pp. 313-320 (8 pages)

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A typical wear pattern was reported to resemble the fatigue crack growth behavior considering its mechanism, especially for amorphous rubbers such as styrene-butadiene rubber (SBR). In this study, the wear and crack growth rates were correlated using two separate experiments for carbon black and silica-reinforced selected rubber compounds. The wear rate was determined using a blade-type abrasion tester, where the frictional energy input during wearing was measured. The crack propagation rate was determined under different tearing energy inputs using a home-made fatigue tester, with a pureshear test specimen containing pre-cracks. The rates of abrasion and crack propagation were plotted on a log-log scale as a function of frictional and tearing energies, respectively. Reasonable agreement was observed, indicating that the major mechanism of the abrasion pattern involved repeated crack propagation.

KCI등재

8Synthesis and Properties of Polybenzoxazole Copolymers Having Non Linear Units

저자 : So Hee Han , Eung Jae Lee , Jae Kon Choi

발행기관 : 한국고무학회 간행물 : Elastomers and composites 54권 4호 발행 연도 : 2019 페이지 : pp. 321-329 (9 pages)

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A series of poly(hyroxyamide)s (PHAs) was prepared by direct polycondensation reaction of 4,4′-(2,3-pyridinedioxy) dibenzoic acid and/or isophthalic acid with 3,3′-dihydroxybenzidine. The yield percentages of the products were high, and the inherent viscosities of the polymer in DMAc solution at 35℃ were 0.31-0.59 dL/g. All PHA polymers were found to be soluble in polar aprotic solvents such as DMAc, DMSO, NMP, and DMF. On the other hand, LiCl was required to dissolve IPHA-1 in aprotic solvents. Poly(benzoxazole)s (PBOs) were partially soluble in conc-H2SO4; IPBO-4, -5, and -6 were partially soluble in NMP only when LiCl was added to the solution, and the solution was heated. The PBO polymers showed a maximum weight loss in the temperature range of 654-680℃, and the char yields at 900℃ under nitrogen atmosphere exceeded 63%.

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9Preparation of Rubber Particulates for Micro Dust Study using Cryogenic Crushing

저자 : Eunji Chae , Chae Eun Son , Sung-seen Choi

발행기관 : 한국고무학회 간행물 : Elastomers and composites 54권 4호 발행 연도 : 2019 페이지 : pp. 330-334 (5 pages)

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Cryogenic crushing techniques have been employed for recycling waste rubber articles and for extracting residual organic additives present in rubber samples. Rubber particulate derived from tire tread abrasion is one of the key components of road dust. Therefore, in this work, we prepared rubber particulates using a cryogenic crusher and characterized their shapes as well as size distributions according to the type of rubber. The rubber particulates exhibited uneven surfaces with the presence of some small pieces. The order of the particle size distribution was observed to be: NR > BR > SBR. Subsequently, carbon black was added; this led to a decrease in the particle size and the shape becoming rougher. The crushed particulates of the carbon black-filled samples comprised agglomerated shapes of small pieces, which were similar in shape to that of wear debris in tire tread. It was discovered that crosslink density was one of the principal factors that led to the formation of small crushed particulates. The small particulates obtained by cryogenic crushing can be utilized as model rubber particulates for researching micro dust.

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In this work, styrene butadiene rubber (SBR) and styrene butadiene styrene (SBS) were used to modify asphalt, resulting in SBR- and SBS-modified asphalt, respectively. The two modified asphalts were emulsified with a nonionic emulsifier (Span 60) and cationic emulsifiers (ID, DDA) and their phase stabilization was investigated via particle size, Zeta potential, and flow behavior analysis. With increasing amount of the mixed emulsifier, the particle size decreased, leading to an increase in viscosity. The shear thinning behaviors and Zeta potential values ranging from 35-65 mV were determined and remained considerably stable. In addition, the adhesion strength and compression strength of the SBR-and SBS-modified asphalt emulsion were evaluated via surface free energy examination. The remarkable adhesion and compression strengths were estimated when 5 phr ID and 6 phr DDA were added to the emulsified asphalt modified with SBR and SBS. Therefore ID and DDA, the two cationic surfactants, played significant roles in improving the dispersion and interfacial adhesion strength, resulting in the improved adhesion and compression strength of the emulsified asphalts modified with SBR and SBS.

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