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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Elastomers and Composites
Journal Basic Information
Journal DOI :
The Rubber Society of Korea
Editor in Chief :
Volume & Issues
Volume 51, Issue 2 - Jun 2016
Volume 51, Issue 1 - Mar 2016
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Characterization of the UV Oxidation of Raw Natural Rubber Thin Film Using Image and FT-IR Analysis
Kim, Ik-Sik ; Lee, Bok-Won ; Sohn, Kyung-Suk ; Yoon, Joohoe ; Lee, Jung-Hun ;
Elastomers and Composites, volume 51, issue 1, 2016, Pages 1~9
DOI : 10.7473/EC.2016.51.1.1
Characterization of the UV oxidation for raw natural rubber (NR) was investigated in controlled conditions through image and FT-IR analysis. The UV oxidation was performed on a thin film of natural rubber coated on a KBr window at 254 nm and room temperature to exclude the thermal oxidation. Before or after exposure to UV light, image of the NR thin film was observed at a right or tilted angle. FT-IR absorption spectra were measured in transmission mode with the UV irradiation time. The UV oxidation of NR was examined by the changes of absorption peaks at 3425, 1717, 1084, 1477, 1377, and
which were assigned to hydroxyl group (-OH), carbonyl group (-C=O), carbon-oxygen bond (-C-O), methylene group
, methyl group
, and cis-methine group
, respectively. During the initial exposure period, the results indicated that the appearance of carbonyl group was directly related to the reduction of cis-methine group containing carbon-carbon double bond (-C=C-). Most of aldehydes or ketones from carbon-carbon double bonds were formed very fast by chain scission. A lot of long wide cracks with one orientation at regular intervals which resulted in consecutive chain scission were observed by image analysis. During all exposure periods, on the other hand, it was considered that the continuous increment of hydroxyl and carbonyl group was closely related to the decrement of methylene and methyl group in the allylic position. Therefore, two possible mechanisms for the UV oxidation of NR were suggested.
Preparation of Nanosized Palladium-Graphene Composites and Photocatalytic Degradation of Various Organic Dyes
Kim, Jae Jin ; Ko, Weon Bae ;
Elastomers and Composites, volume 51, issue 1, 2016, Pages 10~16
DOI : 10.7473/EC.2016.51.1.10
Nanosized palladium particles were synthesized using palladium(II) chloride, trisodium citrate dihydrate, and sodium borohydride under stirring condition. Nanosized palladium-graphene composites were prepared from palladium nanoparticles, and graphene was enclosed with polyallylamine under stirring condition for 1 h followed by ultrasonication for 3 h. Nanosized palladium-graphene composites were heated in an electric furnace at
for 2 h and characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. UV-vis spectrophotometry was used to evaluate the nanosized palladium-graphene composites as a catalyst in the photocatalytic degradation of various organic dyes such as methylene blue, methyl orange, rhodamine B, and brilliant green under ultraviolet light at 254 nm.
Effects of Peroxides on the Properties of Reclaimed Polypropylene/Waste Ground Rubber Tire Composites Prepared by a Twin Screw Extrusion
Kim, Seonggil ; Lee, Minji ; Lee, Hyeongsu ; Jeong, Hobin ; Park, Yuri ; Jhee, Kwang-Hwan ; Bang, Daesuk ;
Elastomers and Composites, volume 51, issue 1, 2016, Pages 17~23
DOI : 10.7473/EC.2016.51.1.17
In this study, the reclaimed polypropylene (RPP) and waste ground rubber tire (WGRT) were used to simulate the thermoplastic vulcanizate (TPV) for cost reduction and resources recycling. Also, we examined the effects of dicumyl peroxide (DCP) and 2,5-dimethyl-2,5-di-(tert-butylperoxy)-hexane (DTBPH) as peroxide type cross-linking agents to enhance the properties of TPV's. The components of RPP and WGRT were fixed at 30 and 70 wt%, and DCP and DTBPH were added in the concentrations from 0.5 to 1.5 phr, respectively. RPP/WGRT composites with different contents of DCP and DTBPH were prepared by a modular intermeshing co-rotating twin screw extruder. The Young's modulus of composites were decreased with increasing peroxides contents. On the other hand, tensile strength, elongation at break, and impact strength of the composites were increased with peroxide contents. We also confirmed that interfacial adhesion between RPP and WGRT was considerably improved by adding the peroxides. Taken together, DTBPH added RPP/WGRT composites exhibited better mechanical properties rather than those of DCP added composites.
The Investigation of Rheological Properties Development for Polymer Matrix Including Foaming Agent
Lee, Seung Hak ; Kim, Dong Gun ; Lim, Sung Wook ; Park, Eun Young ; Park, Tae Sun ; Hyun, Kyu ;
Elastomers and Composites, volume 51, issue 1, 2016, Pages 24~30
DOI : 10.7473/EC.2016.51.1.24
Sole in the footwear usually modified with foaming agent on the polymer resin to improve the lightweightness and crush-cushion effect. In this study, we investigated rheological properties for polymer resin filled with the different type and concentration of foaming agent, capsule type foaming agent and organo-chemical foaming agent, under the time sweep test. Curing times of each polymer resin with different kind of foaming agent are delayed than reference material (epoxy resin with curing agent). In case of adding capsule type foaming agent, however, there is appropriate concentration to reduce the curing time, relatively. When foaming agent is activated, foaming force inflates the sample in contrast to condensation force of curing and then axial normal force develop to the (+) direction. Interestingly, by increase concentration of foaming agent, there is a specific point to break down the axial normal force development. The reason for this phenomenon is that coalescence of foams induce the blocking of axial normal force development.
Photocatalyst Effect of Polyester Fabrics Treated with Visible-light Responsive Photocatalyst
Choi, Sei Young ;
Elastomers and Composites, volume 51, issue 1, 2016, Pages 31~37
DOI : 10.7473/EC.2016.51.1.31
In this study, we studied the photocatalytic functionality such as deodorant, antibacterial, antistatic of polyester fabrics treated with visible-light responsive photocatalyst. According to UV/visible spectrometry result, the UV-visible peak of visible-light responsive photocatalyst was found to be red shift at 420 nm sensitive in the visible light region. Also, the deodorizing and antimicrobial performance were shown to be retained more than 99% both before washing and even after 25 times washing. According to washing durability of polyester fabrics treated with visible-light responsive photocatalyst, the reduction effects for gas such as ammonia, trimethylamine, formaldehyde and toluene after 25 times washing appeared to be retained as much as before washing. At both before washing and after 25 times washing, antistatic property showed frictional voltage of approximately 250V.
A Study on Magnetic Property Improvement of Rubber Magnets for Heat Loss Reduction of a Refrigerator
Ahn, WonSool ; Lee, Haakil ; Ha, Ji Soo ;
Elastomers and Composites, volume 51, issue 1, 2016, Pages 38~42
DOI : 10.7473/EC.2016.51.1.38
For improving the heat loss of a refrigerator around door gasket, it is very important to reduce the amount of rubber magnet used, of which thermal conductivity is much higher than the plastics, and enhancing the magnetic properties of rubber magnet itself is crucial for this. In the present study, therefore, a relationship between the optimum conditions of rubber magnet fabrication process and raw material compositions in the ferrite powder/CPE binder compounds was investigated for finding a way to enhance the magnetic properties of rubber magnet. Magnetic attraction forces of a sample rubber magnet was measured as function of distance, and thermal properties of the sample ferrite powder/CPE binder compound were analyzed with TG/DTA thermal analyzer. As a results, a rubber magnet strip with enhanced magnetic properties was expected to be fabricated, of which raw material compound was prepared by compounding with higher ferrite magnetic powder concentration.
A Study on Surface Treatment for Rubber Materials with Low Friction Factor
Li, Xiang-Xu ; Cho, Ur Ryong ;
Elastomers and Composites, volume 51, issue 1, 2016, Pages 43~48
DOI : 10.7473/EC.2016.51.1.43
Multi-Surface (MS) treatment is a new technique of surface treatment to reduce the static friction factor on the surface of rubber. MS treatments include 4 methods which names are MS-V (UV-irradiation on the rubber surface), MS-M (doing the chemical reaction with double bond of rubber), MS-Q (dilution of rubber surface by silicone surfactant), and MS-P (coating and heating of rubber surface). The experiment and test of every MS-treatment had been carried out using acrylonitrile-butadiene rubber (NBR), ethylene-propylene-diene rubber (EPDM), and chlorosulphonated rubber (CSM) as rubber materials. It had introduced the steps of every MS-treatment process and the result of the properties test. From the research, it was found that the best method was MS-V treatment because it suited all the samples and the effect was obviously.
Preparation of [C
Nanocomposites and Kinetics Study for Photocatalytic Degradation of Organic Dyes
Kim, Jae Jin ; Ko, Weon Bae ;
Elastomers and Composites, volume 51, issue 1, 2016, Pages 49~55
DOI : 10.7473/EC.2016.51.1.49
Nanosized cobalt disulfide (
) particles were synthesized with 0.08 M cobalt chloride hexahydrate (
) and 0.2 M sodium thiosulfate pentahydrate (
) dissolved in distilled water under microwave irradiation.
nanocomposites were prepared with nanosized
particles and [
]fullerene as heated by
for 2 h in an electric furnace. X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) identified the heated
nanocomposites were investigated the activity of photocatalytic degradation as a catalyst in various organic dyes like acid yellow 23, methylene blue, methyl orange, and rhodamine B with ultraviolet light at 254 nm by UV-vis spectrophotometer.
Study on the Isothermal Crystallization Behaviors of PEN/TLCP Blends
Park, Jong-Ryul ; Yoon, Doo-Soo ; Lee, Eung-Jae ; Bang, Moon-Soo ; Choi, Jae-Kon ;
Elastomers and Composites, volume 51, issue 1, 2016, Pages 56~62
DOI : 10.7473/EC.2016.51.1.56
The isothermal crystallization behaviors of blends of poly(ethylene naphthalate) (PEN) and a thermotropic liquid crystalline polymer (TLCP) were investigated by differential scanning calorimetry (DSC) as functions of crystallization temperature and blend composition. Avrami analyses were applied to obtain information on the crystal growth geometry and the factors controlling the rate of crystallization. The crystallization kinetics of the PEN/TLCP blends followed the Avrami equation up to a high degree of crystallization, regardless of crystallization temperature. The calculated Avrami exponents for PEN/TLCP revealed three-dimensional growth of the crystalline region in each blend. The crystallization rate of each blend increased as the crystallization temperature decreased, and decreased as the TLCP content increased. The crystallization of PEN in the blend was affected by the addition of TLCP, which acts as a nucleating agent.
Analysis of Poly(Ethylene-co-Vinyl Acetate) Using Off-line Pyrolysis
Choi, Sung-Seen ; Kim, Eunha ;
Elastomers and Composites, volume 51, issue 1, 2016, Pages 63~67
DOI : 10.7473/EC.2016.51.1.63
Poly(ethylene-co-vinyl acetate) (EVA) was pyrolyzed to eliminate acetic acid of VA unit using off-line pyrolysis, and the deacetylated EVA was analyzed infrared spectroscopy (IR) and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). EVA film for deacetylation was prepared by solution casting on aluminum foil and it was pyrolyzed at low temperature of
in the off-line pyrolysis apparatus. After deacetylation, carbon-carbon double bond (C=C) was formed by 1,2-elimination of the VA unit in the EVA backbone. Most of C=C bonds were trans-1,4-unit and 1,2-unit was also observed. Presence of the 1,2-unit in deacetylated EVA indicates that terminal or branch VA units exist in the raw EVA. Py-GC/MS chromatogram of deacetylated EVA displayed much smaller acetic acid and much more abundant other pyrolysis products than that of raw EVA, which means that the pyrolysis efficiency and separation condition were improved.