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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 50, Issue 4 - Dec 2015
Volume 50, Issue 3 - Sep 2015
Volume 50, Issue 2 - Jun 2015
Volume 50, Issue 1 - Mar 2015
Selecting the target year
Photooxidation of BR Vulcanizate Using High Pressure Mercury Lamp
Kim, Eunha ; Choi, Sung-Seen ;
Elastomers and Composites, volume 50, issue 1, 2015, Pages 1~6
DOI : 10.7473/EC.2015.50.1.001
Polybutadiene rubber (BR) has been well known that its physical and chemical properties are changed when it is exposed to ultraviolet light undergoing photooxidation. In this study, photooxdiation process of BR vulcanizate was investigated using a high pressure mercury lamp used as an outdoor lighting, which has high UV radiation efficiency and reasonable cost. Discoloration and crack formation of photooxdized BR vulcanite surface were examined using an image analyzer. Change of chemical functional groups of BR vulcanite surface by photooxidation was investigated using ATR-FTIR, and variation of the crosslink density with the UV irradiation time was investigated. By increasing the UV irradiation time, the crosslink density steeply increased after a period of time and did not increase any more. Formation of hydroxyl (~OH) and carbonyl (~C=O) groups on the BR vulcanizate surface increased and the1,4-cis unit was converted to the 1,4-trans unit as the photooxidation was proceeded.
Nanocomposites Catalyzed Photodegradation and Kinetics Study of Organic Dyes
Kim, Keun Hyung ; Ko, Weon Bae ;
Elastomers and Composites, volume 50, issue 1, 2015, Pages 7~12
DOI : 10.7473/EC.2015.50.1.007
nanoparticles were synthesized from a 0.1 M
and 0.1 M
solution with stirring for 10 h. The product was washed several times with acetone and heated to
for 6 h. At that time, the color of mixture was a greenish yellow. The graphene/
nanocomposites were prepared with graphene and
nanoparticles by stirring in tetrahydrofuran and heated in an electric furnace at
for 2 h. The
and heated graphene/
nanocomposites were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The graphene/
nanocomposites and heated graphene/
nanocomposites were evaluated as a photocatalyst and discussed about kinetics study for the degradation of organic dyes, such as methylene blue and rhodamine B under ultraviolet light irradiation at 254 nm.
Effects of MWCNT Nucleating Agent on the Formation Reaction of Rigid Polyurethane Foams
Ahn, WonSool ; Lee, Joon-Man ;
Elastomers and Composites, volume 50, issue 1, 2015, Pages 13~17
DOI : 10.7473/EC.2015.50.1.013
A study of the effects of MWCNT as a nucleating agent on the formation reactions of the rigid polyurethane foams (RPUFs) was carried out. Sample PUFs, formulated with grease-type master batch of MWCNT/surfactant, were fabricated by free-rising method. Temperature changes with time during foaming process were measured using a digital thermometer. RPUF foaming process was observed to undergo 2-step processes with temperature inflection around 60 sec after the start of reaction, and then reached slowly the max. temperature. While the max. temperature of neat PUF was measured as ca.
, that of the samples with MWCNT were as higher value as ca.
, and, even the time to reach that temperature was reduced by about 15 sec. Average cell size of PUF samples decreased from 185.1 for the neat PUF to
for the sample of 0.01 phr of MWCNT. As the result, it was considered that MWCNT in RPUF foaming process could play a roll both as a nucleating agent and as a catalyst.
Comparison of Vinyl Acetate Contents of Poly(Ethylene-co-Vinyl Acetate) Analyzed by IR, NMR, and TGA
Kim, Eunha ; Choi, Sung-Seen ;
Elastomers and Composites, volume 50, issue 1, 2015, Pages 18~23
DOI : 10.7473/EC.2015.50.1.018
Vinyl acetate (VA) contents of poly(ethylene-co-vinyl acetate) (EVA) analyzed by infrared spectroscopy (IR), nuclear magnetic spectroscopy (NMR), and thermogravimetric analysis (TGA) were compared. Four grade EVAs supplied by Aldrich Co. and four grade EVAs manufactured by DuPont Co. were used. For IR analysis, VA contents were determined using calibration curve (absorbance ratio of
) of reference EVAs. Correlation coefficients of the calibration curves were not sufficiently high (
). For NMR analysis, VA contents were determined using peaks of
, and CH. VA contents determined by NMR analysis were less than those marked by suppliers more than 10%. For TGA, VA contents were determined using weight loss through deacetylation. VA contents determined by TGA were slightly different with those marked by suppliers. Difference in the VA contents determined by different analytical methods was discussed, and difference in the analytical results according to the EVA suppliers was also examined.
Effects of a Crosslinking Agent and a Compatibilizer on the Mechanical and Rheological Properties of Waste PP and Waste Ground Rubber Tire Composites
Kim, Donghak ; Kim, Seonggil ; Lee, Minji ; Lee, Chanhee ; Lee, Horyong ; Lee, Seongwoo ; Lee, Suhyeon ; Moon, Myeongsuk ; Bang, Daesuk ;
Elastomers and Composites, volume 50, issue 1, 2015, Pages 24~29
DOI : 10.7473/EC.2015.50.1.024
In this study, we investigated the effects of a crosslinking agent and a compatibilizer on the mechanical and rheological properties of waste PP and waste ground rubber tire (WGRT) composites. In order to simulate a commercial TPV, the component of waste PP and WGRT was fixed at 30 and 70 wt%, respectively. With the simple addition of SEBS-g-MA into the waste PP/WGRT composites, the tensile strength of the composite was decreased, whereas both the elongation at break and impact strength were significantly increased because of rubbery characteristics of SEBS-g-MA. In order to further improve the properties of the composites, the waste PP/WGRT/SEBS-g-MA composites was revulcanized with dicumyl peroxide (DCP). As expected, mechanical properties of the revulcanized composites was generally improved. Especially, with 15 and 1 phr of SEBS-g-MA and DCP, elongation at break was highest value of about 183% because of the recross-linking of WGRT without chain scission of the main chain. It was found that complex viscosity of the revulcanized composite increased which might verify further vulcanization of the WGRT.
Enhancement of Dimensional Stability of Compressed Open Cell Rigid Polyurethane Foams by Thermo-Mechanical Treatment
Ahn, WonSool ;
Elastomers and Composites, volume 50, issue 1, 2015, Pages 30~34
DOI : 10.7473/EC.2015.50.1.030
Thermo-mechanical treatment process of a compressed open-cell rigid polyurethane foam (OC-RPUF), which was fabricated for the vacuum insulation panel (VIP), was studied to obtain an optimum condition for the dimensional stability by the relaxation of compressive stress. Thermo-mechanical deformation of the sample OC-RPUF was shown to occur from about
. Yield stress of 0.36 MPa was shown at about 10% yield strain. And, densification of the foam started to occur from 75% compressive strain and could be continued up to max. 90%. Compression set of the sample restored after initial compression to 90% at room temperature was ca. 82%. Though the expansion occurred to about twice of the originally compressed thickness in case of temperature rise to
, it could be overcome and the dimensional stability could be maintained if the constant load of 0.3 MPa was applied. As the result, a thermo-mechanical treatment process, i.e, annealing process at temperature of
for about 20 min as is the maximum compressed state at room temperature, should be required for dimensional stability as an optimum condition for the use of VIP core material.
POSS/Polyurethane Hybrids and Nanocomposites: A Review on Preparation, Structure and Performance
Diao, Shuo ; Mao, Lixin ; Zhang, Liqun ; Wang, Yiqing ;
Elastomers and Composites, volume 50, issue 1, 2015, Pages 35~48
DOI : 10.7473/EC.2015.50.1.035
Polyhedral oligomeric silsesquioxane (POSS) is an important inorganic-organic hybrid material with a three-dimensional structure. Polyurethane (PU) is a widely applied polymer that has versatile properties with the change of two phase structure. When POSS is incorporated into PU by physical or chemical methods, many properties can be greatly improved, such as mechanical properties, thermal stability, biodegradation resistance, and water resistance. This paper reviews the recent progress in preparation, structure, and performance of POSS-modified polyurethane from the viewpoint of physical blending and chemical modification.
Preparation and Characterizations of Polymethylmethacrylate (PMMA)/Acrylate Rubber (ACM) Blend for Light Diffuser Applications
Lee, Byung Hwan ; Chang, Young-Wook ; Lim, Hyung Mi ;
Elastomers and Composites, volume 50, issue 1, 2015, Pages 49~54
DOI : 10.7473/EC.2015.50.1.049
Dynamically vulcanized PMMA/ACM (80 wt%/20 wt%) blend using DCP as a curing agent was prepared using internal mixer. The morphology, mechanical properties, optical properties, melt viscosity and die swell were characterized by using FE-SEM, tensile test, Izod impact test, dynamic mechanical analysis, ARES and capillary rheometer, respectively. The blends show a phase-separated morphology in which ACM are dispersed in PMMA matrix. Dynamically vulcanized blend exhibits higher mechanical properties, higher melt viscosity, and die swell as compared to simple blend. And, the dynamically vulcanized blend showed total transmittance of more than 75% and haze of higher than 90%, which enable it to find potential applications to fabricate an optical diffuser by extrusion process.
Adsorption Property of Silicone Rubber Sticking Chuck for OLED Glass Substrate
Kim, Jin-Hee ; Chung, Kyung-Ho ;
Elastomers and Composites, volume 50, issue 1, 2015, Pages 55~61
DOI : 10.7473/EC.2015.50.1.055
Manufacturing process of OLED contains adsorption-desorption process of glass substrate. There are several adsorption methods of glass substrate such as atmospheric pressure, vacuum and electrostatic adsorption. However, these methods are very complex to connect system. Therefore, the adsorption method using silicone rubber based sticking chuck was proposed in this study. Three types of silicone rubbers having 0, 19.3 and 32.2 wt% of fluorine were used and their mechanical properties, surface energies and adsorption properties were examined. According to the results
and hardness increased with increasing fluorine contents, but elongation was decreased. Also, fluorosilicone rubber containing 32.2 wt% of fluorine showed the lowest surface tension, among three types of rubber and resulted in the highest initial tack with glass substrate. After the adsorption-desorption test of 300,000 cycles was performed, the adsorption force of S-1 (silicone rubber) decreased largely from 2.34 to 0.73 MPa. However, the S-3 (fluorosilicone rubber having 32.2 wt%. of fluorine) decreased only from 3.15 to 2.24 MPa. From this study, we obtained the valuable equations related to long term durability of silicone based sticking chuck. Finally the transfer of silicone rubber to glass substrate with the adsorption-desorption process was not occurred and this phenomenon was examined by UV-Visible spectroscopy.
Preparation and Physical Properties of Poly(lactic acid) Bio-Composites using Surface Modified Microfibriled Celluloses
Yeo, Jun-Seok ; Seong, Dong-Wook ; Hwang, Seok-Ho ;
Elastomers and Composites, volume 50, issue 1, 2015, Pages 62~67
DOI : 10.7473/EC.2015.50.1.062
The surface modification of microfibriled cellulose (MFC) was carried out through the hydrolysis-condensation reaction using (3-aminopropyl)triethoxysilane (APS) and 3-glycidyloxypropyltriethoxysilane (GPS) and then the modified cellulose was compounded with bio-degradable poly(lactic acid) (PLA). Also, pristine MFC was compounded with PLA as a control groups. The confirmation of surface modification for the pristine MFC was characterized by FT-IR and SEM/EDX. The thermal and mechanical properties of the PLA/MFC composites depended on the content of MFC and the type of silane coupling agents. From the thermal, morphological and mechanical behaviors of the PLA/MFC composites, it was found that GPS-MFC was more successful to improve the interface adhesion between PLA matrix and the surface of MFC than that of APS-MFC.