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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 49, Issue 4 - Dec 2014
Volume 49, Issue 3 - Sep 2014
Volume 49, Issue 2 - Jun 2014
Volume 49, Issue 1 - Mar 2014
Selecting the target year
Blocking of Fuel Filter in Aircraft by an Accelerator Blooming
Kim, Ik-Sik ; Hwang, Young-Ha ; Sohn, Kyung-Suk ; Lee, Jung-Hun ; Sohn, Byung-Hoon ;
Elastomers and Composites, volume 49, issue 1, 2014, Pages 1~12
DOI : 10.7473/EC.2014.49.1.1
Blocking of fuel filter in aircraft greatly can affect loss of pilot`s life and of the aircraft. The investigation of failures is, thus, of vital importance in preventing incidents in advance. The fuel filter of aircraft plays an important role in filtering various debris from jet fuel. It filters impurities smaller than 10
particles from jet fuel provided with the speed of 1,330 pounds per hour. It must be replaced per 500 h on the basis of operating time. However, even before reaching 500 h, the warning sign lighted on due to blocking of fuel filter. Recently, these similar defects have happened repeatedly. Therefore, in this study, the cause of blocking fuel filter in aircraft was investigated using various analytical techniques such as FT-IR microscopy, FE-SEM/EDS, and total sulfur determinator. Consequently, the blocking material of fuel filter was identified to an accelerator from the integral fuel tank sealant. And a mechanism for the formation of the blocking material of fuel filter by an accelerator blooming phenomenon in fuel tank was suggested.
Non-isothermal Crystallization Behavior of Poly(glycolide-co-ε-caprolactone-co-L-lactide) Block Copolymer
Choi, Sei-Young ; Song, Seung-Ho ;
Elastomers and Composites, volume 49, issue 1, 2014, Pages 13~23
DOI : 10.7473/EC.2014.49.1.13
In this work, glycolide, L-lactide and
-caprolactone monomers were polymerized into the triblock copolymers by two step polymerization method and their non-isothermal crystallization behaviors were studied by combination of modified Avrami and Ozawa formula for further analysis of their behaviors. The result showed that PGCLA21 gave the highest value for supercooling analysis and super cooling degree increased with L-lactide content. Crystallization velocity constant, however, showed no significant change. The result of cooling function in specific relative crystallization degree showed that the increase of L-lactide content made an effect on the more enhancement of crystallization velocity of the PGCLA than PGCL. The result of big logF(T) value with the L-lactide content above critical point for PGCLA41 and PGCLA21 showed that bigger cooling velocity needed to gain same crystal size compared with PGCL. This means that it gives negative effect in the increase of crystallization velocity.
Effect of 3-Amino-1,2,4-triazole on Microstructure and Properties of Maleated HDPE/Maleated EPDM Blend
Kim, Tae Hyun ; Chang, Young-Wook ; Lee, Yong Woo ; Kim, Dong Hyun ;
Elastomers and Composites, volume 49, issue 1, 2014, Pages 24~30
DOI : 10.7473/EC.2014.49.1.24
3-Amino-1,2,4-triazole (ATA) (2.5 and 5.0 phr) was incorporated into a immiscible maleated ethylene propylene diene rubber(mEPDM)/maleated high density polyethylene(mHDPE) (50 wt%/50 wt%) blend by melt mixing. Effects of the ATA on structure, mechanical and rheological properties of the blend was investigated. FT-IR and DMA results revealed that supramolecular hydrogen bonding interactions between the polymer chains occur by reaction of ATA with maleic anhydride grafted onto the component polymers in the blend, which induces the physical crosslinks in the blend. FE-SEM analysis showed that mEPDM forms a dispersed phase in continuous mHDPE matrix, and the blend with the ATA has finer phase morphology as compared to the blend without the ATA. By the addition of ATA in the blend, there were significant increases in tensile strength, modulus and elongation-at-break as well as elastic recoverability. Melt rheology studies revealed that ATA induced substantial increase in storage modulus and complex viscosity of the blend at the melt state.
A Study on Structure Aanalysis and Synthesis of Polyester Polyol & Polyurethane
Jin, Kyung Ho ; Cho, Ur Ryong ;
Elastomers and Composites, volume 49, issue 1, 2014, Pages 31~36
DOI : 10.7473/EC.2014.49.1.31
Polyester polyols were synthesized by using each one mole of sebacic acid, isophthalic acid, ethylene glycol, and neopentyl glycol. The synthesized polyol had 56.6 mg KOH/g of hydroxy value and 1980 g/mole of molecular weight. From FT-IR structure analysis of polyester polyol, Hydroxy group(-OH) was observed around 3600
, -CH shoulder of sebacic acid at 2950
, carbony group of ester around 1730
, and benzene ring of isophthalic ring was represented at 1600
. In case of polyurethane, hydroxy peak was showed at 3600
, and -NH group around 3300
NMR measurement of polyester polyol, it was found that sebacic acid was represented at 1.3, 1.5, 2.1 ppm, isophthalic acid at 7.3, 8.1, 8.7 ppm, ethylene glycol at 4.2 ppm, and neopentyl glycol at 0.8, 3.2, 3.9 ppm, respectively. In the polyurethane, it is almost the same as spectrum of polyester polyol, but showed very week peak at 7 ppm by benzene ring of toluene diisocyanate.
Preparation and Properties of Polyketone/Rubber Blend to Improve Heat-resistance
Yun, Ju-Ho ; Yoon, Jeong-Hwan ; Ha, Seong-Mun ; Kim, Jong-Hwal ;
Elastomers and Composites, volume 49, issue 1, 2014, Pages 37~42
DOI : 10.7473/EC.2014.49.1.37
Terpolymer polymerized carbon monoxide, ethylene and propylene as monomer, Polyketone is low-cost material compared with general engineering plastics such as polyamide, polyester, polycarbonate. Moreover, it is excellent in mechanical properties, chemical resistance, fuel permeability and abrasion resistance. So, it is attracted attention as the environmental friendly material to replace conventional engineering plastics. In this study, has been prepared Polyketone/Rubber (Ethylene propylene copolymer, Acrylonitrile butadiene rubber, Ethylene acrylic rubber) blends to improve heat resistance and investigated characteristic behavior after heat/oil aging.
Autohesion Behavior of Brominated-Isobutylene-Isoprene Gum Nanocomposites with Layered Clay
Mensah, Bismark ; Kim, Sungjin ; Lee, Dae Hak ; Kim, Han Gil ; Oh, Jong Gab ; Nah, Changwoon ;
Elastomers and Composites, volume 49, issue 1, 2014, Pages 43~52
DOI : 10.7473/EC.2014.49.1.43
The effect of nanoclay (Cloisite 20A) on the self-adhesion behavior of uncured brominated-isobutylene-isoprene rubber (BIIR) has been studied. The dispersion state of nanoclay into the rubber matrix was examined by SEM, TEM and XRD analysis. The thermal degradation behavior of the filled and unfilled samples was examined by TGA and improvement in the thermal stability of the nanocomposites occurred based on the weight loss (%) measurements. Also, addition of nanoclay enhanced the cohesive strength of the material by reinforcement action thereby reducing the degree of molecular diffusion across the interface of butyl rubber. However, the average depth of penetration of the inter-diffused chains was still adequate to form entanglement on either side of the interface, and thus offered greater resistance to peeling, resulting in high tack strength measurements. The improvement in tack strength was only achieved at critical nanoclay loading above 8 phr. Contact angle measurement was also made to examine the surface characteristics. There was no significant interfacial property change by employing the nanoclay.
VOCs Reduction of Visible-light Responsive Photocatalyst coated nylon/polyester composite fiber for Vehicle Interior Parts and Materials
Choi, Sei-Young ;
Elastomers and Composites, volume 49, issue 1, 2014, Pages 53~58
DOI : 10.7473/EC.2014.49.1.53
In this study, characteristics of visible-light responsive photocatalyst Weltouch, especially VOCs reduction of visible-light responsive photocatalyst coated nylon/polyester composite fiber for vehicle interior parts and materials were evaluated. Visible-light responsive photocatalyst Weltouch was observed for both anatase phase and rutile phase. It is activated by light longer than 420nm. VOCs and formaldehyde generated from visible-light responsive photocatalyst treated nylon/polyester composite fiber were reduced confirmly. Visible-light responsive photocatalyst was firmly attached to the surface of nylon/polyester composite fiber without elimination even after 25 times repeated washing. And washing durability of nylon/polyester composite fiber confirmed the excellence that reduction effects of VOCs after repeated washing has appeared as much as before washing.
Effect of Metal Complexes as a Catalyst on Curing Behavior and Mechanical Properties of Silica Filled Epoxy-Anhydride Compounds
Seo, Byeongho ; Lee, Dong-Hoon ; Lee, Noori ; Do, Kiwon ; Ma, Kyungnam ; Kim, Wonho ;
Elastomers and Composites, volume 49, issue 1, 2014, Pages 59~65
DOI : 10.7473/EC.2014.49.1.59
In this study, in order to complete curing reaction of the molding compound comprising an epoxy/anhydride at
for 40 hours, metal coordination complexes such as cobalt (II) acetylacetonate, potassium acetylacetonate, iron (III) acetylacetonate and chromium (III) octoate as a catalyst were applied to the epoxy/anhydride compounds respectively. The weight ratio of an epoxy part/an anhydride part was adjusted to improve the mechanical properties of the molding compound. According to the experimental results, an epoxy/anhydride compound containing chromium (III) octoate showed a high conversion at
for 40 hours as well as a proper processability at room temperature among the several metal coordination complexes. For the mechanical properties of the cured epoxy/anhydride compound, the compounds containing weight ratio from 0.9/1 to 0.5/1 of the epoxy part/anhydride part with chromium (III) octoate showed the high flexural strength, and higher compressive strength was shown with increasing of the hardener part.
Properties of SBR Compound using Silica-graphite Dual Phase Filler
Shin, Ji Hang ; Shanmugharaj, A.M. ; Lee, Pyoung Chan ; Jeoung, Sun Kyung ; Ryu, Sung Hun ;
Elastomers and Composites, volume 49, issue 1, 2014, Pages 66~72
DOI : 10.7473/EC.2014.49.1.66
Carbon coating on silica particles is done by grafting expanded graphite on the silica aggregates. Successful coating of carbon is corroborated using FT-IR, TGA, XPS and TEM. Crystalline nature of coated graphite is corroborated using XRD. Influence of carbon coated silica particles on rheometric and mechanical properties of SBR composites are investigated. Carbon coated silica particles showed significant improvement in rheometric and mechanical properties, when compared to pristine silica filled system corroborating higher polymer-filler adhesion. This fact was further supported by bound rubber content and equilibrium swelling ratios of unvulcanized and vulcanized SBR composites.
Wear Behavior of C/B filled NR Compounds using a Blade-type Abrader
Youn, J.H. ; Kaang, Shinyoung ;
Elastomers and Composites, volume 49, issue 1, 2014, Pages 73~81
DOI : 10.7473/EC.2014.49.1.73
Friction and wear behaviors of natural rubber(NR) compounds were investigated using a blade-type abrader. The effects of temperature, normal load, and rotation speed on wear rate were studied, and wear behaviors of deteriorated compounds were also evaluated. As the rotation speed of specimen and the normal load to specimen increased, the wear rate increased. However, as the experimental temperature increased, the frictional coefficient decreased and the wear rate decreased accordingly. It was found from the wear studies that a power-law relation works between the frictional work input and the wear rate. It was observed that the wear rate dramatically increased by the degradation of the rubber specimen. The wear pattern was developed and the bigger ridge space of the pattern was observed usually in the higher normal load applied. In determining the wear rate of rubber compound, the continuous measurements of wear distance using the blade-type abrader could be successfully used instead of intermittent measurements of wear-loss weight.