Go to the main menu
Skip to content
Go to bottom
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 44, Issue 4 - Dec 2009
Volume 44, Issue 3 - Sep 2009
Volume 44, Issue 2 - Jun 2009
Volume 44, Issue 1 - Mar 2009
Selecting the target year
Biomimetics of Nano-pillar
Hur, Shin ; Choi, Hong-Soo ; Lee, Kyu-Hang ; Kim, Wan-Doo ;
Elastomers and Composites, volume 44, issue 2, 2009, Pages 98~105
The cochlea of the inner ear has two core components, basilar membrane and hair cells. The basilar membrane disperses incoming sound waves by their frequencies. The hair cells are on the basilar membrane, and they are the sensory receptors generating bioelectric signals. In this paper, a biomimetic technology using ZnO piezoelectric nano-pillar was studied as the part of developing process for artificial cochlea and novel artificial mechanosensory system mimicking human auditory senses. In particular, ZnO piezoelectric nano-pillar was fabricated by both low and high temperature growth methods. ZnO piezoelectric nano-pillars were grown on solid (high temperature growth) and flexible (low temperature growth) substrates. The substrates were patterned prior to ZnO nano-pillar growth so that we can selectively grow ZnO nano-pillar on the substrates. A multi-physical simulation was also conducted to understand the behavior of ZnO nano-pillar. The simulation results show electric potential, von Mises stress, and deformation in the ZnO nano-pillar. Both the experimental and computational works help characterize and optimize ZnO nano-pillar.
Development of Biomimetic Scaffold for Tissue Engineering
Park, Su-A ; Lee, Jun-Hee ; Kim, Wan-Doo ;
Elastomers and Composites, volume 44, issue 2, 2009, Pages 106~111
Tissue engineering is a research field for artificial substitutes to improve or replace biological functions. Scaffolds play a important role in tissue engineering. Scaffold porosity and pore size provide adequate space, nutrient transportation and cell penetration throughout the scaffold structure. Scaffold structure is directly related to fabrication methods. This review will introduce the current technique of 3D scaffold fabrication for tissue engineering. The conventional technique for scaffold fabrication includes salt leaching, gas foaming, fiber bonding, phase seperation, melt moulding, and freeze drying. These conventional scaffold fabrication has the limitations of cell penetration and interconnectivity. In this paper, we will present the solid freeform fabrication (SFF) such as stereolithography (SLA), selective laser sintering (SLS), and fused deposition modeling (FDM), and 3D printing (3DP).
Survey of the Fabrication of Dry Adhesive Structures
Cho, Young-Sam ;
Elastomers and Composites, volume 44, issue 2, 2009, Pages 112~115
In nature, some creatures have the ability to walk vertically or upside down on various natural surfaces. One of them, Tokay Gecko has billions of nano-hair at the epidermis of its digital. These nano hairs makes atomistic attractive force to the surface, therefore, it could walk and run on the vertical or upside surfaces. Recently, many researchers tried to fabricate the dry adhesive structure mimicking the nano-hair structure. in this study, I tried to survey these studies to discuss the direction of future fabrication works of dry adhesive structures.
Service Lifetime Prediction of Rubber Vulcanizate Using Circular Deformation Test
Choi, Sung-Seen ;
Elastomers and Composites, volume 44, issue 2, 2009, Pages 116~121
Modification of Rubbers through Chemical Reactions including Controlled/"living" Radical Polymerization Techniques
Joo, Sang-Il ; Cho, Hyun-Chul ; Lee, Seong-Hoon ; Hong, Sung-Chul ;
Elastomers and Composites, volume 44, issue 2, 2009, Pages 122~133
Rubbers, such as natural rubber, polybutadiene, styrene-butadiene rubber, nitrile-butadiene rubber, chlorinated rubber and EPDM, have been continuously improved in response to a heavy demand and a new property requirement from industry. One of the best ways to realize the improvement is the modification of rubbers through chemical reactions, which produce materials with novel properties. In this review, chemical modification reactions of rubbers that contain carbon-carbon double bond units either in their main backbone or as a side group were briefly summarized. The chemical reactions introduce functional groups or functional polymer chains to polymer backbone, which transform a classical rubber to a highly functional material. Especially, we focused on a controlled/"living" radical polymerization techniques, with which a revolutionary broadening of the spectrum of the materials with well defined molecular weight, molecular weight distribution, chain end-functionality and architectures become possible.
Bifunctional Silane (TESPD) Effects on Silica Containing Elastomer Compound Part I: Natural Rubber (NR)
Kim, Kwang-Jea ;
Elastomers and Composites, volume 44, issue 2, 2009, Pages 134~142
Organo bifunctional silane (TESPD) is added into silica containing NR and its effects are investigated with respect to the vulcanization properties, the processability, and the physical properties. The addition of the TESPD into silica filled NR compound increases the degree of crosslinking by formation of a strong 3-dimensional network structure with silica surface via coupling reaction, which results in an improved mechanical property. It also improves the processabilities compared to the Control compound.
A Study on the Stabilization of Asphalt Emulsion with Phase Inversion Emulsification Method
Heo, Woo-Sung ; Lee, Eun-Kyoung ; Choi, Sei-Young ;
Elastomers and Composites, volume 44, issue 2, 2009, Pages 143~149
In this study, asphalt emulsion was manufactured by phase inversion emulsification method with nonionic surfactants(Span 80, Span 60, Tween 80, and Tween 60), anionic surfactant(SLS) and cationic surfactant(Imidazole) in different feeding ratio to make up for the week points of asphalt. Its stabilization was carefully investigated with respect to droplet size, viscosity, zeta potential, and water-proofing property. When the surfactants mixed with nonionic and anionic surfactant were used into the asphalt, a stabilization of the asphalt emulsion was good. As the amount of the mixed surfactant was increased, the droplet size of asphalt emulsion were decreased, while the viscosity and zeta potential were increased. When the surfactants mixed with nonionic and anionic surfactant were used into the asphalt, a stabilization of asphalt emulsion was good.
Effects of the Variation of Silyl Hydride-to-Vinyl Ratios in Dental Polyvinylsiloxane Impression Materials
Ju, Dong-Hyun ; Jeong, Young-Hwa ; Song, Ho-Jun ; Choi, Chang-Nam ; Park, Yeong-Joon ;
Elastomers and Composites, volume 44, issue 2, 2009, Pages 150~155
This study examined the effects of the concentration variation of the silyl hydride (Si-H) functional group in polymethylhydrogen siloxane cross-linker and the vinyl-functional group in silicone prepolymer on the physical properties of the dental polyvinylsiloxane impression materials (PVS). When the SiH/Vinyl ratio was 1.6 (Group
parts), the setting rate was too slow even though their tensile strength was the highest within the tested groups. When the SiH/Vinyl ratio was 3.2 (Group C12), the setting rate was too fast to allow appropriate working time even though their mechanical properties were good. The C14 group showed rather lower tensile strength compared to the groups having lower cross-linker contents. Notably, too much incorporation of cross-linker, like C16 group, induced delay of the setting, by which the mechanical and manipulation properties were detrimentally affected.
A Study on Rheological Properties for Preparing Flow Mark Free PP Compounds
Lee, Yong-Hee ; Nam, Byeong-Uk ; Lim, Jae-Gon ; Choi, Chi-Hoon ;
Elastomers and Composites, volume 44, issue 2, 2009, Pages 156~163
Our objective is to increase the flowability of Polypropylene(PP) compounds and achieve flow mark free surface in injection molded specimen. We have investigated flowabilities of PP compounds which were composed of PP, rubber, talc, and trace amount of additives. Flowability measurement was performed with four types PPs of which molecular weight distributions(MWD) and melt indexes(MI) were different. Rheological properties of the PP compounding materials, such as spiral flow(SF) length, MI, and shear viscosity, were evaluated. When PP with the broad MWD was used, there were remarkable cases where the spiral flow length of low MI PP compound was longer than that of higher MI PP compound. The PP compound having low MI but broad MWD PP has more flowability than the compound with only high MI.
A Study on the Manufacturing and Mechanical Properties of the PA66/EPDM/PP Composites for Enhanced Low Temperature Fracture Resistances
Lee, Tae-Sik ; Yoon, Chang-Rok ; Bang, Dae-Suk ; Ahn, Dae-Young ; Kye, Hyoung-San ; Shin, Kyung-Chul ;
Elastomers and Composites, volume 44, issue 2, 2009, Pages 164~174
PA66/EPDM/PP-g-MA and PA66/EPDM-g-MA/PP-g-MA composites were manufactured by a modular intermeshing twin screw extruder for enhanced low temperature impact resistance with different content of PP-g-MA. The results showed that composite containing 90 wt% of PA66, 8 wt% of EPDM-g-MA, and 2 wt% of PP-g-MA has a optimum value in the thermal and mechanical properties. The characteristics of the composites were analyzed by TGA, DSC, and SEM. From above results, we established that the low interfacial strength and the impact resistance at low temperature shown in a pre-existing PP/EPDM composite were enhanced by grafting with compatibilizer such as maleic anhydride. These results show the possibility of local manufacturing process and cost down with optimum screw configuration for best mixing quality in the twin screw extruder.
A Study on Synthesis of Acrylic Pressure Sensitive Adhesive for Polarizer Film by Solution Polymerization
Lim, Chang-Hyuk ; Jung, Young-Jae ; Cho, Ur-Ryong ;
Elastomers and Composites, volume 44, issue 2, 2009, Pages 175~181
The solution polymerization was conducted to synthesize pressure sensitive adhesive for polarizer film using acrylic monomers. 2-Ethylhexyl acrylate, butyl acrylate, acrylic acid were used as acrylic monomers, benzoyl peroxide as initiator, ethyl acetate as solvent. The ratio of monomers was 2-ethylhexyl acrylate: butyl acrylate: acrylic acid = 25:50:3.6 reflecting
of glass transition temperature in the pressure sensitive adhesive. The amount of initiator was determined as 0.09% to monomer considering wetting power and initial tackiness. The ratio of monomer to solvent was determined as 1:1.7 considering wetting power and transmissivity. The transmissivity of pressure sensitive adhesive increased with decreasing both viscosity and molecular weight due to reducing of refractive index by low entanglement between molecules. In the measurement of pot life, it was found that the storage stability was good at 1:1.7 of monomer: solvent without large change of viscosity during 200 min.