• Title, Summary, Keyword: Elastomeric Composites

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Effects of Strain-Induced Crystallization on Mechanical Properties of Elastomeric Composites Containing Carbon Nanotubes and Carbon Black (탄소나노튜브 및 카본블랙 강화 고무복합재료의 변형에 의한 결정화가 기계적 특성에 미치는 영향)

  • Sung, Jong-Hwan;Ryu, Sang-Ryeoul;Lee, Dong-Joo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.9
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    • pp.999-1005
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    • 2011
  • The effects of strain-induced crystallization (SIC) on the mechanical properties of elastomeric composites as functions of extension ratio (${\lambda}$), multiwalled carbon nanotube (CNT) content, and carbon black (CB) content are investigated. The differential scanning calorimetry (DSC) analysis shows that the degree of crystallinity increases with the increase in the CB and CNT content. As ${\lambda}$ increases, the glass transition temperature (Tg) of the composites increases, and the latent heat of crystallization (LHc) of the composites is maximum at ${\lambda}$=1.5. It is found that the mechanical properties have a linear relation with LHc, depending on the CNT content. According to the TGA (thermogravimetric analysis), the weight loss of the composite matrix is 94.3% and the weight of the composites decreases with the filler content. The ratio of tensile modulus ($E_{comp}/E_{matrix}$) is higher than that of tensile strength (${\sigma}_{comp}/{\sigma}_{matrix}$) because of the CNT orientation inside the elastomeric composites.

Effect of Surface Treatments with Flame Plasma and Silane on Mechanical Properties of Silica Reinforced Elastomeric Composites (화염 플라즈마 및 실란 표면처리가 실리카 강화 고무복합재료의 기계적 특성에 미치는 영향)

  • Lee, Jun-Man;Ryu, Sang-Ryeoul;Lee, Dong-Joo
    • Composites Research
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    • v.24 no.6
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    • pp.18-24
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    • 2011
  • The effect of surface treatments with the atmospheric pressure flame plasma (APFP) and epoxy silane (ES) is experimentally investigated to yield the best mechanical properties of silica ($V_f=40%$) reinforced elastomeric composites. The tensile strength of the composites is increased significantly with decrease the mean diameter. When the diameter is $2.2{\mu}m$, that of the composite is increased about 1.4 times compared to the matrix (2.52 MPa). Also, the tensile strength of silica reinforced composites with APFP and ES treated is increased 8.8~13.3%, 9.9~12.5%, respectively. When the diameter is $26.6{\mu}m$, the tensile modulus of the composite is increased about 2 times compared to the matrix (0.88MPa), and the tensile modulus of silica reinforced composites with APFP and ES treated is increased 15.6~22.8%, 21.1~5.8%, respectively. Conventional silane coupling agent treatment have a few disadvantages because of using organic solvents. However APFP treatment is a fast, economic and eco-friendly method to improve the mechanical properties.

Curing Behavior and Tensile Strength of Elastomeric Polyester and Polyvinylidene Fluoride for Automotive Pre-primed Coatings (자동차용 Pre-primed 적용을 위한 Polyester 및 Polyvinylidene Fluoride 도료의 경화거동과 인장강도 특성)

  • Hwang, Hyeon-Deuk;Moon, Je-Ik;Lee, Yong-Ju;Kim, Hyun-Joong;Hyun, Jin-Ho;Noh, Seung Man;Kang, Choong Yeol;Lee, Jae-Woo;Nam, Joon Hyun;Park, Jong Myung
    • Journal of Adhesion and Interface
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    • v.10 no.4
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    • pp.155-161
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    • 2009
  • The most upcoming technical issue of automotive coating is the compact coating process. Pre-primed coating is the outstanding technology eliminating electro-deposition and primer coating process. The main properties of pre-primed coating for automotive are flexibility, corrosion resistance, and weldability. Therefore, we synthesized the conventional polyester, elastomeric polyester and polyvinylidene fluoride resins and evaluated their properties to use as weldable pre-primed automotive coatings. As the results of flexibility and curing behavior, the elastomeric polyester coating was most appropriate to use for the pre-primed automotive coatings.

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A Study of Lianis Model for Elastomeric Bushing in Axial Mode (일래스토메릭 부싱의 축방항모드에 대한 리아니스 모델연구)

  • Lee, Seong-Beom
    • Elastomers and Composites
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    • v.37 no.3
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    • pp.151-158
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    • 2002
  • An elastomeric bushing which has been considered in this research is a device used in automotive suspension systems to reduce the forte transmitted iron the wheel to the frame of the vehicle. A bushing is modeled at a hollow cylinder which is bonded to a solid metal shaft at its inner surface and a metal sleeve at its outer surface. Lianis constitutive equation for a nonlinear viscoelastic incompressible material is used to model the elastomeric material of the bushing. It is used to derive a force-displacement relation for axial response of the bushing. The displacement dependent force relaxation function for the bushing is obtained from the ramp displacement control tests with an extrapolation method. This is compared with the exact result obtained from the step displacement control test and the results are in very good agreement.

A review: role of interfacial adhesion between carbon blacks and elastomeric materials

  • Kang, Min-Joo;Heo, Young-Jung;Jin, Fan-Long;Park, Soo-Jin
    • Carbon letters
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    • v.18
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    • pp.1-10
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    • 2016
  • Carbon blacks (CBs) have been widely used as reinforcing materials in advanced rubber composites. The mechanical properties of CB-reinforced rubber composites are mostly controlled by the extent of interfacial adhesion between the CBs and the rubber. Surface treatments are generally performed on CBs to introduce chemical functional groups on its surface. In this study, we review the effects of various surface treatment methods for CBs. In addition, the preparation and properties of CB-reinforced rubber composites are discussed.

Mechanical Properties of Elastomeric Composites with Atmospheric-Pressure Flame Plasma Treated Multi-Walled Carbon Nanotubes and Carbon Black (대기압 화염 플라즈마 처리한 다중벽 탄소나노튜브 및 카본블랙 강화 고무복합재료의 기계적 특성 연구)

  • Sung, Jong-Hwan;Lee, Dong-Joo;Ryu, Sang-Ryeoul;Cho, Yi-Seok
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.34 no.9
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    • pp.1209-1215
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    • 2010
  • The effects of multi-walled carbon nanotube (MWCNT) content, carbon black (CB) content, atmospheric-pressure flame plasma (APFP) treatment, and acid treatment on the mechanical properties of elastomeric composites were investigated. For pure or filled rubbers with the given amount of CB (20 and 40 phr), the tensile strength and modulus of the elastomeric composites increase similarly with the MWCNT content. A composite with APFP-treated MWCNTs shows a hardening effect (high strength, high modulus, and high ductility) unlike the one with untreated MWCNTs. On the other hand, a composite with APFP-treated CB shows a softening effect (high strength, low modulus, and high ductility), which is unlike a composite with untreated CB. As the refluxing time increases from 1 h to 2 h and the sulfuric acid concentration increases from 60% to 90%, the tensile strength and modulus of a composite decrease. Thus, it is found that the MWCNT content, CB content, APFP treatment, sulfuric acid concentration, and refluxing time have an important effect on the mechanical properties of NBR composites.

Assessment of Geosynthetic Properties of Rubber Reinforced Composites (고무강화 복합재료의 지반용 특성 평가)

  • Jeon, H.Y.
    • Elastomers and Composites
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    • v.34 no.3
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    • pp.247-252
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    • 1999
  • Rubber related geosynthetics(GS) as reinforcement and water barrier materials were manufactured by thermal bonding method and examined the their performance for applications to civil and environmental engineering fields. The spunbonded polyester nonwoven, fiber glass mat and fabric type geogrid of a high tenacity polyester filament were used as matrix and polyester film, elastomeric bitumen with SBS polymer and asphalt were used as reinforcements to manufacture the rubber related geosynthetics. A fiber glass mat and geogrid matrix GS showed more excellent mechanical properties and nonwoven and elastomeric bitumen matrix showed the more excellent permittivity. Softening points of rubber and asphalt mixture showed no difference and dimensional stability at high temperature, $120^{\circ}C$, represented no significant shrinkage. Resistance to ultraviolet of rubber related geosynthetics showed no visible alteration.

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Elastomeric High Barrier Materials for Vehicle (고차단성 자동차 부품용 고무소재)

  • Kim, Jin-Kuk
    • Elastomers and Composites
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    • v.46 no.1
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    • pp.2-9
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    • 2011
  • Permeability to gases and vapors is an important function in tires, rubber tubes and diaphragms. It mainly depends on the rubber material. Generally, permeability increases in the following order: silicone rubber > NR > EPDM > SBR > NBR > FPM > ECO > IIR. And, for an elastomer permeability is also very much dependent on compounding. Many research works are reported in the area of gas permeability for formed rubber,$^{1-7}$ however, few studies are found for unformed elastomer products. Incorporation of nano-particles, use of thermoplastic elastomers and applying high barrier multilayer coatings are the main approaches to obtain a high barrier elastomeric product. In this paper, barrier article for vehicle is introduced.

Comparative study on carboxylated styrene butadiene rubber composites reinforced by hybrid fillers of rice bran carbon and graphite carbon

  • Fan, Yuan;Li, Qingyuan;Li, Xiangxu;Lee, Dam hee;Cho, Ur Ryong
    • Carbon letters
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    • v.27
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    • pp.72-80
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    • 2018
  • In the present work, a comparative study of the mechanical behavior of two series of elastomeric composites, based on carboxylated styrene butadiene rubber (X-SBR) and reinforced with rice bran carbon (RBC) and graphite, is reported. Hybrid composites of X-SBR filled with RBC-graphite were also investigated in terms of the cure characteristics, hardness, tensile properties, abrasion resistance, and swelling. It was observed that the cure times decreased with the incorporation of a carbon filler whereas the torque difference, tensile strength, tensile modulus, hardness, and swelling resistance increased compared to the neat X-SBR revealing a favorable characteristic of crosslinking. Dynamic rheological analysis showed that the G' values of the composites, upon the addition of RBC-graphite, were changed to some extent. This demonstrates that the presence of a strongly developed network of fillers will ensure a reinforcing characteristic in a polymer matrix.

Surface Modification of Matrix and filler for Ultra High Density Elastomeric Material (초 고비중 탄성체 개발을 위한 매트릭스 탄성체 표면개질 및 충전제 제어기술 기초연구)

  • Chung, K.;Lee, D.;Yang, K.;Lee, W.;Hong, C.
    • Elastomers and Composites
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    • v.40 no.2
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    • pp.93-103
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    • 2005
  • In this study, surface treatment of the elastomeric matrix was investigated to develop a substituting material for steel dynamic damper of automobile. The key technology is to get ultra high density elastomeric compound in order to substitute steel dynamic damper. The optimum matrix material(chloroprene rubber) and filler(metal powder) were selected for this. The several properties of elastomeric compound were examined. According to the results, the $t_{s2}$ of filled elastomeric compound was decreased with increasing the filler loading whereas the $t_{90}$ was increased. Also, tensile strength and rebound resilience were decreased with filler loading. To solve the problem of high filler loading, the photo grafting technique was employed on elastomeric matrix. The degree of grafting was determined by FTIR-ATR. Also, the filler surface was modified by chemical etching and the surface morphology was examine by SEM. After chemical treatment of filler, the particle size analyzer was used to examined the particle size, size distribution, and morphology of the modified filler.