• Title/Summary/Keyword: Epoxy Resin System

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Effect of $TiO_2$ Nanoparticle on the Mechanical and Thermal Properties of Epoxy Resin Composites (에폭시수지 복합재료의 기계적.열적 성질에 대한 $TiO_2$ 나노입자의 영향)

  • Moon, Y.J.;Choi, J.Y.;Kim, B.A.;Moon, C.K.
    • Journal of Power System Engineering
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    • v.14 no.4
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    • pp.68-75
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    • 2010
  • The effect of dispersion agent, the content and size of nanoparticle on the mechanical and thermal properties has been investigated in $TiO_2$ nanoparticle/epoxy resin composites(nanocomposites). The weight fraction of fabricated nanocomposites were 0, 1, 3, 5%, respectively. The glass transition temperature was lower than pure epoxy resin and decreased with the increasing of nanopaticle content. This is considered that the cross link of epoxy resin during solidification was hindered by the presence of nanoparticles. Nanocomposites of 3wt% content with dispersion agent showed the best tensile strength. The tensile strength of 20㎚ $TiO_2$ nanocomposites were higher than one of 200nm $TiO_2$ nanocomposites.

Curing Kinetics of Amine Terminated Polyetherimide/Epoxy Resin Blends and Its Application on the High Toughness Composites (Amine terminated polyetherimide/Epoxy 블렌드의 경화공정과 고강인성 복합재료에의 응용)

  • 김민영;김성호;이광기;김원호;안병현
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2001.10a
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    • pp.49-52
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    • 2001
  • The investigation of cure kinetics, morphology, and fracture toughness studies on epoxy resin/amine terminated PEI/Anhydride system were performed by differential scanning calorimetry and scanning electron microscopy. Modified autocatalystic kinetics model was applied by isothermal scan test. The fracture toughness for the neat epoxy resin was 2.15 MPa m0.5 and the fracture toughness was improved 45% as neat epoxy resin system. The generation of secondary phase of AT-PEI was observed and its size was grown up by increasing contents of PEI.

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Effects of GN Contents on Thermal Decomposition of Epoxy Resin System (GN 함량에 따른 에폭시 수지계의 열분해 특성)

  • 안현수;심미자;김상욱
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1997.11a
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    • pp.389-392
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    • 1997
  • Glutaronitrile(GN) was introduced to diglycidyl ether of bisphenol A(DGEBA)/ 4,4'-methylene dianiline(MDA) system to improve toughness. Effects of GN contents on thermal decomposition of epoxy resin system were investigated. To study the characteristics of thermal decomposition, thermo-gravimetric analysis(TGA) and Kissinger equation were used. Thermal degradation temperatures were about 365$^{\circ}C$ regardless of GN contents. Activation energies of thermal decomposition in epoxy resin system were almost constant below 10 phr and decreased above 15 phr.

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Mechanical Characteristics of CF Laminated Prepreg with UV-thermal Dual Curable Epoxy Resin (광·열경화형 수지를 이용한 탄소섬유 프리프레그의 물리적 특성)

  • Sim, Ji-hyun;Kim, Ji-hye;Park, Sung-min;Koo, Kwang-hoe;Jang, Key-wook;Bae, Jin-seok
    • Textile Coloration and Finishing
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    • v.29 no.1
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    • pp.37-44
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    • 2017
  • An issue of major concern in the utilization of laminated composites based epoxy resin is associated with the occurrence of delaminations or interlaminar cracks, which may be related to manufacturing defects or are induced in service by low-velocity impacts. A strong interfacial filament/brittle epoxy resin bonding can, however, be combined with the high fracture toughness of weak interfacial bonding, when the filaments are arranged to have alternate sections of shear stress. To improve this drawback of the epoxy resin, UV-thermal dual curable resin were developed. This paper presents UV-thermal dual curable resin which were prepared using epoxy acrylate oligomer, photoinitiators, a thermal-curing agent and thermoset epoxy resin. The UV curing behaviors and characteristics of UV-thermal dual curable epoxy resin were investigated using Photo-DSC, DMA and FTIR-ATR spectroscopy. The mechanical properties of UV-thermal dual curable epoxy resin impregnated CF prepreg by UV curable resin content were measured with Tensile, Flextural, ILSS and Sharpy impact test. The obtained results showed that UV curable resin content improves the epoxy toughness.

Cure Kinetics of Self-Extinguishing Epoxy Resin Systems with Charge Transfer Complex Type Latent Catalyst for Semiconductor Encapsulation (전하전이착체형 잠재성 촉매를 사용한 반도체 성형용 자소성 에폭시 수지 시스템의 경화 반응속도 연구)

  • Kim, Whan Gun
    • Journal of the Semiconductor & Display Technology
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    • v.13 no.4
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    • pp.27-32
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    • 2014
  • The cure properties of self-extinguishing epoxy resin systems with different charge transfer type latent catalysts were investigated, which are composed of YX4000H as a biphenyl epoxy resin, MEH-7800SS as a hardener, and charge transfer type latent catalysts. We designed and used five kinds of charge transfer type latent catalyst and compared to epoxy resin systems with Triphenylphosphine-Benzoquinone(TPP-BQ) as reference system. The cure kinetics of these systems were analyzed by differential scanning calorimetry with an isothermal approach, the kinetic parameters of all systems were reported in generalized kinetic equations with diffusion effects. The epoxy resin systems with Triphenylphosphine-Quinhydrone(TPP-QH), Triphenylphosphine-Benzanthrone(TPP-BT) and Triphenylphosphine-Anthrone(TPP-AT) as a charge transfer type latent catalyst showed a cure conversion rate of equal or higher rate than those with TPP-BQ. These systems with TPP-QH and Triphenylphosphine-Tetracyanoethylene(TPP-TCE) showed a critical cure reaction conversion of equal or higher conversion than those with TPP-BQ. The increases of cure conversion rates could be explained by the decrease of the activation energy of these epoxy resin systems. It can be considered that the increases of critical cure reaction conversion would be dependent on the crystallinity of the biphenyl epoxy resin systems.

Nanoparticle effect on the mechanical properties of polymer composites (에폭시수지의 물성에 미치는 나노입자의 영향)

  • Moon, Chang-Kwon;Kim, Bu-Ahn
    • Journal of Power System Engineering
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    • v.19 no.5
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    • pp.12-16
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    • 2015
  • $TiO_2$ nanoparticle can be used for the improvement of performance of the epoxy resin composites. In this study, the effect of the size of $TiO_2$ nanoparticle on the mechanical properties for the epoxy resin composites was investigated. The size of $TiO_2$ nanoparticle was easily controlled by heat treatment. The heat treatment of $TiO_2$ nanoparticle was conducted between $700^{\circ}C$ and $900^{\circ}C$. The obtained size of $TiO_2$ nanoparticle was 20 nm, 100 nm and 200 nm respectively. As the diameter of $TiO_2$ nanoparticle is smaller, the epoxy resin composite specimen showed higher tensile strength. It was also found that Vickers hardness of epoxy resin was increased by the addition of $TiO_2$ nanoparticle. But the size of $TiO_2$ nanoparticle did not strongly affected to the Vickers hardness of this material. The fracture surface of epoxy resin showed clear difference by the size of $TiO_2$ nanoparticlet.

Thermoinitiated Cationic Polymerization of Epoxy Resin by Sulfonium Salts for Latent Curing (Sulfonium 염에 의한 Epoxy 수지의 잠재성 경화형 열 개시 양이온 중합반응)

  • Kim, Sun Hee;Shin, Min Jae;Shin, Jae Sup
    • Journal of Adhesion and Interface
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    • v.13 no.2
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    • pp.53-57
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    • 2012
  • A latent curing system was necessary for the anisotropic conducting film (ACF), and a fast reaction system was also necessary to fast production. In this study, the benzylsulfonium salts were synthesized and were used as latent curing initiators for epoxy resin. These benzylsulfonium compounds exhibited a long shelf life with epoxy resin. The curing behaviors of an epoxy resin with these sulfonium salts were investigated using differential scanning calorimetry (DSC), and the curing times were determined at $150^{\circ}C$ using an indentation method.

Novel thermoplastic toughening agents in epoxy matrix for vacuum infusion process manufactured composites

  • Bae, Jin-Seok;Bae, Jihye;Woo, Heeju;Lee, Bumjae;Jeong, Euigyung
    • Carbon letters
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    • v.25
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    • pp.43-49
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    • 2018
  • This study suggests the novel thermoplastic toughening agent, which can be applied in the monomer forms without increasing the viscosity of the epoxy resin and polymerized during the resin curing. The diazide (p-BAB) and dialkyne (SPB) compounds are synthesized and mixed with the epoxy resin and the carbon fiber reinforced epoxy composites are prepared using vacuum infusion process (VIP). Then, flexural and drop weight tests are performed to evaluate the improvement in the toughness of the prepared composites to investigate the potential of the novel toughening agent. When 10 phr of p-BAB and SPB is added, the flexural properties are improved, maintaining the modulus as well as the toughness is improved. Even with a small amount of polytriazolesulfone polymerized, due to the filtering effect of the solid SPB by the layered carbon fabrics during the VIP, the toughening and strengthening effect were observed from the novel toughening agent, which could be added in monomer forms, p-BAB and SPB. This suggests that the novel toughening agent has a potential to be used for the composites prepared from viscosity sensitive process, such as resin transfer molding and VIP.

The Conduction Properties of Epoxy Resin Composition According to the Content Change of Spherical Hollow Type Silver (중공형 구형 은입자의 함량변화에 따른 에폭시 수지조성물의 전도특성 연구)

  • Kim, Whan Gun;Lim, Ryun Woo
    • Journal of the Semiconductor & Display Technology
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    • v.11 no.2
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    • pp.23-26
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    • 2012
  • The monodispersed polystyrene spheres were prepared by emulsion polymerization in aqueous alcohol system. They coated with silver by reduction of silver ion percolated on the surface of them. The spherical hollow type silver has been prepared by dissolving polystyrene with toluene. Epoxy resin compositions with spherical hollow type silver were manufactured, which were composed of a bisphenol F type epoxy resin (RE-304S), amine type hardener (Kayahard AA), and 1-benzyl 2-methyl imidazole (1B2MI) as catalyst. The electrical conductivity with silver content ratio were investigated after cure, the percolation threshold weight ratio for conductance in this epoxy resin system was obtained above the 70 wt% of silver.

A Study on the Mechanical Properties of Braid Composites for the Manufacture of Aircraft Stringer (항공기용 스트링거 제작을 위한 브레이드 복합재료의 물성에 관한 연구)

  • Eun, Jong Hyun;Lee, Joon Suck;Park, Seung Hwan;Kim, Dong Hyun;Chon, Jin Sung;Yoo, Ho Wook
    • Composites Research
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    • v.31 no.6
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    • pp.293-298
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    • 2018
  • In this paper, we have studied the physical properties of braided composites for use as aircraft stringers. Process variables such as drum winder speed, braid velocity, and mandrel diameter for $30^{\circ}$, $45^{\circ}$ and $60^{\circ}$ braid preforms were quantified and different epoxy resin types were applied to the braided preform using TGDDM, YD-128. Physical properties such as tensile strength and flexural strength of braided composites were investigated. Thermal properties and decomposition temperature of epoxy resin were investigated by TGA analysis. As a result, the lower the angle of the braid composites, the higher the tensile strength and the Flexural strength. The physical properties of braided composites fabricated using TGDDM epoxy resin were superior to the physical properties of braided composites fabricated using YD-128 epoxy resin. This is because the molecular weight of TGDDM epoxy resin was higher than that of YD-128 epoxy resin.