• Title/Summary/Keyword: Resin Composition

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Improved Thermal, Structural and Electrical Properties of Elastic-Epoxy Blends System

  • Lee, Kyoung-Yong;Lee, Kwan-Woo;Choi, Yong-Sung;Park, Dae-Hee
    • KIEE International Transactions on Electrophysics and Applications
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    • v.4C no.5
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    • pp.230-235
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    • 2004
  • In this paper, epoxy elasticity factors were investigated by TMA (Thermomechanical Analysis), DMTA (Dynamic Mechanical Thermal Analysis) and FESEM (Field Emission Scanning Electron Microscope) to improve toughness and reduce brittleness of existing epoxy resin. Dumbbell shaped specimens were made and tested at rates of 0, 20 and 35phr (part per hundred resins). TMA temperatures ranged from -2$0^{\circ}C$ to 20$0^{\circ}C$. Tg (glass transition temperature) of elastic epoxy was measured by thermal analysis. Also investigated were thermal expansion coefficient ($\alpha$), modulus and Tan$\delta$ (loss factor). And we analyzed structure through FESEM, could find elastic-factors of elastic epoxy that is not existing-epoxy. In addition, we measured permittivity and Tan$\delta$ for investigation of the electrical properties of elastic epoxy. Permittivity and Tan$\delta$ depend on elastomer composition. Namely, permittivity and Tan$\delta$ increase according to the elastomer contents. For experimental analysis results, 20phr was considered an excellent specimen.

The Toughness of Polyurethane and Epoxy Resins IPNs (폴리우레탄-에폭시 IPNs의 강인성)

  • Kim, Jong Seok;Hong, Suk Pyo
    • Applied Chemistry for Engineering
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    • v.9 no.3
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    • pp.445-450
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    • 1998
  • Interpenetrating polymer networks(IPNs) were prepared from castor oil-type polyurethanes(PUs) and epoxy resin. Two types of PU were prepared by using polypropylene ether glycol(PPG) as a chain extending agent and caster oil(CO) as a crosslinking agent. COPU/epoxy simultaneous interpenetrating polymer networks(SINs) based on CO had a better compatibility over the all composition than PPGPU/epoxy SINs based on PPG. The flexural strength of all PPGPU/epoxy SINs was decreased with decreasing entanglement of networks. COPU/epoxy SINs showed the higher fracture toughness and mechanial properties than the PPGPU/epoxy SINs. Fracture surfaces of all of the SINs showed the localized shear deformation and crack deflection rather than generation of stress whitening associated with the cavitation.

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Preparation and Super-Water-Absorbency of Poly(sodium acrylate-co-acrylamide-co-2-hydroxyethyl acrylate) (Poly(sodium acrylate-co-acrylamide-co-2-hydroxyethyl acrylate)의 제조와 고흡수 특성)

  • Zhang Yuhong;Deng Min;He Peixin
    • Polymer(Korea)
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    • v.30 no.4
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    • pp.286-292
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    • 2006
  • Super water-absorbent resins were prepared by inverse suspension copolymerization of sodium acrylate, acrylamide and 2-hydroxyethyl acrylate using N, N'-methylene-bis-acrylamide as cross-linker. For the suspension copolymerization, monohexadecyl phosphate was employed as the dispersing agent, cyclohexane as the dispersing medium and potassium persulfate as the initiator. The dependence of water-absorption capacity on the amount of crosslinking agent, oil/water ratio, degree of neutralization and the composition of the copolymer were systematically investigated. Furthermore, the swelling kinetics of the super water-absorbent copolymer was carried out. The absorption of the resins is more than 1800 g/g for deionized water and 100 g/g for 0.9% NaCl solution, respectively. The copolymers showed an increased salt resistance and enhanced water retention of soil.

Characterization of Carbon Composite Bipolar Plates far Polymer Electrolyte Membrane Fuel Cells (고분자 전해질 연료전지용 탄소 복합체 Bipolar Plates의 기체 투과 특성 연구)

  • Hong Seong Uk;Kim Hyun Seon;Choi Won Seok;Kim Jeong Heon
    • Membrane Journal
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    • v.15 no.2
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    • pp.141-146
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    • 2005
  • In this study, carbon composites were prepared using carbon graphite, thermoset resin, and carbon black. Oxygen permeability was measured using the continuous flow gas permeation analyzer as a function of composition and processing conditions. The experimental results showed that the oxygen permeability increased as the carbon black content increased, whereas the oxygen permeability decreased as the pressing time increased. The oxygen permeability was not affected by the processing pressure.

Influence of Heating Rate and Temperature on Carbon Structure and Porosity of Activated Carbon Spheres from Resole-type Phenolic Beads

  • Singh, Arjun;Lal, Darshan
    • Carbon letters
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    • v.10 no.3
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    • pp.181-189
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    • 2009
  • Activated carbon spheres (ACS) were prepared at different heating rates by carbonization of the resole-type phenolic beads (PB) at $950^{\circ}C$ in $N_2$ atmosphere followed by activation of the resultant char at different temperatures for 5 h in $CO_2$ atmosphere. Influence of heating rate on porosity and temperature on carbon structure and porosity of ACS were investigated. Effect of heating rate and temperature on porosity of ACS was also studied from adsorption isotherms of nitrogen at 77 K using BET method. The results revealed that ACS have exhibited a BET surface area and pore volume greater than $2260\;m^2/g$ and $1.63\;cm^3/g$ respectively. The structural characteristics variation of ACS with different temperature was studied using Raman spectroscopy. The results exhibited that amount of disorganized carbon affects both the pore structure and adsorption properties of ACS. ACS were also evaluated for structural information using Fourier Transform Infrared (FTIR) Spectroscopy. ACS were evaluated for chemical composition using CHNS analysis. The ACS prepared different temperatures became more carbonaceous material compared to carbonized material. ACS have possessed well-developed pores structure which were verified by Scanning Electron Microscopy (SEM). SEM micrographs also exhibited that ACS have possessed well-developed micro- and meso-pores structure and the pore size of ACS increased with increasing activation temperature.

Preparation and Characterization of Polyurethane Emulsion Modified with Halogen Compound (할로겐 변성 폴리우레탄 에멀젼의 제조 및 특성연구)

  • Lee, Young-Kyu;Cho, Sun-Young;Park, Hong-Soo;Wu, Jong-Pyo
    • Journal of the Korean Applied Science and Technology
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    • v.18 no.3
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    • pp.241-247
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    • 2001
  • Aqueous urethane dispersion resin begins to assume commercial importance due to increasing environmental awareness of VOC in coating industry. Moreover there have been strong industrial needs for the development of reactive-type polyurethane flame retardant coatings. In this study, chlorinated polyester polyols were synthesized by two step polycondensation reaction using mono chloroacetic acid, adipic acid, trimethylol propane, and 1,4-butanediol. In the next step polyurethane dispersion was prepared using these chlorinated polyester polyols and isophorone diisocyanate with dimethylol propionic acid(DMPA) and trimethylamine. The structure of chlorinated polyol was characterized by GPC, FT-IR and NMR. Particle size and its distribution were examined in terms of various dispersion parameters including molecular weight and composition of polyol, amount of DMPA, and NCO/OH ratio, etc. The effect of chlorinated polyols on flammability was also evaluated.

Spectrophotometric Determination of Platinum (IV) with 2-Oximino-1-indanone (2-Oximino-1-indanone을 이용한 Pt(IV) ion의 정량에 관한 연구)

  • 김정균;유미경;원미숙;심윤보;고영심
    • YAKHAK HOEJI
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    • v.28 no.2
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    • pp.61-67
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    • 1984
  • A method is described for the spectrophotometric determination of platinum (IV) with 2-oximino-1-indanone based on solvent extraction of Pt:2-oximino-1-indanone complex. The 2-oximino-1-indanone reacted with Pt(IV) to form a dark-orange complex which shows a characterisic maximum absorption at 342nm. The optimum PH for the platinum extraction lies between 5.4~8.0. Beer's law obeys up to 0.98-16.3ppm of platinum (IV) and the molar absorption coefficient is $1.06{\times}10^{-4}L.mol^{-1}.cm^{-1}$. The relative standard deviation of the method was $\times2.1%$. The composition of the complex is estimated to be Pt : In= 1 : 1, by the mole ratio method and ion exchange resin experiment. The optimum condition for the determination of platinum has been studied in detail. The 2-oximin-1-indanone is found to be a selectivereagent for the determination of platinum, since the synthesixed 2-oximino-1-indanone did not react with other metals such as cobalt, cadmium, copper, manganese nickel, iron, lead and zinc, to form the complex. In this studies, we have also clarified Sindhwani and Singh's spectrophotometric determination data of various metals with acenaphthenequinone monooxime (Talanta 20,248, 1973), whose results were not correct.

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Durable Press Finish of Cotton Fabric Using Malic Acid as a Crosslinker

  • Kim, Byung-Hak;Jang, Jinho;Ko, Sohk-Won
    • Fibers and Polymers
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    • v.1 no.2
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    • pp.116-121
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    • 2000
  • It has been considered that malic acid, $\alpha$-hydroky succinic acid, could not form crosslinks in the cellulosic materials unless activated by other polycarboxylic acids such as butanetetracarboxylic acid or citric acid because there are only two carboxylic acids per molecule available fur the formation of one anhydride intermediate. However we found that the dicarboxylic malic acid with sodium hypophosphite catalyst without the addition of other crosslinkers was able to improve wrinkle resistance of cotton up to $294^{\circ}$(dry WRA) and $285^{\circ}$ (wet WRA), which is a measure of crosslinking level in cotton. $^1$H FT-NMR, FT-IR and GPC analysis indicated the in-situ formation of an trimeric $\alpha$, $\beta$-rnalic acid with a composition of 1:3 through the esterification between hydroxyl group and one of carboxylic groups in malic acid during curing. The crosslinking of cotton was attributed to the trimeric $\alpha$, $\beta$-malic acid, a tetracarboxylic acid, which can form two anhydride rings during curing. The influence of crosslinking conditions such as concentrations of malic acid and catalyst, pH of the formulation bath, and curing temperature were investigated in terms of imparted wrinkle resistance and whiteness. The addition of reactive polyurethane resin in the formulation slightly increased the mechanical strength retention of crosslinked fabric coupled with additional increase in wrinkle resistance.

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Thermal stabilities and dynamic mechanical properties of dielectric materials for next generation PCB

  • Cho, Jae-Choon;Lee, Hya-Young;Lim, Sung-Taek;Park, Moon-Su;Lee, Keun-Yong;Oh, Jun-Lok
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2008.06a
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    • pp.253-253
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    • 2008
  • Recently, high performance microelectronic devices are designed in multi-layer structure in order to make dense wiring of metal conductors in compact size. For making dense wiring of metal conductors, we investigated CTE and peel strength of dielectric materials for next generation PCB. It is an object of this research to develop an epoxy resin composition for an interlayer insulating material exhibiting low CTE and high peel strengnth and making an insulating layer thinner.

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Improvement of Electrical and Thermal Characteristics of Nano-Micro Epoxy Composite

  • Cho, Sung-Hoon;Kim, Yu-Min;Kwon, Jung-Hun;Lim, Kee-Joe;Jung, Eui-Hwan;Lee, Hung-Kyu;Shin, Pan-Seok
    • Transactions on Electrical and Electronic Materials
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    • v.12 no.4
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    • pp.160-163
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    • 2011
  • Polymer nanocomposite has been attracting more attention as a new insulation material because homogeneous dispersion of nano-sized inorganic fillers can improve various properties significantly. In this paper, various kinds of epoxy-based nanocomposites were made, and the AC breakdown strengths of Nano filler and micro-$SiO_2$ filler mixtures of epoxy-based composites were analyzed using sphere-to-sphere electrodes. Moreover, nano- and microfiller combinations were investigated as an approach to practical application of nanocomposite insulation materials. Its composition ratio was 100 (resin):82 (hardener):1.5 (accelerator). AC breakdown tests were performed at room temperature ($25^{\circ}C$), $80^{\circ}C$, and $100^{\circ}C$ in the vicinity of $T_g$ ($90^{\circ}C$). Thermal conductivity was measured using TC-30.