• Title/Summary/Keyword: reactive epoxy

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Preparation of Epoxidized Soft Terpolymers and Their Reactive Compatibilizing Effects on PP/EVOH Blends

  • Kim, Jung Soo;Jeon, Dong Gyu;Jang, Ji Hoon;Kim, Jin Hoon;Kim, Ki Bum;Yang, Hong Joo;Park, Jun Sung;Lee, Youn Suk;Kim, Dong Hyun
    • Elastomers and Composites
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    • v.50 no.3
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    • pp.189-195
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    • 2015
  • In this study, we prepared epoxidized poly ethylene-ter-1-decene-ter-divinylbenzene (Epo-PEHV) as a reactive compatibilizer to prevent phase separation phenomenon which occurs upon blending polypropylene (PP) and ethylene-vinyl alcohol copolymer (EVOH). Firstly, PEHV was prepared under high catalyst activity according to content of catalyst and cocatalyst. After then, we modified vinyl group of the terpolymer with epoxy group. We observed that the terpolymer was successfully epoxidized by 1H-NMR and FT-IR analysis. The Epo-PEHV was added by 2, 5, 10% in PP/EVOH blends. The morphologies and mechanical properties of PP/Epo-PEHV/EVOH blends were analyzed by SEM and UTM, respectively. Epo-PEHV enhanced the interfacial adhesion of PP and EVOH blends.

Synthesis of Poly(Styrene-co-GMA) and its Application as in situ Reactive Compatabilizer (Poly(Styrene-co-GMA)의 합성과 in situ Reactive Compatabilizer 로서의 응용)

  • Kim, Ju-Young;Suh, Kyung-Do
    • Applied Chemistry for Engineering
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    • v.3 no.3
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    • pp.499-506
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    • 1992
  • Copolymer of Styrene and GMA(glycidyl methachylate), having reactive ratios of $r_1=0.53$, $r_2=0.44$, was synthesized in dioxane using AIBN as free radical initiator. Followed by the reaction of ethylene diamine with copolymer PGS, amine groups were introduced to the PGS(NPGS). The composition of copolymer was determined by elemental analyzer. Poly(glycidyl methacrylate) (PGMA) was obtained in benzene using AIBN as free radical initiator. The NPGS-PGMA blend of 50/50 composition was prepared by mixing these polymers in THF at $65^{\circ}C$. Glass transition temperature (Tg) of NPGS-PGMA blend was measured by DSC. The blend showed a single Tg. Accordingly, it was clear that the NPGS was compatible with PGMA. An intermolecular reaction between amine groups of NPGS and epoxy groups of PGMA imparts compatibility in the NPGS-PGMA blend. When the NPGS-PGMA blend was added to the incompatible PS-PGMA blend, PS-PGMA blend showed Tg change. Scanning Electron Micrograph(SEM) showed a fine morphology in this blend. Consequently, it was apparent that the NPGS-PGMA blend acted as a compatibilizer for the PS-PGMA blend.

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Synthesis and Characterization of UV-curable Aliphatic Epoxy Acrylate (자외선 경화형 지방족 에폭시 아크릴레이트의 합성 및 특성분석)

  • Kim, Young Chul;Lee, Byung-Hoon
    • Journal of Adhesion and Interface
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    • v.10 no.4
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    • pp.191-198
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    • 2009
  • UV-curable aliphatic epoxy acrylates were prepared by the reaction of glycerol diglycidyl ether (GDE) with 2-carboxyethyl acrylate (2-CEA) or 2-hydroxyethyl acrylate (2-HEA). The structures of the epoxy acrylates were characterized by FT-IR, $^1H$-NMR, and $^{13}C$-NMR and the yield was obtained by prep-LC. The UV- and the thermal-curing behaviors of the product were investigated using photo-DSC and DSC, respectively. The reactivity of 2-CEA was higher than 2-HEA and the yield of the product (GEA-C) which was prepared using 2-CEA was about 83%. The maximum UV-curing time ($T_{max}$) of the GEA-C contained non-reactive components and by-product was about 10 seconds. The GEA-C showed low color difference (${\Delta}E^*$), low viscosity, and good thermal stability - its value was 2.51, 192 cps, and $299^{\circ}C$ (at 5% weight loss), respectively. The activation energies ($E_a$) of thermal-curing reaction calculated from Kissinger and Ozawa-Flynn-Wall method were 91~92 kJ/mol.

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Foam Application for Water and Oil Repellent Finishes (거품을 이용한 발수 발유가공)

  • 이정민;배기서;노덕길;김병미;이성애
    • Textile Coloration and Finishing
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    • v.5 no.2
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    • pp.125-133
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    • 1993
  • This study was to investigate the application of foam finishing technology (FFT) for the silicone finishing of cotton fabrics and the tluorochemical finishing of polyester fabrics. The repellency properties, soil resistance properties and selected physical properties were demonstrated and compared the foam finishing with the conventional padding application. Amino-funetional silicone prorided better durability than epoxy-functional silicone and conventional reactive silicone after three launderings. Foam finishing fabrics improved stiffness but showed lower or equivalent water and oil repellency properties, soil resistance properties, tearing strength and abrasion resistance than those of the fabrics treated by conventional padding process. But, it was evident that the foam application of silicone and fluorochemical finishes to the fabrics were feasible.

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Fabrication of a wavelength division multiplexer based on the polymeric arrayed-waveguide grating (폴리머 광도파로열을 이용한 파장 분할 다중화기의 제작)

  • 오태원;이원영;신상영
    • Journal of the Korean Institute of Telematics and Electronics D
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    • v.34D no.11
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    • pp.70-75
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    • 1997
  • a wavelength division multiplexer based on a polymeric arrayed-waveguide grating has been designed and fabricated. A 4-channel multiplexer with a spacing of 3.2 nm is designe dby using te 2-dimensional beam propagation method. A UV-curable epoxy, NOA73, is used for the core layer, and a passive polymer, PMMA, for the cladding layer. The polymer waveguides are fabricated by the reactive ion etching method and their optical properties are characterized. The fabricted device has a center wavelength of 1548.3 nm, and the wavelength spacing between the channels is 3.2nm. The measured crosstalk is better than -18dB.

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Photoelectrochemical Degradation of Perchlorate Ions by TiO2 (산화티탄의 광전기화학 특성을 이용한 퍼클로레이트 이온 제거)

  • Min, Hyung-Seob;Lee, Jeon-Kook
    • Korean Journal of Materials Research
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    • v.18 no.8
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    • pp.432-437
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    • 2008
  • Titanium oxide films and powders are attached onto carbon cloths via RF reactive sputtering and an epoxy resin mixture, respectively. $TiO_2$/carbon composite materials were used to investigate the photoelectrochemical degradation of perchlorate ions in water. The energy band gaps of the RF-sputtered $TiO_2$ thin films ranged from 3.35-3.44 eV. A photocurrent of the powdered $TiO_2$ as illuminated by ultra-violet light for 30 min. was $2.79\;mA/cm^2$. Perchlorate ions in water were shown to be degradable by a UV-illuminated $TiO_2$ powder/carbon/Nafion/carbon composite.

Design and fabrication of the $1.3/1.55\mum$ WDM coupler with the PSG waveguide films (PSG 광도파박막을 이용한 $1.3/1.55\mum$ WDM coupler의 설계 및 제작)

  • 전영윤;김한수;이용태;이형종
    • Korean Journal of Optics and Photonics
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    • v.6 no.4
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    • pp.310-316
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    • 1995
  • We designed the $1.3/1.55\mum$ WDM directional coupler and its coupling length was calculated with the variation of the two waveguide's core separation and other variables by the Fourier transformed scalar wave equation. We deposited the PSG films for optical waveguide by low pressure chemical vapor deposition and fabricated the WDM coupler using the laser lithography and $CF_4/O_2$ reactive ion etching process. A V -groove which was made to support and fix the optical fiber is fabricated on Si substrate by chemical etching. The WDM coupler and the V-groove are connected using UV curing epoxy. We found that propagation mode of each port of WDM coupler is single mode and maximum extinction ratio between two out ports is 6 dB for $1.3.\mum$, and 12 dB for $1.55\mum$. /TEX>.

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Cure Konetics and Mechanism of DGEBA-MDA-Malononitrile System (Malononitrile로 개질된 DGEBA-MDA계의 경화반응 속도론 및 반응 메카니즘)

  • Im, Seong-Su;Jo, Seong-U;Yu, Hui-Yeol;Sim, Mi-Ja;Kim, Sang-Uk
    • Korean Journal of Materials Research
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    • v.3 no.3
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    • pp.215-222
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    • 1993
  • Malononitrile(MN) as a reactive additive was added to Diglycidyl ether of bisphenol A (DGEBA)/Methylene dianiline (MDA) system in order to modify a thermosetting epoxy resin. Cure ki. netics and cure mechanism of this modified system were investigated by using DSC(differential scanning calorimetry) and FT-IR(fourier transform infrared spectrometry). Cure kinetics gave an information that the DGEBA/MDA system modified with MN should cure at over $110^{\circ}C$ after curing at about $80^{\circ}C$ for the complete curing. The activation energy of the first cure was nearly constant and that of the second cure was increased as the MN content was increased. Cure mechanism for the system was investigated with the samples cured every $30^{\circ}C$, from $80^{\circ}C$ to $170^{\circ}C$, for Ihr. It was known that the cure reactions of the epoxy-diamine system were composed of PA -E, SA - E and E-OH reactions. Beside these three reactions, in the DGEBA/MDA/MN system PA-CN and CN-OH reaction was found.

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Styrene-free Synthesis of Flame-retardant Vinyl Ester Resin Films for Hot-melt Prepreg Process (핫멜트 프리프레그 공정용 난연성 비닐에스터 수지 필름의 무 스티렌 합성)

  • Jiseon, Kang;Minji, Kim;Mongyoung, Huh;Seok Il, Yun
    • Composites Research
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    • v.35 no.6
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    • pp.412-418
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    • 2022
  • Flame-retardant vinyl ester (VE) resin films were developed from the mixtures of brominated and non-brominated epoxy resins via esterification with methacrylic acid without reactive diluents. The films were used to fabricate carbon fiber (CF) prepregs via a hot melt impregnation process. The viscosity of VE resins suitable for film production was optimized by mixing low-viscosity bisphenol-A and high-viscosity brominated bisphenol-A epoxy precursors. Increasing the bromine content of the cured VE resin further increased the limited oxygen index (LOI) (39%), storage modulus (2.4 GPa) at 25℃ and residual carbonization (16.1%) values compared to non-brominated VE. Manual layup of as-prepared VE prepregs with subsequent curing led to the successful fabrication of CF-reinforced composites with high tensile and flexural strength. The results from the study hold high promise for a styrene-free, environmentally friendly VE composite process in the future.

Cure Reaction of Epoxy Resin System with MN/HQ (MN/HQ가 첨가된 에폭시 수지계의 경화반응 연구)

  • Chun, In-Sook;Shim, Mi-Ja;Kim, Sang-Wook
    • Applied Chemistry for Engineering
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    • v.5 no.6
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    • pp.967-974
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    • 1994
  • We studied the cure kinetics of the DGEBA(Diglycidyl ether of bisphenol A)/MDA(4, 4' -methylene dianiline)/MN(Malononitrile)/HQ(Hydroquinone) system by Barrett method and Integral method with dynamic runs of differential scanning calorimetry(DSC). Kinetic parameters such as activation energy and pre-exponential factor were obtained and reaction order was estimated roughly supposing that present system was adjusted to nth order reaction. The MN(Malononitrile) was introduced as a chain extender and HQ(Hydroquinone) as a reactive accelerator or catalyst.

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