• Title/Summary/Keyword: 비닐에스테르 수지

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Effect of Diffusion on the Interfacial Adhesion of Poly(hydroxy ether) Coated Caron Fibers (계면확산에 의한 Poly(hydroxy ether) 코팅된 탄소섬유의 계면접착력 변화 연구)

  • 강현민;윤태호
    • Composites Research
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    • v.12 no.6
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    • pp.15-21
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    • 1999
  • Carbon fibers were coated with carboxy modified poly(hydroxy ether)(C-PHE, water dispersed), water soluble polymers poly(hydroxy ether ethanol amine)(PHEA) or water insoluble poly(hydroxy ether)(PHE). Interfacial shear strength of polymer coated carbon fibers was measured by micro-droplet tests with vinyl ester resin, and approximately 30 samples were tested. The interfacial adhesion of poly-mers to carbon fibers was also evaluated, and diffusion behavior of polymer films in vinyl ester resin was investigated. The carbon fibers after testing and diffusion samples were analysed by SEM in order to understand adhesion mechanism. Interfacial shear strength of carbon fibers was enhanced by the coating of PHE and C-PHE which have good or marginal solubility in vinyl ester resin, respectively, but not by the coating of PHEA possibly due to the poor solubility in vinyl ester resin.

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Physical Properties of Permeable Polymer Concrete (투수성 폴리머 콘크리트의 물리적 성질)

  • 최재진;황의환
    • Journal of the Korea Concrete Institute
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    • v.14 no.1
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    • pp.41-48
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    • 2002
  • In this paper, permeable polymer concretes with unsaturated polyester or vinylester resin content from 5 to 8 weight %, resin-filler ratio of 1 : 1, sand content from 0 to 15 weight % and crushed stone of size 2.5∼10 mm were prepared, and tested for compressive strength, flexural strength and water permeability. The effects of the resin and sand contents on the properties of permeable polymer concrete were discussed. It is concluded from the test results that increase in the strength and decrease in the coefficient of permeability of the permeable polymer concrete arc clearly observed with increasing the resin and sand contents. The permeable polymer concrete showed compressive strength in the range of 170 to 350 kgf/$\textrm{cm}^2$ and flexural strength in the range of 40 to 90 kgf/$\textrm{cm}^2$ at coefficient of permeability from 0.1 to 1.0 cm/sec in this experiment.

Investigation on Mechanical Properties of Flax/Vinyl Ester Natural Fiber Composite (아마/비닐 에스테르 자연 섬유 복합재료의 기계적 특성 분석 연구)

  • Park, Hyunbum;Kong, Changduk;Lee, Jeonghwan;Kim, Ingwon;Lee, Hoyeon
    • Composites Research
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    • v.27 no.1
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    • pp.19-24
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    • 2014
  • In this study, an investigation on mechanical properties of flax/vinyl ester natural fiber composite was performed as a precedent study on the design of eco-friendly structure using flax/vinyl ester composite. Vacuum Assisted Resin Transfer Molding(VARTM) manufacturing method was adopted for manufacturing the flax fiber composite specimen. The mechanical properties of the manufactured flax composites were compared with flax composite data cited from some references. Based on this, the experimental data showed that the flax/vinyl ester composite has some advantages when it is applied to environment-friendly structure.

Decomposition of Compost Bag Using Polyester Resin (폴리에스테르 수지를 이용한 콤포스트 백 분해에 관한 연구)

  • Lee, Keon Joo
    • Journal of the Korea Organic Resources Recycling Association
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    • v.13 no.3
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    • pp.97-104
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    • 2005
  • In this study, the change of water content, pH, and combustion weight on the decomposition of poly ester vinyl and high density poly ethylene were examined. The poly ester vinyl was degraded by microorganism in food wastes for 30 days, while high density poly ethylene vinyl was not degraded. Also, the poly ester vinyl was rapidly degraded after the 10 days of operation and its weight was decreased. In the combustion reaction between $300^{\circ}C$ and $600^{\circ}C$, complete combustion was performed. Due to the degradation of poly ester vinyl by microorganism in food waste, the pH was increased from 4.26 to 7.6. During of 60 days operation, poly ester vinyl was degraded over 90%.

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A Study on Synthesis Catalysts for Vinylester Resin (비닐에스테르 수지의 합성촉매에 관한 연구)

  • Hong, Suk-Pyo;Choi, Sang-goo
    • Applied Chemistry for Engineering
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    • v.2 no.3
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    • pp.229-237
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    • 1991
  • Vinylester was syntheszed in the presence of amine and metal catalysts, such as triethylamine(TEA), triethylbenzyl ammonium chloride (TEBAC), cetyltrimethyl ammonium bromide (CTMAB), chromium acety] acetate (CAA), and triphenylantimony (TPA). Apropriate use of amine and organometal catalysts were 1.7~2.2 % (Wt. %), 2.5~3.1 % (Wt %) of charged methacrylic acid (MAA) in respect of reactivity, gel-time, and storage stability. The Order of reactivity was TEA>TEBAC>CTMAB>CAA>TPA. Temperature independence of catalyst showed more large deviation above $110^{\circ}C$. Storage stability could be improved without delay of gel-time by adding TPA in 2.0 % (Wt %) of charged MAA after synthesis.

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Mechanical Properties of Three-dimensional Glass Fabric-reinforced Vinyl Ester Matrix Composites (삼차원 유리직물 강화 비닐에스테르 복합재의 기계적 특성)

  • Park, Won-Bae;Park, Soo-Jin;Lee, Jae-Rock
    • Applied Chemistry for Engineering
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    • v.9 no.5
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    • pp.715-718
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    • 1998
  • In this work, bisphenol type vinyl ester was impregnated into the three-dimensional glass fabrics fabricated from different thickness changes. Their mechanical properties of the specimens have been investigated by three-point bending and flatwise compression tests. Also, interlaminar shear strength (ILSS) has been determined through short-beam test for the evaluation of interfacial adhesion at interfaces between fibers and matrix of the composites. The effect of thickness changes in three-dimensional glass fabric-reinforced composites have been described in this work.

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Influence of Molecular Weight and Structure on the Physical Properties of the Vinylester Resin (비닐에스테르 수지의 구조 및 분자량이 물성에 미치는 영향)

  • Hong, Suk-Pyo;Choi, Sang-Goo;You, Kil-Sang
    • Applied Chemistry for Engineering
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    • v.3 no.2
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    • pp.318-326
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    • 1992
  • Vinylester resin was synthesized by reacting epoxy resin with MAA(methacrylic acid) at a equivalent ratio of 1.1/1.0 in the presence of N,N dimethyl benzylamine. Low molecular weight epoxy(DER 331) was used together with higher molecular weight epoxy(DER 662, DER 664) and a novolac epoxy(DEN 439), and the amount of DER 331 was not over 50% of the total epoxy components. Viscosity, cure time and mechanical properties of the vinylester resin were profoundly influenced by the quantity of reacted MAA, and the structure and molecular weight of the epoxy resin. Tensile and flexural strength appeared to be the greatest when DER 331 fraction was 30~40%.

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Structural Performance of Reinforced Concrete Shear Columns Strengthened with Sprayed Fiber Reinforced Polymers (Sprayed FRP로 보강된 철근 콘크리트 전단기둥의 보강성능 평가)

  • Lee, Kang Seok;Byeon, In Hee;Lee, Moon Sung
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.11 no.3
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    • pp.132-142
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    • 2007
  • In this study, a structural performance of R/C columns controlled by shear, strengthened with Sprayed FRP, was investigated. For this purpose, six 2/3-scaled column specimens were designed and tested by the pseudo-static reversed cyclic load under a constant axial load, which is 10% of the nominal axial strength of the column. Four specimens were strengthened by Sprayed FRP with different combinations of short fibers (carbon or glass) and resins (epoxy or vinyl ester). For comparison purpose, tests of a specimen strengthened with carbon fiber sheet (CFS) and a control specimen without strengthening were carried out, respectively. The result reveals that shear strengths and ductility capacities of columns strengthened with Sprayed FRP improved remarkably, compared to those of the control column, and the Sprayed FRP technique developed in this study is able to use the strengthening scheme of existing R/C columns.

Effect of Vinylic Monomers on Toughness of Unsaturated Polyester (불포화 폴리에스테르 수지의 강인성에 비닐계 단량체가 미치는 효과)

  • 이동호;정용균;최관영;김호겸;민경은;서관호;임정철;전일련
    • Polymer(Korea)
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    • v.25 no.3
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    • pp.375-384
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    • 2001
  • We investigated the change of mechanical properties of UP using mixture of SM with VAc or MA that have low glass transition temperature when polymerized instead of SM only for diluents of UP. In case of using mixture of SM/MA, it was elucidated that the toughness of UP was more improved than using SM only. But in case of SM/VAc, it was observed that the content of mixture could not affect on toughness. It was concluded that these results are caused by the effect of each diluents mixtures on stress-relaxation due to phase separation and on decrease glass transition temperature of UP is quite different from each other.

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Structural Design of Light Weight Natural Fiber Composites for Next Generation Automobile Bonnet (차세대 자동차 본넷용 친환경 경량화 자연섬유 복합재 구조 설계)

  • Park, Kilsu;Kong, Changduk;Park, Hyunbum
    • Composites Research
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    • v.28 no.2
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    • pp.46-51
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    • 2015
  • In this study, structural design and analysis of the automobile bonnet is performed. The flax/vinly ester composite material is applied for structural design. The Vacuum Assisted Resin Transfer Molding-Light (VARTML) manufacturing method is adopted for manufacturing the flax fiber composite bonnet. The VARTML is a manufacturing process that the resin is injected into the fly layered-up fibers enclosed by a rigid mold tool under vacuum. A series of flax/vinyl ester composite panels are manufactured, and several kinds of specimens cut out from the panels are tested to obtain mechanical performance data. Based on this, structural design of the automobile bonnet is performed.