• Title, Summary, Keyword: 가교화

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Synthesis of Aminated GMA-DVB Copolymer and Their Adsorption Properties for Nitrate (아민화 GMA-DVB 공중합체의 합성과 질소 성분에 대한 흡착 특성)

  • 황택성;이선아;이면주
    • Polymer Korea
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    • v.25 no.3
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    • pp.311-317
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    • 2001
  • In this study, we synthesized bead-type GMA-DVB copolymer using glycidylmethacrylate (GMA) with high reactivity and hydrophilicity. Macrorecticular anion exchanger containing the trimethylammonium group were then prepared by amination with trimethylammonium chloride. We observed that the size of $NO_3^-$ is smaller than that of $SO_4^{2-}$ which disturb $NO_3^-$ removal in most of coexistent anions in ground water. Thus we investigated selective affinity for $NO_3^-$ and properties of individual ion exchangers with various DVB content. For each resins, we confirmed formation of copolymer by FT-IR spectrometer and investigated ion exchange capacity, swelling ratio, the amination yield and the effect with degree of crosslinking on adsorbability for nitrate. When amount of DVB is 4 wt%, amination yield, ion exchange capacity and swelling ratio was 384.3%, 3.25 meq/g and 77.1%, respectively. In these result, it can found that synthetic optimal condition is 4 wt% DVB content for monomer.

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Preparation of Pressure Sensitive Adhesive Using Reactive Polyurethane Resin and the Effect of Interfacial Crosslinking on the Adhesion Property (반응성 폴리우레탄 레진을 이용한 Pressure Sensitive Adhesive 제조 및 계면 가교 반응이 점착 물성에 미치는 영향)

  • Shin, Jin Sup;Kim, Ji Heon;Cheong, In Woo;Kim, Jung Hyun
    • Applied Chemistry for Engineering
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    • v.16 no.1
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    • pp.81-85
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    • 2005
  • Pressure sensitive adhesive (PSA) was prepared by semi-batch emulsion polymerization of acryl monomers in the presence of reactive and non-reactive carboxylated polyurethane resin (PUR). Effects of the PUR type, its content, and crosslinker feeding method on the adhesive properties of the PSA was investigated. In this experiment, the PSA prepared with the reactive PUR showed better adhesive property then the PSA with the non-reactive PUR. Especially, peel strength of the PSA, where acetoacetoxy ethyl methacrylate and 1,6-hexane diamine as crosslinkers were introduced, was dramatically enhanced in severe humidity condition due to the interfacial crosslinking.

ECO Characteristic of ATH - Filled XLPE Compound Composites (환경친화적 ATH - FILLED XLPE COMPOUND 특성 연구)

  • Jung, Young-Seub;Kim, Kyung-Yong;Han, Sien-Ho
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.44-48
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    • 2003
  • 할로겐 난연재료 및 고분자의 연소시 Dioxine의 문제점이 대두되고 있어 유럽국가를 중심으로 할로겐 난연제 사용을 규제하고 있다. 환경과 인체에 대한 안정성을 고려해서 저 유해 가스화, 저 발연화, 저 부식성, 리사이클링 등을 겸비한 제품의 개발로 관심이 모아지고 있는 실정이다. 본 연구에서는 환경친화적인 금속화합(수산화 알루미늄)을 사용하여 연소시 발생할 수 있는 난연성, 무독성, 소연성 등을 함량별로 확인하고 난연재가 증가할수록 취약한 기계적 물성 보완을 위해 moisture cure crosslikable 기술로 케이블절연 및 자켓 피복층 특성을 증가 시켰다. 그러나 수산화알루미늄 함량이 증가할수록 기계적 물성과 기타 특성도 감소하는 경향을 보이고 있어 최적의 난연제 조성함량이 약 130~150 phr정도에서 우수한 결과를 확인하였다. 또한 moisture cure agent는 전선압출 시 표면에 scorch 및 장기 압출에 영향을 주므로 약 1.5~2phr 범위에서 처방하는 것이 우수하다. 원료투입 후 mixing 공정 중에서는 온도관리가 매우 중요하므로 되도록 믹싱 온도를 $130^{\circ}C$ 이하를 유지해야한다. 온도는 수산화알루미늄의 분산성과 케이블 피복압출 시 표면에도 영향을 주기 때문이다 본 연구는 이런 작업방법을 통해 친환경 가교 난연콤파운드가 비(比) 가교된 제품에 비해 특성이 증가되는 것을 입증할 수 있었다.

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Wear Resistance of Crosslinked Ultra-high Molecular Weight Polyethylene (가교된 초고분자량 폴리에틸렌의 내마모성)

  • Im, Chae-Ik;Lee, Gwi-Jong;Jo, Jae-Yeong;Choe, Jae-Bong;Choe, Gwi-Won
    • Journal of Biomedical Engineering Research
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    • v.20 no.1
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    • pp.99-106
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    • 1999
  • Ultra-high molecular weight polyethylene (UHMWPE) was crosslinked in the melt state to enhance wear resistance, Dicumyl peroxide (DCP) and triallyl cyanurate (TAC) was used as a crosslinking agent and a promoter, respectively. With increasing amount of DCP and TAC used, gel content of crosslinked UHMWPE (XUMPE) increased, while the melting temperature, crystallizaiton temperature, crystallinity, and tensile properties decreased. The results of pin-on-disk wear test and ball-on-disk test with small applied load showed reduced wear volumes of XUMPE from that of the unmodified UHMWPE. As the wear mechanism effected in the experimental condition of this study was thought to be deformation rather than adhesion or fatigue, a new parameter, the ratio of maximum contact stress to yield stress, was proposed to correlate well with observed wear resistance. In ball-on-disk wear test with larger applied load, XUMPE showed higher wear volumes than that of the unmodified UHMWPE which were accompanied with increased friction coefficients and surface roughness of the wear tracks. When contact stress was well above yield stress, the failure of XUMPE, as well as deformation, was thought to be much accelerated.

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The Effects of a Chain Extending Agent and Crosslinking Agent on the Toughness of Castor Oil based Polyurethane-Epoxy IPNs (Castor Oil형 폴리우레탄-에폭시 IPNs에서 사슬연장제와 가교제의 영향에 의한 강인성)

  • Kim, Jong-Seok;Yang, Yeong-Seok
    • Applied Chemistry for Engineering
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    • v.10 no.5
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    • pp.639-643
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    • 1999
  • Interpenetrating polymer networks(IPNs) composed of castor oil(CO) polyurethane(PU) and epoxy resin were prepared by the simultaneous polymerization technique. Two types of PU were prepared using 1,4-butanediol(BD) and BD/trimethylolpropane(TMP) as a chain extending agent and crosslinking agent. The PU/epoxy based on BD as a chain extending agent showed more shift in the damping peak than PU/epoxy based on BD/TMP as the PU content was increased. BDPU/epoxy simultaneous interpenetrating polymer networks(SINs) had a better compatibility than BD/TMP-PU/epoxy SINs. For both systems, it was postulated that unique network formation of PU/epoxy SINs as a chain extending agent and crosslinking agent had occurred to a significant extent of phase mixing. The types of chain extender in the PU were found to be an important factor in determining the phase mixing of the IPNs. When the BD/TMP-PU reaction was faster than epoxy network, the extent of phase mixing was retarded by decreasing entanglement of networks. It was found that both PU/epoxy SINs provided enhanced flexural properties and fracture toughness, fracture surfaces of BDPU/epoxy and BD/TMP-PU/epoxy SINs showed the localized shear deformation and generation of stress whitening associated with the cavitation.

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Synthesis of Crosslinked Chitosan Phosphate and Its Metal Ion Adsorption Characteristics (I)-Crosslinking and Phosphorylation of Chitosan- (인산화 가교 키토산의 합성 및 금속이온 흡착 특성(I)-키토산의 가교 및 인산화 반응-)

  • 이종순;홍성일전동원
    • Textile Science and Engineering
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    • v.31 no.12
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    • pp.966-975
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    • 1994
  • Chitosan. a natural biodegradable polymer, was crosslinked with epichlorohydrin in alkaline condition and phosphorylated with P2O5 in methanesulfonic acid to use as a chelating polymer. Insolubility of crosslinking reaction product in acidic solution confirmed that crosslinking was occurred favorably by epichlorohydrin and it was proved that a swelling ratio of crosslinked chitosan(c-chitosan) in acetic acid solution could be thought as a measure of degree of crosslinking. Crofslinking mechanism was presumed from the various crosslinking methods. The effects of crosslinking ratio and phosphorylation conditions(amount of phosphorus-pentoxide, temperature and time) on the phosphorylation of c-chitosan were investigated.

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Synthesis of Crosslinked Chitosan Phosphate and Its Metal Ion Adsorption Characteristics(II)-Metal ion Adsorption Characteristics of Crosslinked Chitosan Phosphate- (인산화 가교 키토산의 합성 및 금속이온 흡착 특성(II)-인산화 가교 키토산의 금속이온 흡착 특성-)

  • Lee, Jong-Sun;Hong, Seong-Il;Jeon, Dong-Won
    • Textile Science and Engineering
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    • v.31 no.12
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    • pp.976-982
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    • 1994
  • With the epichlorohydrin antral PIOi-methanesulfonic acid system, crosslinked chitosan phosphate(p-c-chitosan). a new biodegradable chelating polymer, was synthesized successfully as reported in the previous paper Metal ion adsorption characteristics and selectivity tests for p-c-chitosan were carried out in 100/200ppm of various metal ion standard solutions(Cu2+. Co2+, Ci2+, Cd2+, Nn2+) by batch method. The adsorption capacity vat measured by an Atomic Absontion Spectroscopy(AAS) with appropriate adsorption time interval. According to the results, it was elucidated that the adsorption capacity of p-c-chitosan was influenced by crosslinking ratio and phosphate content and p-c-chitosan showed high adsorption equilibrium rate as well as high adsorption cilpacity. And p-c-chitosan showed more selective adsorption of Co2+ than Cu2+ in 200ppm mixed solution or Cu2+/Co2+.

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Electric Field Distribution and AC Dielectric Breakdown Properties according to Needle Electrode in EHV Insulators of XLPE (초고압 절연체 XLPE의 침전극에 따른 전계분포와 AC 절연파괴특성)

  • An, Byung-Chul;Hong, Jin-Woong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.136-139
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    • 2006
  • 최근 전력수요의 급증과 더불어 기기의 소형화와 경랑화를 위해 고분자절연재료의 사용이 증가하였으며, 근래 들어 환경성의 문제가 거론되면서 반영구적인 절연재료의 요구가 급증하였다. 그로 인하여 초고압 케이블의 절연재료로서 가교폴리에틸렌이 사용되어지고 있다. 이에 본 논문에서는 초고압전력용 케이블에서 절연재료로 사용되고 있는 가교폴리에틸렌 (XLPE) 내부전계분포 및 파괴전압과의 상관관계를 알아보기 위해 케이블에 칩 전극을 삽입하여 두께를 0.5, 1, l.5 [mm] 변화시켜 파괴전계를 검출하였으며, 또한 와이블 해석을 통한 파괴전압의 척도파라미터룰 검출하여, 시뮬레이션 인가전압으로 사용하였다. 시뮬레이션 경계요소법 (BEM)을 이용한 3 차원 전계해석 프로그램으로 조사하였다.

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