• Title/Summary/Keyword: Polymer Material

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Mechanical, thermal and electrical properties of polymer nanocomposites reinforced with multi-walled carbon nanotubes (다층카본나노튜브가 보강된 고분자 나노복합체의 기계적, 열적, 전기적 특성)

  • Kook, J.H.;Huh, M.Y.;Yang, H.;Shin, D.H.;Park, D.H.;Nah, C.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.06a
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    • pp.215-216
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    • 2007
  • Semiconducting layers are thin rubber film between electrical cable wire and insulating polymer layers having a volume resistivity of ${\sim}10^2{\Omega}cm$. A new semiconducting material was suggested in this study based on the carbon nanotube(CNT)-reinforced polymer nanocomposites. CNT-reinforced polymer nanocomposites were prepared by solution mixing with various polymer type and dual filler system. The mechanical, thermal and electrical properties were investigated as a function of polymer type and dual filler system based on CNT and carbon black. The volume resistivity of composites was strongly related with the crystallinity of polymer matrix. With decreased crystallinity, the volume resistivity decreased linearly until a critical point, and it remained constant with further decreasing the crystallinity. Dual filler system also affected the volume resistivity. The CNT-reinforced nanocomposite showed the lowest volume resistivity. When a small amount of carbon black(CB) was replaced the CNT, the crystallinity increased considerably leading to a higher volume resistivity.

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Fundamental Properties of Cement Paste Using Complex Polymer (복합 폴리머를 이용한 시멘트 페이스트의 기초적 특성)

  • Choi, Jung-Gu;Lee, Gun-Cheol;Lee, Gun-Young;Cho, In-Sung
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2014.05a
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    • pp.124-125
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    • 2014
  • Polymer concrete has more excellent durability, tensile strength, flexural strength and waterproof performance mechanically than normal concrete, and as it mixes as a polymer binding material, it can reduce the cement use amount. This study reviews fundamental properties of cement material mixed with complex polymer. As a result of this study, as percentage of complex polymer mix increases, flow value will decrease so that liquidity and compression strength will decrease. On the other hand, in case of flexural strength, when the mixture is 10%, it increases significantly more than OPC.

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Microstructural Properties of the Polymer/MWCNT Transparent Conduction Film Fabricated on the $50{\mu}m$ Kepton Substrate ($50{\mu}m$ 켑톤 기판에 성막된 Polymer/MWCNT 투명 전도막의 미세구조)

  • Jang, Kyung-Uk
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2010.06a
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    • pp.253-253
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    • 2010
  • The Polymer/MWCNT composite films were fabricated by air-spray method under the 2 kg/$cm^2$ pressure using the multi-walled CNTs solution and the polymer on a $50{\mu}m$ kepton film substrates. We obtained the composite films which were sprayed with the MWCNT dispersion. In order to analysis the microstructure for the fabricated Polymer/MWCNT film, we used the X-ray diffraction (XRD) and SEM.

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Electrochemical Performances of Lithium-ion Polymer Battery with Polyoxyalkylene Glycol Acrylate-based Gel Polymer Electrolyte (Polyoxyalkylene Glycol Acrylate기 Gel Polymer Electrolyte를 적용한 리튬이온폴리머전지의 전기화학적 특성)

  • Kim, Hyun-Soo;Kim, Sung-Il;Na, Seong-Hwan;Moon, Seong-In
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.18 no.2
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    • pp.142-147
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    • 2005
  • In this work, a gel polymer electrolyte (GPE) was prepared using polyoxyalkylene glycol acrylate (POAGA) as a macromonomer LiCoO$_2$/GPE/graphite cells were prepared and their electrochemical properties were evaluated at various current densities and temperatures. The ionic conductivity of the GPE was more than 6.2${\times}$10$^{-3}$ S$.$$cm^{-1}$ / at room temperature. The GPE had good electrochemical stability up to 4.5 V vs. Li/Li$^{+}$. POAGA-based cells were showed good electrochemical performances such as rate capability, low-temperature performance, and cycleability. The cells, also, passed a safety test such as the overcharge and nail-penetration test.t.

Electrochemical Properties of Lithium-Ion Polymer Battery with PMMA IPN-Based Gel Polymer Electrolyte (PMMA IPN계 겔폴리머전해질을 채용한 리튬이온폴리머전지의 전기화학적 특성)

  • 김현수;신정한;나성환;엄승욱;문성인;김상필
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.16 no.11
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    • pp.994-1000
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    • 2003
  • In this study, gel polymer electrolytes (GPE) with semi-interpenerating network of poly (methyl methacrylate) and hexanediol dimethacrylate were synthesized and their electrochemical performances were evaluated. LiCoO$_2$/GPE/graphite cells were prepared and their performances depending on discharge currents and temperatures were evaluated. The precursor containing 5 vol% curable mixture had a low viscosity relatively. GPE showed good electrochemical stability up to potential of 4.8 V vs. Li/Li$\^$+/. Ionic conductivity of the gel polymer electrolyte at room temperature and -20$^{\circ}C$ was ca. 5.9 and 1.4${\times}$10$\^$-3/ Scm$\^$-1/, respectively. LiCoO$_2$/GPE/graphite cells showed good rate capability, low-temperature performance and cycleability.

The electrochemical properties of $TiO_2$ photoanode using SBM co-polymer binders (SBM 고분자중합 바인더가 사용된 $TiO_2$ 광전극의 전기화학적 특성)

  • Jin, En-Mei;Park, Kyung-Hee;Gu, Hal-Bon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2008.06a
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    • pp.360-361
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    • 2008
  • A new kind of SBM co-polymer binder as styrene, n-butyl acrylate, and methacrylic acid (SBM) monodisperse co-polymer binder materials basted on $TiO_2$ pastes was synthesized and this $TiO_2$ pastes were applied of dye-sensitized solar cells (DSSCs). The SBM co-polymer binder was prepared by soap-free emulsion copolymerization using a PEG-EEM macromonomer. The photoanodes were characterized by morphology investigated from field emission scanning electron microscopy (FE-SEM). The photoelectrochemical properties of the thin films and the performance of DSSCs were measured by photovoltaic-current density. DSSC based on the emulsion co-polymer binder was obtained conversion efficiency of 7.1% under irradiation of AM 1.5($100mWcm^{-2}$).

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리튬고분자 이차전지의 전기적 전기화학적 특성

  • 박수길;박종은;손원근;류부형;이주성
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1998.06a
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    • pp.159-162
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    • 1998
  • The new type polymer electrolyte composed of polyacrylonitrile(PAN) baed polymer electrolyte contain LiClO$_4$-EC/PC and LiPF$\sub$6/-EC/PC were developed for the weightless and long or life time of lithium polymer battery system with using polyaniline electrode. The gel type electrolytes were prepared by PAN at different lithium salts in the glove box. We prepared for polymer electrolyte with knife casting method. The minimum thickness of PAN gel electrolyte for the slim type is about <400∼500$\mu\textrm{m}$. These gel electrolytes showed good compatibility with lithium electrode. The test cell of Li/polymer electrolyte/Lithium cobalt oxide solid state cell which was prepared by different lithium salt was researched by electrochemical technique. Resistance of polymer electrolyte which consist of LiClO$_4$ is more less than that of LiPF$\sub$6/ and cycle life is more longer than that of LiPF$\sub$6/.

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Multi-aging Test for Estimating Long Time Performance of Polymer Insulators for Transmission line (송전용 폴리마 런자의 장기성능을 위한 복합열화시험)

  • 조한구;한세원;이운용;윤문수
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1999.11a
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    • pp.640-643
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    • 1999
  • This paper presents the results of multi-stress chamber experiments done to examine the tracking and erosion performance of polymer insulator. Multi-stress testing is able to demonstrate deficiencies of polymer insulator materials and designs, including the nature of interfaces in insulation design. Therefore, multi-stress testing is believed to a suitable test for evaluating the aging performance of polymer insulator designs. We have nvestigated IEC 61109 Annex C for estimating long time performance of polymer insulator.

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Magnetoelectric Polymer Composites (자기전기 고분자 복합체)

  • Ko, Kyujin;Noh, Byung-Il;Yang, Su-Chul
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.34 no.4
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    • pp.229-241
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    • 2021
  • Since 2010, polymer-based magnetoelectric (ME) composites have been developed with detailed investigations of multiferroic properties such as piezoelectric, magnetostrictive, and magnetoelectric, etc. In particular, as a piezoelectric polymer, poly(vinylidene fluoride) and its co-polymers have been widely used in ME composites for energy harvesting, health monitoring, environment treatment, and bio-medical applications. In this study, main research trend and selected experimental results of polymer-based ME composites are briefly reviewed with respect to composite structure as well as application field. A conclusion was drawn that the polymer-based ME composites would be feasible as flexible devices or functional membranes in the near future.

Technology Investigation of Polymer Insulator (Polymer Insulator의 개발 동향)

  • Kang, D.P.;Yoon, M.S.
    • Proceedings of the KIEE Conference
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    • 1992.07b
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    • pp.891-893
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    • 1992
  • Polymers have good electrical properties as an insulation material. Though they show more and less poor resistance to heat, radiation, and oxygen, the poor properties have been overcame by developing new resin with the saturated molecular structure and compounding resin with resistive fillers. Polymer insulators have many advantages; light weight, good mechanical properties, better contaimination performance, low cost by mass productivity, no destruction in many pieces, good flexibility in design, short manufacturing time. Usage of polymer insulators has increased rapidly with good credit on long term properties in advanced nations and will continue to grow.

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