• 제목/요약/키워드: polymer materials

검색결과 4,675건 처리시간 0.03초

Fabrication of Conducting Polymer Nanowires using Block Copolymer Nano-porous Templates for Photovoltaic Device

  • Lee, Jeong-In;Yu Jae-Woong;Kim, Jin-Kon;Russell Thomas P.
    • 한국고분자학회:학술대회논문집
    • /
    • 한국고분자학회 2006년도 IUPAC International Symposium on Advanced Polymers for Emerging Technologies
    • /
    • pp.312-312
    • /
    • 2006

  • Block copolymers with well-defined nanoscopic structures have recently gained much attention for their potential uses as functional nanostructures. Here, we show that nanoporous templates made from polystyrene-block-poly (methyl methacrylate) (PS-b-PMMA) satisfy a novel design concept. At first, arrays of nanoscopic cylindrical microdomains oriented normal to the surface can easily be prepared. Then, we fabricated ultra high density arrays of conducting polymer as poly(pyrrole) (Ppy) and poly(3,4-ethylenedioxythiophene) (PEDOT) nanowires with diameters of $25{\sim}40\;nm$ on the ITO glass by electropolymerization of the monomers inside nanoholes. These high density arrays of conducting polymer nanowires could be used as P-type materials for photovoltaic devices.

  • PDF

아질산형 hydrocalumite와 터폴리머 분말수지를 병용한 폴리머 시멘트계 재료의 자기방청기능 (Self-Corrosion Protection of Polymer Cementitious Materials Using Terpolymer Powders with a Nitrite-type Hydrocalumite)

  • 홍선희;김완기
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2010년도 춘계 학술논문 발표대회 1부
    • /
    • pp.73-76
    • /
    • 2010

  • This study deals with the properties of polymer-modified mortars with a nitrite-type hydrocalumite, which are effectively used as intelligent patch materials for deteriorated reinforced concrete structures. The calumite is a material that can adsorb the chloride ions (Cl-) causing the corrosion of reinforcing bars and liberate the nitrite ions (NO2-) inhibiting the corrosion in reinforced concrete, and can provide a self-corrosion inhibition function to the reinforced concrete. Polymer-modified mortars using hydrocalumite and terpolymer powders are prepared with various calumite contents and polymer-binder ratios, and tested for corrosion inhibition. Subsequently, regardless of the polymer-binder ratio, the replacement of ordinary portland cement with the calumite has a marked effect on the corrosion-inhibiting property of the polymer-modified mortars.

  • PDF

Interface control in polymer/clay nanocomposites

  • Lee, Sang-Soo;Park, Min;Kim, Junkyung
    • 한국복합재료학회:학술대회논문집
    • /
    • 한국복합재료학회 2003년도 추계학술발표대회 논문집
    • /
    • pp.11-15
    • /
    • 2003

  • In order to suppress a repulsive interfacial energy between hydrophilic clay and hydrophobic polymer matrix in preparing a polymer/clay nanocomposite, a third component of amphiphilic nature such as poly($\varepsilon$-caprolactone) (PCL) was introduced into the model system of styrene-acrylonitrile copolymers (SAN)/Na-montmorillonite. Once $\varepsilon$-caprolactone was polymerized in the presence of Na-rnontmorillonite, the successful ring-opening polymerization of $\varepsilon$-caprolactone and the well-developed exfoliated structure of PCL/Na-montmorillonite mixture were confirmed, Thereafter, SAN was melt-mixed with PCL/Na-montmorillonite nanocomposite, which resulted in that SAN matrix and PCL fraction were completely miscible to form homogeneous mixture with retention of the exfoliated state of Na-montmorillonite, exhibiting that PCL effectively stabilizes the repulsive polymer/clay interface and contributes the improvement of mechanical properties of the nanocomposites.

  • PDF

폴리머 시멘트 모르타르의 양생방법에 따른 물성 평가 (Evaluation for Performance According to Curing Method of Polymer- Modified Mortars)

  • 박헌일;유병철;오상근
    • 한국콘크리트학회:학술대회논문집
    • /
    • 한국콘크리트학회 2005년도 봄학술 발표회 논문집(II)
    • /
    • pp.273-276
    • /
    • 2005

  • Polymer-modified mortar was developed for improving the performance of modified mortar which is mixed with polymer, and it is used for protecting and repairing materials of building because of their excellent performance to improve characteristics which are compressive strength, flexural strength, and adhesive strength. However, the performances of the polymer-modified mortars are highly affected by materials, which are polymer, mortar, and aggregates, and conditions which are curing environment and testing method. Furthermore, dry curing method after hydrated curing has been recommended to make strong polymer film for the best curing method to make excellent characteristics. In this report, We investigated the co-relation between curing methods and the characteristics, which are compressive strength, flexural strength, and adhesive strength for the polymer-modified mortars that are used in the domestic area.

  • PDF