Yun Heum Park

Preparation of polystyrene/polyaniline blends by in situ polymerization technique and their morphology and electrical property

Electrically conducting polystyrene/polyaniline blends were prepared by in situ polymerization technique (method I), and simple solution blending (method II). Electrical conductivities of the blends prepared by method I are higher than those of the corresponding blends prepared by method II or any other methods. This is attributed to the fact that the blends prepared by method I have higher crystallinity and better homogeneous morphology than the blends prepared by method II.

EMI shielding intrinsically conducting polymer/PET textile composites

Intrinsically conducting polymer(ICP)/PET textile composites were prepared by chemical and electrochemical polymerization of ICP on a PET fabric in sequence. We investigated the effects of the chemical or electrochemical polymerization conditions on the properties of resulting composites such as electrical conductivity and electromagnetic interference shielding effectiveness (EMI SE). The ICP/PET composite prepared in this study was highly electrically conducting, showing 0.3 Ω-cm of the specific volume resistivity and about 35 dB of EMI SE over a wide frequency range.

Environmental Staility of EMI Shielding PET Fabric/Polypyrrole Composite

PET fabric/polypyrrole composites with high electrical conductivity were prepared by polymerization of polypyrrole on a PET fabric through both chemical and electrochemical oxidation of pyrrole monomer. We investigated environmental stability of the composite and measured activation energy using the Arrhenius Equation.

Preparation and electroactivity of poly(methylmethacrylate-co-pyrrolylmethylstyrene)–g-polypyrrole

Abstract The conducting poly(methylmethacrylate-co-pyrrolylmethylstyrene)–g-polypyrrole (PMMAPMS–g-PPy) was synthesized by the electrochemical reaction with PMMAPMS and pyrrole in the electrolyte solution containing lithium perchlorate and a mixture solvent of acetonitrile and dichloromethane. The precursor PMMAPMS was synthesized by the reaction with poly(methyl methacrylate-co-chloromethylstyrene) (PMMACMS) and potassium pyrrole salt. The content of pyrrolymethyl groups in PMMAPMS units was identified from the 1 H -NMR analysis. Chronoamperograms of pyrrole polymerization on the PMMAPMS matrix film indicated that the pyrrolymethyl groups in PMMAPMS acted as grafting centers for the growth of PPy. The SEM results and conductivity measurements supported the above graft copolymerization. The maximum conductivity of PMMAPMS–g-PPy copolymer film was around 0.1xa0S/cm.

A novel water-soluble and self-doped conducting polyaniline graft copolymer

A water-soluble and self-doped conducting polyaniline graft copolymer, poly(styrenesulfonic acid-g-aniline) (PSSA-g-PANI), was first synthesized and its electrical properties were investigated.

Formation of Polypyrrole Copolymer in PSPMS Precursor Film by Electrochemical Polymerization

Abstract The electrochemical copolymerization process of polypyrrole (PPy) in the PSPMS precursor film has been discussed. Constant potential electrolysis and SEM experiments showed that pyrrolyl groups in the precursor were oxidized to form grafting centers and PPy grew through the film.

Electrically Conducting Poly(Acrylonitrile-Co-Pyrrolylmethylstyrene)-G-Polypyrrole

Abstract Synthesis and the characteristics of an electrically conducting graft copolymer, poly(acrylonitrile-co-pyrrolylmethylstyrene)-g-polypyrrole (PANPMS-g-PPy) are reported. It was found that pyrrolyl groups in PANPMS acted as the nuclei for the electrochemical polymerization of PPy. Conductivity of PANPMS-g-PPy was 100 times higher than that of poly(acrylonitrile-co-chloromethylstyrene)/PPy (PANCMS/PPy) composite prepared under the same condition.

Preparation and electrochemical properties of poly(vinyl chloride)-g-poly(aniline) copolymer

The electroconductive graft copolymer, Poly(vinyl chloride)-g-poly(aniline)(PVC-g-PANI) was prepared by the electrochemical polymerization using a precursor as follows: The precursor polymer, poly(vinyl 1,4-phenylenediamine)(PVPD) dissolved in DMF was spin coated on a platinum electrode and polymerized electrochemically in the electrolytic mixture solution consisting of DMF, water, 0.1u2009M aniline, and 1.0u2009M electrolyte such as H2SO4, HCl, or HNO3. PVPD was synthesized chemically with PVC and potassium 1,4-phenylenediamine salt and characterized using FT-IR and 1H-NMR spectroscopy. The electrochemical properties such as cylclic voltammetry and chronoamperogram of PVC-g-PANI were investigated comparing with those of PVC/PANI composite.

Electrochemical Synthesis of Conducting Poly(methyl methacrylate-co-pyrrolylmethylstyrene)-g-Polypyrrole Copolymer

The conducting poly(methylmethacrylate-co-pyrrolylmethylstyrene)-g-poly pyrrole (PMMAPMS-g-PPy) was synthesized by the electrochemical reaction with PMMAPMS and pyrrole in the electrolyte solution containing lithium perchlorate and a mixture solvent of acetonitrile and dichloromethane. The precursor PMMAPMS was synthesized by the reaction with poly(methyl methacrylate-co-chloromethylstyrene) (PMMCMS) and potassium pyrrole salt.

Electrochemical polymerization and characterization of conducting copolymers from pyrrole and poly(acryloyl chloride)

The electroactive copolymer of poly(acryloyl chloride)(PAC) and polypyrrole(PPy) was synthesized by the electrochemical polymerization using a polymer precursor which contains pyrrole moiety in its side chain. Poly(acryloyl pyrrole)(PAP) was synthesized by the addition polymerization of monomer obtained by the reaction with acryloyl chloride and potassium pyrrole salt and characterized using FT-IR and 1 H-NMR spectroscopy. The electrochemical property and morphology of PAC-g-PPy copolymer was investigated comparing with those PAC/PPy composite.