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Poly (N-ethyl-2-vinyl-pyridinium) bromide의 탈염수 용액에서의 자기확산
김홍두 慶熙大學校 材料科學技術硏究所 1993 材料科學技術硏究論集 Vol.6 No.-
The self-diffusion coefficient (D_(s)) of poly[(N-ethyl-2-vinyl-pyridinium) bromide] (P2VP-EtBr) was measured in salt-free aqueous solution with forced Rayleigh scattering technique. At each molecular weight solutions up to 5wt% of P2VP-EtBr showed very little change in D_(s). Above 10wt%, D_(s) for P2VP-EtBr showed stronger concentration dependence than that of neutral polymer. What is most striking about our results is near molecular weight independence of D_(s) in high molecular weight regime. Qualitatively, our results were interpreted using the local ordering of the chain segment by long range coulombic interaction.
전기전도성 폴리피롤의 In-Situ 라만 분광학방법에 의한 연구
김홍두 慶熙大學校 材料科學技術硏究所 1992 材料科學技術硏究論集 Vol.5 No.-
In-situ Raman spectra of polypyrrole were studied as a function of the applied Potentials using copper phthalocyanine tetrasulphate(CuPcTs) and dodecylsulfate(DS) ions as dopants. The 1552 cm^(-1) Raman shift of symmetric C=C stretching band has been changed towards long wavenumber as the polypyrrole film oxidized. The significant resonance Raman effects have been shown when the polypyrrole was reduced below -0.6V and may be due to the complex formation of the partially reduced polypyrrole with CuPcTs and DS ions.