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지방족 copolyester 및 copolyesteramide 의 합성과 분해성 (2)
김우식,현석희,전일련,강혜정,이치규,김승환 ( Woo Sik Kim,Seok Hee Hyun,Il Ryon Jeon,Hye Jung Kang,Chi Giu Lee,Sung Hwan Kim ) 한국공업화학회 1996 공업화학 Vol.7 No.3
이 연구에서는 촉매로서 tetraphenyltin을 사용하여 D,L-lactide (2-LA)와 β-methyl-δ-valerolactone (MVL)의 공중합체를 합성하고 그 물성을 조사하였다. 공중합체중의 lactic acid반복단위(LA)의 조성은 단량체 공급에서의 LA조성보다 높았다. 공중합체중의 그 조성은 공중합시간의 증가와 더불어 감소하였다. 그 공중합체의 수율과 분자량은 공급조성중의 LA의 증가와 더불어 증가하였다. 이들 결과는 공중합에 있어서 2-LA의 반응성이 MVL의 반응성보다 크다는 것을 뜻한다. 공중합체의 수평균분자량은 54,000에서 63,000의 범위에 있었고 다분산성지수는 1.7에서 2.1의 범위에 해당하였다. 공중합체는 융점을 나타내지 않았고 유리전이온도만 나타내었다. Lipase에 의한 공중합체의 분해성의 경향은 L-lactide-MVL 공중합체의 분해성의 경향과 거의 같았다. D,L-lactide (2-LA) was copolymerized with β-methyl-δ-valerolactone (MVL) using tetraphenyltin as a catalyst and the properties of the copolymers were investigated. The composition of the repeating unit of lactic acid in the copolymers was higher than that in the monomer feeds. The composition of the lactic acid unit in the copolymers decreased with increasing copolymerization time. The yield and the molecular weight of the copolymer increased with increasing 2-LA in the feed composition. These results suggest that the reactivity of 2-LA is larger than that of MVL. The number average molecular weight was in the range of 54,000 to 63,000 and the polydispersity index was in the range of 1.7 to 2.1. The copolymers did not show melting point, but glass transition temperature. The degradable tendency of the copolymers with lipase was almost equal to that of L-lactide-MVL copolymer.
측쇄에 Perylene을 함유한 비공역계 전도성고분자의 전기적 성질
具廣謨,全一鍊 慶一大學校 1997 論文集 Vol.14 No.2
In order to develop new types of electrically conducting polymers, novel non-conjugated polymers containing a perylenyl chromophore as a pendant group, poly(3-vinylperylene) and poly (3-perylenylmethyl methacrylate), have been investigated. Chemically-doped polymers obtained on exposure to iodine vapor exhibited room-temperature conductivities of 10-6 S cm-¹for a sample of poly(3-vinylperylene) with a doping degree of ca. 32% and 10-8 S cm-¹for poly(3-perylenylmethyl methacrylate) with a doping deree of ca. 17%. The electrochemically-doped poly(3-vinylperylene) with doping degrees of 71∼86%, prepared by both electrolytic polymerization of 3-vinylperylene and electrochemical doping of poly (3-vinylperylene), exhibited room-temperature conductivities of 10-5∼10-⁴S cm-¹with activation energies of ca. 0.3∼0.4 eV. Poly(3-vinylperylene) was shown to function as a new type of cathode-active material for a rechargeable lithium battery.
金明哲,全一鍊 慶一大學校 1995 論文集 Vol.12 No.2
A variety of methods has been suggested to determine the acidity of γ-alumina. A titration method using Hammett indicators and a gas phase adsorption method using acidic probe molecules by means of combined volumetry-calorimetry technique are representative. In this study, the CNDO/2 calculations have been applied on cluster models for the typical active sites on γ-alumina to get charge densities, LUMO energies and bond orders. The B acidities of models were invesigated in terms of O-H bond orders. And the calculated LUMO energies showed the L acidities of the active sites.
Doping된 Poly(3-vinylperylene)의 제조 및 전기적 특성
전일련 경일대학교 산업기술연구소 1995 産業技術硏究所 論文集 Vol.5 No.-
Poly(3-vinylperylene) has been prepared by radical polymerization of 3-vinylperylene, and characterized by spectroscopic methods, mol. wt. determination, and differential scanning calorimetry. Doped polymers have been prepared by electrolytic polymerization of 3-vinylperylene, electrochemical doping of poly(3-vinylperylene) and chemical doping of poly(3-vinylperylene). The pendant perylenyl groups of the doped polymers were observed to contain oxidized radical cations, as identified by IR, ESR, and electronic absorption spectrum. The electrochemically-doped poly(3-vinylperylene) with doping degrees of 71∼86%, prepared by both electrochemical doping of poly(3-vinylperylene) and chemical doping of poly(3-vinylperylene), exhibited room temperature conductivities of 10??∼10⁴ S cm¹ with activation energies of 0.3∼0.4eV. The chemically-doped poly(3-vinylperylene) obtained on exposure to iodine vapor exhibited room temperature conductivity up to 10?? S cm?? with a doping degree of 32%. The electrical conduction for these polymers is of thermally activated process, which is illustrated in arrhenius plots for electrical conductivities of doped polymers.
Poly(3-perylenylmethyl methacrylate)의 전기적 성질
전일련,구광모,김우식 경북대학교 산업기술연구소 1993 産業技術硏究誌 Vol.21 No.-
In order to develop new types of electrically conducting polymers, poly(3-perylenylmethyl methacrylate)(PPeMMA), a novel polymer containing a perylenyl chromophore as the pendant group has been investigated. Chemically-doped PPeMMA was prepared by exposing PPeMMA to iodine vapour for 1-30 days. The partial pendant perylenyl groups of the doped polymers were observed to contain oxidized radical cations, as identified by e.s.r. spectrum and elemental analysis. The doped PPeMMA exhibits a conductivity of ca. 10^-8 S ㎝^-1 with a activation energy of ca. 0.36 eV.