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Miscibility of Nitrated Poly(2,6 dimethyl-1,4 phenylene oxide)/Poly(strene-co-acrylonitrile) Blends
형초,하창식,옌융주,장웨이진,박성수 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
The work mainly studies the miscibility of nitrated poly(2,6-dimethyl-1,4-phenylene oxide) and poly(styrene-co-acrylonitrile). The poly(2,6-dimethyl-1,4-phenylene oxide) was reported to be immiscible with poly(styrene-co-acrylonitrile), indicating that the poly(2,6-dimethyl-1,4-phenylene oxide) may be too “non-polar” to be miscible with poly(styrene-co-acrylonitrile). Accordingly, in order to determine feasibility of improving miscibility of the poly(2,6-dimethyl-1,4-phenylene oxide) with poly(styrene-co-acrylonitrile) by chemically modified poly(2,6-dimethyl-1,4- phenylene oxide) containing “polar” monomers, we have prepared partially nitrated poly(2,6-dimethyl-1,4-phenylene oxide), where phenyl groups of the poly(2,6-dimethyl- ,4-phenylene oxide) are nitrated. DSC and DMA analyses showed that the binary blends have only a single Tg, indicating that the nitrated poly(2,6-dimethyl-1,4-phenylene oxide) and poly(styrene-co-acrylonitrile) are miscible.
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도초,안달래,형명명,이은별,김대근 한국생약학회 2012 생약학회지 Vol.43 No.3
Six phenolic compounds were isolated from the aerial parts of Bromus japonicus (Gramineae) through repeated column chromatography. Their chemical structures were elucidated as luteolin (1), caffeic acid (2), luteolin-7-O-β-D-glucopyranoside (3), quercetin-3-O-β-D-galactopyranoside (4), quercetin-3-O-β-D-glucopyranoside (5), and luteolin-4'-O-β-Dglucopyranoside (6), respectively, by spectroscopic analysis. These compounds were isolated for the first time from this plant.
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도초,배종진,박정숙,이재혁,김반지,이소연,이은별,안달래,형명명,김대근 한국생약학회 2013 생약학회지 Vol.44 No.4
Five phenolic compounds were isolated from the whole plants of Juncus diastrophanthus (Juncaceae) through repeated column chromatography. Their chemical structures were elucidated as methyl 3,5-di-O-caffeoylquinate (1), luteolin-7-O-β-D-glucopyranoside (2), methyl 4,5-di-O-caffeoylquinate (3), quercetin-3-O-β-D-arabinopyranoside (4), and methyl 3,4-di-O-caffeoylquinate (5) by spectroscopic techniques. These compounds were isolated for the first time from this plant.
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안달래,이은별,안민실,임혜원,형명명,도초,양재헌,김대근 한국생약학회 2012 생약학회지 Vol.43 No.4
As part of ongoing study focused on the discovery of natural antioxidants from Korean plants by measuring the DPPH (1,1-diphenyl-2-picrylhydrazyl) radical scavenging effect and superoxide quenching activity, ethanol extract of the aerial parts of Curcuma longa (Zingiberaceae) was found to show potent antioxidant activities. Subsequent activity-guided fractionation of the ethanol extract led to the isolation of two phenolic compounds, 1,2,3,4,6-penta-O-galloyl-β-D-glucopyranoside (1) and gallic acid (2), as antioxidant compounds. Their structures were elucidated by spectroscopic studies. Compounds 1 and 2 were isolated for the first time from this plant. These compounds showed the significant antioxidative effects during the DPPH free radical scavenging test, and the riboflavin- and xanthine-originated superoxide quenching activity tests.
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이청학,안달래,최훈,양재헌,이은별,형명명,도초,신태용,조종현,이재혁,박정숙,김대근 한국생약학회 2012 생약학회지 Vol.43 No.4
In the course of screening for antioxidant compounds by measuring the radical scavenging effect on 1,1-diphenyl-2-picrylhydrazyl (DPPH), a total extract of the twigs of Taxillus delavayi (Loranthaceae) was found to show potent radical scavenging activity. Subsequent activity-guided fractionation of the methanolic extract led to the isolation of two phenolic compounds,catechin (1) and galloyl catechin (2), as active principles. Their structures were elucidated by spectroscopic studies. These two compounds showed the significant antioxidative effects on DPPH, and riboflavin- and xanthin-originated superoxide quenching activities. And these two compounds also showed strong nitric oxide radical scavenging effects. In riboflavin- and xanthin-originated superoxide quenching activities and nitric oxide radical scavenging effect, compound 2 showed better antioxidant activities than vitamin C.
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