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- W1980183211 abstract "Prepolymers of random novolac and resol resins were separated according to the number of nuclei (phenol groups) and the number of methylol groups attached to the nuclei. Temperature programming elution at a constant column pressure and constant flow-rates of both carbon dioxide and a modifier was applied in the order of decreasing column temperature. Two pumps were installed in a supercritical chromatography system to deliver carbon dioxide and a modifier independently. Ethanol was used as the modifier. The initial column temperature was 120 or 150°C and the programming rate was 3 or 4°C/min. The back pressure at the outlet of the UV detector was between 154 and 178 kg/cm2. Nine oligomers for novolac resins from dihydroxydiphenylmethanes (DPM) (dimer, dinuclear) to decanuclear oligomers were separated. The percentages of three isomers, 2,2′-, 2,4′- and 4,4′-DPM, of dinuclear oligomers were 6, 26 and 68%, respectively. Seven isomers of trinuclear novolac oligomers were assigned. Molecular weight averages were calculated without any calibration standards, e.g., Mw = 417 and Mn = 366 for the sample examined here. Mono- to pentanuclear resol oligomers were separated. Peaks for 2- and 4-methylol phenols, 2,4- and 2,6-dimethylol phenols and 2,4,6-trimethylol phenol were assigned. Di- and trinuclear resol oligomers were separated according to the number of methylol groups attached to the phenol groups." @default.
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- W1980183211 date "1989-01-01" @default.
- W1980183211 modified "2023-10-10" @default.
- W1980183211 title "Separation of prepolymers of phenol-formaldehyde resins by supercritical-fluid chromatography" @default.
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- W1980183211 doi "https://doi.org/10.1016/0021-9673(89)90016-2" @default.
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