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pro vyhledávání: '"Gottfried Glöckner"'
Autor:
Gottfried Glöckner
'The problems involved in separating complex macromolecules require under standing not only the chromatographic process but also the physicochemical behavior of the solutes.'This sentence from the pen of Phyllis R. Brown 1, University of Rhode Isla
Autor:
Gottfried Glöckner
Publikováno v:
International Journal of Polymer Analysis and Characterization. 2:237-252
Chemically heterogeneous polymers can be separated according to composition by liquid chromatography. Usually, binary gradients are used where solvent strength and polarity are changed simultaneously. A new method employs three-component gradients: t
Publikováno v:
Chromatographia. 42:185-190
Retention times in gradient liquid chromatography of synthetic polymers are often dependent on sample size. They increase with column load if the separation mechanism is governed by a solution process but decrease with increasing load if the mechanis
Publikováno v:
Chromatographia. 39:557-563
Copolymers from styrene and methyl methacrylate (MMA) were separated by both normal and reversedphase gradient chromatography. Both modes could be performed by sudden-transition gradients where the polymers were injected into a non-solvent whose pola
Publikováno v:
Chromatographia. 39:170-174
Copolymers from styrene and ethyl methacrylate have been separated according to composition byn-heptane gradients on a C18 bonded phase after injection into acetonitrile and subsequent sudden transition to a concentration of either dichloromethane or
Autor:
Gottfried Glöckner
Publikováno v:
Chromatographia. 37:7-12
Proper retention of polymers in high performance liquid chromatography often requires injection into a starting eluent which is not a solvent for the sample under investigation. In this case, the polymer is precipitated at the top of the column. Subs
Publikováno v:
Angewandte Makromolekulare Chemie. 206:121-139
Brechungsindexinkremente der Copolymeren von N-Phenylmaleimid mit Styrol, Methylmethacrylat und Acrylnitril sowie der entsprechenden Homopolymeren wurden in verschiedenen Losungsmitteln bei 536 nm und 25°C gemessen. Die Brechungsindexinkremente der
Autor:
Gottfried Glöckner, D. Wolf
Publikováno v:
Chromatographia. 34:363-368
Block copolymers of styrene andt-butyl methacrylate can be analysed by methanol/tetrahydrofuran gradients on C18 or phenyl bonded phase columns. On both of these columns, retention increases with styrene content of the samples. At 50°C, the retentio
Autor:
Gottfried Glöckner
Publikováno v:
Makromolekulare Chemie. Macromolecular Symposia. 61:239-243
Size exclusion chromatography (SEC) is capable of evaluating the molecular weight distribution (MWD) of a sample. Information about the chemical composition distribution can be gained by gradient high performance liquid chromatography (gradient HPLC)
Publikováno v:
Chromatographia. 32:107-112
Copoly(styrene/acrylonitrile) samples (S/AN) have been repeatedly separated according to composition by gradient HPLC with alkane hydrocarbons as a starting eluent A and dichloromethane (DCM) or tetrahydrofuran (THF) as a solvent B. In these systems,