Read e-book online Chromatography of Polymers. Hyphenated and Multidimensional PDF

By Theodore Provder (Eds.)

ISBN-10: 0841217246

ISBN-13: 9780841217249

ISBN-10: 0841236615

ISBN-13: 9780841236615

content material: Quantitation in research of polymers by means of a number of detector SEC / Bernd Trathnigg --
Use of multidetector SEC for opting for neighborhood polydispersity / T.H. Mourey, K.A. Vu, and S.T. Balke --
The Chevron method of GPC axial dispersion correction / Wallace W. Yau --
Axial dispersion correction for the Goldwasser approach to absolute polymer Mn decision utilizing SEC-viscometry / Wallace W. Yau --
Polymer characterization through extreme temperature dimension exclusion chromatography utilizing molecular weight delicate detectors / S.J. O'Donohue and E. Meehan --
Use of the single-capillary viscometer detector, online to a dimension exclusion chromatography approach, with a brand new pulse-free pump / Raniero Mendichi and Alberto Giacometti Schieroni --
Molecular weight characterization of polymers by way of mixed GPC and MALDI TOF mass spectroscopy / J.L. Dwyer --
Quantitation within the research of oligomers by way of HPLC with evaporative mild scattering detector / Bernd Trathnigg, Manfred Kollroser, Dušan Berek, Son Hoai Nguyen, and David Hunkeler --
merits of picking out the molar mass distributions of water-soluble polymers and polyelectrolytes with FFFF-MALLS and SEC-MALLS / W.-M. Kulicke, S. Lange, and D. Heins --
Cross-fractionation of copolymers utilizing SEC and thermal FFF for selection of molecular weight and composition / solar Joo Jeon and Martin E. Schimpf --
Colloidal debris as immunodiagnostics : instruction and FFF characterization / Teresa Basinska and Karin D. Caldwell --
Molecular characterization of advanced polymers by way of coupled liquid chromatographic methods / Dušan Berek --
Two-dimensional liquid chromatography of sensible polyethers / Bernd Trathnigg, Manfred Kollroser, M. Parth, and S. Röblreiter --
Liquid chromatography below proscribing stipulations : a device for copolymer characterization / A. Bartkowiak and D. Hunkeler --
complete adsorption-desorption/SEC coupling in characterization of complicated polymers / Son Hoai Nguyen and Dušan Berek --
measurement exclusion chromatography-FTIR research of polyethylene / James N. Willis, James L. Dwyer, Xiaojun Liu, and William A. darkish --
elements affecting molecular weight and branching research of metallocene catalyzed polyolefins utilizing online GPC with gentle scattering, and viscometry detection / Trevor Havard and Peter Wallace --
Characterization of polyesters and polyamides via SEC and lightweight scattering utilizing 1,1,1,3,3,3-hexafluoro-2-propanol as eluent / Antonio Moroni and Trevor Havard --
Degradation of substituted polyacetylenes and impact of this method on SEC research of those polymers / Jiří Vohlídal and Jan Sedláček --
research of polysaccharides by way of SEC3 / D.T. Gillespie and H.K. Hammons --
program of multi-detector SEC with a publish column response procedure : conformational characterization of PGG-glucans / Y.A. Guo, J.T. Park, A.S. Magee, and G.R. Ostroff.

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Extra resources for Chromatography of Polymers. Hyphenated and Multidimensional Techniques

Example text

The presence of axial dispersion affects the hydrodynamic volume. In order to understand how axial dispersion affects the Mn value calculatedfromthe SEC-viscometry data, it is important to understand first how axial dispersion affects the relationship of SEC hydrodynamic volume versus the retention volume. The mathematical derivations of these concepts are presented below in the four inter-connected sections. ; ACS Symposium Series; American Chemical Society: Washington, DC, 1999. (7) 47 (1) Generalization of UC Equation to Include Axial Dispersion and Non-SEC Perturbations " If, ~ If, M, H.

The axial dispersion in the broad standard causes the Hamielec Μβ(ν) to rotate counter­ clockwisefromthe true calibration curve Μχ(ν). The pivot point is near the center of the broad-standard elution curve. To the left of this point, MJJ(V) is lower than Μχ(ν) and therefore will underestimate the sample MW. Conversely, for samples that elute later than the broad standard, the Hamielec method can grossly overestimate the sample MW. For the same reasons, this rotation of MJJ(V) can also cause erroneous shifts of the sample MWD curves to the wrong MW regions.

Or, Mnjru. Gc4a^sr (16) . ch004 2 Thus, 6 is the proper factor to correct the apparent or the Goldwasser numberaverage molecular weight to an axial-dispersion corrected or true number-average molecular weight obtainable from SEC-viscometry and universal calibration methodology. DISCUSSION The result of this work (equation 16) indicates that, without axial dispersion correction, the current Goldwasser method of sample M n determination using GPC-viscometry would underestimate the true M n value for the sample.

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