The Impact of Band Broadening on Molar-Mass Determination of Narrow-Distribution Polymer by Size-Exclusion Chromatography

2011 ◽  
Vol 20 (8) ◽  
pp. 667-674 ◽  
Author(s):  
Arne Wolpers ◽  
Gregory T. Russell ◽  
Philipp Vana
Keyword(s):  
Size Exclusion Chromatography ◽  
Molar Mass ◽  
Size Exclusion ◽  
Mass Determination ◽  
Band Broadening ◽  
Exclusion Chromatography ◽  
The Impact

Mark–Houwink–Sakurada coefficients determination for molar mass of silk fibroin from viscometric results. SEC-MALLS approach

RSC Advances ◽  
2016 ◽  
Vol 6 (44) ◽  
pp. 38071-38078 ◽  
Author(s):  
D. Pawcenis ◽  
M. Syrek ◽  
M. A. Aksamit-Koperska ◽  
T. Łojewski ◽  
J. Łojewska
Keyword(s):  
Bombyx Mori ◽  
Size Exclusion Chromatography ◽  
Silk Fibroin ◽  
Molar Mass ◽  
Size Exclusion ◽  
Exclusion Chromatography

The results on the changes of average molar masses inBombyx morifibroin with use of size exclusion chromatography and viscometry are presented in terms of the determination of Mark–Houwink–Sakurada coefficients, which are lacking in the literature.

scholarly journals Size-exclusion chromatography of cellulose: observations on the low-molar-mass fraction

Cellulose ◽  
2020 ◽  
Vol 27 (16) ◽  
pp. 9217-9225
Author(s):  
Leena Pitkänen ◽  
Herbert Sixta
Keyword(s):  
Mass Distribution ◽  
Size Exclusion Chromatography ◽  
Mass Fraction ◽  
Molar Mass ◽  
Accurate Determination ◽  
Size Exclusion ◽  
Molar Mass Distribution ◽  
Universal Method ◽  
Exclusion Chromatography

AbstractAccurate determination of molar mass distribution for disperse cellulose samples has proved to be a challenging task. While size-exclusion chromatography coupled to multi-angle light scattering (MALS) and differential refractive index (DRI) detectors has become the most commonly used method for molar mass determination of celluloses, this technique suffers low sensitivity at the low-molar mass range. As discussed here, the universal method for accurate molar mass distribution analysis of cellulose samples not exists and thus thorough understanding on the differences of the various methodological approaches is important. In this study, the focus is in the accurate determination of the low-molar mass fraction. The results obtained by combining the two calibration strategies, MALS/DRI for polymeric region of a cellulose sample and conventional calibration for oligomeric region, was compared to the results obtained using only MALS/DRI (with extrapolation of the curve where signal-to-noise of MALS is low). For birch pulp sample, the results from the two approaches were comparable; it should be highlighted, however, that MALS/DRI slightly overestimates the molar masses at the low-molar-mass region.

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