Journal ArticleDOI
Relationship between apparent and true molecular weight in GPC
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TLDR
The analytical relationship between the molecular weight averages obtained from an experimental GPC curve and the true ones is calculated by use of one integration method in order to solve the convolution integral as mentioned in this paper.Abstract:
The analytical relationship between the molecular weight averages obtained from an experimental GPC elu tion curve and the true ones is calculated by use of one integration method in order to solve the convolution integral. The knowledge of these relationship signifies an useful tool to carry out critical considerations on the operation of different methods existing for the calculation of the spreading correction and for the elaboration of the calibration function.read more
Citations
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Journal ArticleDOI
Proposed Instrumental Spreading Shape Function (ISF) as Applied to Size Exclusion Chromatography (SEC)
TL;DR: In this article, a new statistical ISF is proposed, which is gaussian and symmetric in shape, is described by two parameters, instrument peak dispersion coefficient, σ2, and a new coefficient, a polyplatykurtic coefficient Ak.
Journal ArticleDOI
An Analysis of Imperfect Resolution in the Chromatography of Particle Suspensions
TL;DR: In this article, a general method of correction for imperfect resolution in the chromatography of particle suspensions was proposed, which overcomes most of the limitations of previously reported methods and is applied to the analysis of chromatograms of narrow Dow polystyrene latices measured by size exclusion chromatography.
Journal ArticleDOI
Calibration of Size-Exclusion Chromatography Systems with Polydisperse Standards
TL;DR: Size-Exclusion chromatography (SEC) is an important tool for the determination of molecular weights and, in particular, molecular weight distributions of diverse synthetic macromolecules, and superseded almost completely the older, tedious and less reliable fractionation methods as mentioned in this paper.
References
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Journal ArticleDOI
Method of calculating molecular weight distribution function from gel permeation chromatograms
TL;DR: An integral equation taking account of the limited resolution of the chromatographic columns is given to relate the gel permeation chromatogram and the true molecular weight distribution function.
Journal ArticleDOI
Polymer reactors and molecular weight distribution. VIII. A method of interpreting skewed GPC chromatograms
S. T. Balke,Archie E. Hamielec +1 more
TL;DR: In this article, a new method of interpreting GPC chromatograms which accounts for skewing and symmetrical axial dispersion has been developed, which has been verified experimentally for unimodal chromatogram and linear calibration curves over a wide range of GPC operating conditions, polymer molecular weights and polydispersities.
Journal ArticleDOI
An analytical solution to Tung's axial dispersion equation
Archie E. Hamielec,W. H. Ray +1 more
Journal ArticleDOI
Reliability of universal calibration for calculating molecular weights from GPC data
TL;DR: Weight average molecular weights were calculated for several sets of polymer samples from GPC chromatograms using different evaluation methods as discussed by the authors, and the results were compared with light scattering data in order to check the reliability of individual evaluation procedures: data obtained using the direct calibration are compared with those calculated via the Benoit universal calibration empolying directly measured Kuhn-Mark-Houwink constants and the Weiss-Cohn-Ginsberg iterative calculation.
Journal ArticleDOI
Über den absolutwert des fehlers bei der bestimmung von molekulargewichtsverteilungen mit der GPC-methode (messungen an polymethylmethacrylaten)
Von K. C. Berger,G. V. Schulz +1 more
TL;DR: In this paper, the authors show that the molecular weight distribution experimentally obtained by GPC under controlled and defined conditions are in general too broad by a certain amount, and that the ratio of Mw/Mn can be determined within few percents and molecular weight distributions can be obtained by correcting the GPC-curves.
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