The signal-to-noise issue in mass spectrometric analysis of polymers

Weight Distribution ◽

Mass Spectrometric ◽

Mass Spectrometric Analysis ◽

Spectrometric Analysis ◽

Signal To Noise ◽

Fundamental Limits ◽

Polymer Analysis

Mass spectrometric approaches to polymer analysis become increasingly ineffective as average molecular weight increases. This perspective explains these fundamental limits of MS for determining molecular weight distribution of high polymers.

Plastics � Determination of average molecular weight and molecular weight distribution of polymers using size-exclusion chromatography

10.3403/02805834u ◽

2019 ◽

Keyword(s):

Molecular Weight ◽

Weight Distribution ◽

Size Exclusion ◽

Plastics � Determination of average molecular weight and molecular weight distribution of polymers using size-exclusion chromatography

10.3403/02809911u ◽

2019 ◽

Keyword(s):

Molecular Weight ◽

Weight Distribution ◽

Size Exclusion ◽

Plastics � Determination of average molecular weight and molecular weight distribution of polymers using size-exclusion chromatography

10.3403/02823512u ◽

2019 ◽

Keyword(s):

Molecular Weight ◽

Weight Distribution ◽

Size Exclusion ◽

Plastics � Determination of average molecular weight and molecular weight distribution of polymers using size-exclusion chromatography

10.3403/30370154 ◽

2019 ◽

Keyword(s):

Molecular Weight ◽

Weight Distribution ◽

Size Exclusion ◽

Plastics � Determination of average molecular weight and molecular weight distribution of polymers using size-exclusion chromatography

10.3403/30370148 ◽

2019 ◽

Keyword(s):

Molecular Weight ◽

Weight Distribution ◽

Size Exclusion ◽

Phase Equilibria of Quasi-Ternary Systems Consisting of Multicomponent Polymers in a Binary Solvent Mixture III. Effects of Average Molecular Weight and Molecular Weight Distribution of the Original Polymer

Polymer Journal ◽

10.1295/polymj.16.591 ◽

1984 ◽

Vol 16 (8) ◽

pp. 591-607 ◽

Cited By ~ 8

Author(s):

Kenji Kamide ◽

Shigenobu Matsuda

Keyword(s):

Molecular Weight ◽

Phase Equilibria ◽

Weight Distribution ◽

Ternary Systems ◽

Solvent Mixture ◽

Binary Solvent ◽

Binary Solvent Mixture

The impact of ionic strength on the molecular weight distribution (MWD) of lignin dissolved during softwood kraft cooking in a flow-through reactor

Holzforschung ◽

10.1515/hf-2015-0103 ◽

2016 ◽

Vol 70 (6) ◽

pp. 495-501 ◽

Cited By ~ 3

Author(s):

Binh T.T. Dang ◽

Harald Brelid ◽

Hans Theliander

Keyword(s):

Molecular Weight ◽

Weight Distribution ◽

Ion Concentration ◽

Small Scale ◽

Kraft Cooking ◽

Flow Through ◽

Cooking Times ◽

The Impact

Abstract The molecular weight distribution (MWD) of dissolved lignin as a function of time during kraft cooking of Scots pine (Pinus silvestris L) has been investigated, while the influence of sodium ion concentration ([Na+]) on the MWD was in focus. The kraft cooking was performed in a small scale flow-through reactor and the [Na+] was controlled by the addition of either Na2CO3 or NaCl. Fractions of black liquors (BL) were collected at different cooking times and the lignin was separated from the BL by acidification. The MWD of the dissolved lignin was analyzed by GPC. Results show that the weight average molecular weight (Mw) of dissolved lignin increases gradually as function of cooking time. An increase of [Na+] in the cooking liquor leads to Mw decrement. Findings from cooks with constant and varying [Na+] imply that the retarding effect of an increased [Na+] on delignification is related to the decrease in lignin solubility at higher [Na+].