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Difference in Molecular Weight Averages between a Precipitated Sample and the Original Polymer
Author(s) -
Pastoriza M. Alejandra,
Horta Arturo
Publication year - 2010
Publication title -
macromolecular theory and simulations
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 56
eISSN - 1521-3919
pISSN - 1022-1344
DOI - 10.1002/mats.200900054
Subject(s) - polymer , molar mass distribution , thermodynamics , chemistry , radical polymerization , precipitation , distribution (mathematics) , polymer chemistry , kinetics , polymerization , mathematics , organic chemistry , mathematical analysis , physics , quantum mechanics , meteorology
The difference in molecular weight distribution between a polymer as obtained in the reaction mixture and the polymer as purified sample may be important when the mechanism and kinetics of polymerization are deduced from the sample. This difference is calculated for distributions representative of the ideal mechanisms of step‐growth, free‐radical (combination and dismutation), controlled/living free‐radical, and living anionic polymerizations. Example values are given to the parameters that define the precipitation conditions (Flory‐Huggins interaction parameter, etc.), in order to calculate the errors committed in molecular weight averages when the values of the sample are used for the original polymer. Thus the range of conditions where these errors are significant is estimated.