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Control of Molar Mass Distribution by Polymerization in the Analytical Ultracentrifuge
Author(s) -
Spinnrock Andreas,
Cölfen Helmut
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201713149
Subject(s) - molar mass , monomer , molar mass distribution , polymer , polymerization , chemistry , photopolymer , analytical ultracentrifugation , molar concentration , centrifuge , ultracentrifuge , thermodynamics , analytical chemistry (journal) , chromatography , organic chemistry , physics , nuclear physics
Molar mass distributions are of high interest in macromolecular chemistry because they directly determine the physical and chemical properties of polymers. A principal approach to obtain and control the shape of broad molar mass distributions is adjusting the initiator concentration in free radical polymerizations. A controlled gradient of the initiator concentration should potentially lead to tailored molar mass distributions. Here we use analytical ultracentrifugation (AUC) to adjust and measure a macroinitiator's concentration gradient. Subsequent photopolymerization of a uniformly distributed monomer leads to desired chain length distributions. Resulting distributions are described and calculated by a Schulz–Flory approach. The desired concentration profiles are simulated in advance and can be detected anytime by the optical systems in the centrifuge. Therefore, tailored broad molar mass distributions can now be produced using predictions from simulations using the established theory of AUC.