Publikation: Control of Molar Mass Distribution by Polymerization in the Analytical Ultracentrifuge
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Angewandte Chemie International Edition. 2018, 57(27), pp. 8284-8287. ISSN 0570-0833. eISSN 1521-3773. Available under: doi: 10.1002/anie.201713149
Zusammenfassung
Molar mass distributions are of high interest in macromolecular chemistry because they directly determine 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 rigid theory of AUC.
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SPINNROCK, Andreas, Helmut CÖLFEN, 2018. Control of Molar Mass Distribution by Polymerization in the Analytical Ultracentrifuge. In: Angewandte Chemie International Edition. 2018, 57(27), pp. 8284-8287. ISSN 0570-0833. eISSN 1521-3773. Available under: doi: 10.1002/anie.201713149BibTex
@article{Spinnrock2018-07-02Contr-41745,
year={2018},
doi={10.1002/anie.201713149},
title={Control of Molar Mass Distribution by Polymerization in the Analytical Ultracentrifuge},
number={27},
volume={57},
issn={0570-0833},
journal={Angewandte Chemie International Edition},
pages={8284--8287},
author={Spinnrock, Andreas and Cölfen, Helmut}
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<dcterms:abstract xml:lang="eng">Molar mass distributions are of high interest in macromolecular chemistry because they directly determine 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 rigid theory of AUC.</dcterms:abstract>
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