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Kinetik von Atom-Transfer Radikalischen Polymerisationen bis zu hohen Drücken

Kinetics of Atom-Transfer Radical Polymerization up to High Pressure

by Joachim Morick
Doctoral thesis
Date of Examination:2012-09-26
Date of issue:2012-11-02
Advisor:Prof. Dr. Michael Buback
Referee:Prof. Dr. Michael Buback
Referee:Prof. Dr. Philipp Vana
crossref-logoPersistent Address: http://dx.doi.org/10.53846/goediss-2245

 

 

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Abstract

English

Atom-transfer radical polymerization (ATRP) has been studied up to 2500 bar via online VIS/NIR-spectroscopy to monitor the evolution of both CuII concentration and monomer conversion. ATRP-equilibrium constants have been determined under polymerization conditions (KATRP) and in monomer-free model systems (Kmodel) for several combinations of ligands and initiators. Two branched and two linear ligands have been used. Initiators have been chosen to mimic the structure of a bromine-capped chain-end which occurs during ATRP of styrene, methyl methacrylate (MMA) or n-butyl acrylate (n-BA) with chain length unity. Applying pressure significantly enhances the Kmodel which is adequately represented by the reaction volume, ΔVR, model. The obtained values range from ‒16 cm^3
Keywords: Atom-Transfer Radical Polymerization; ATRP; kinetics; methyl methacrylate; styrene; butyl acrylate
Schlagwörter: Atom-Transfer Radikalische Polymerisation; ATRP; Kinetik; Methylmethacrylat; Styrol; Butylacrylat
 

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