Startseite Experimental determination of activation rate constant and equilibrium constant for bromo substituted succinimide initiators for an atom transfer radical polymerization process
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Experimental determination of activation rate constant and equilibrium constant for bromo substituted succinimide initiators for an atom transfer radical polymerization process

  • Chetana Deoghare EMAIL logo
Veröffentlicht/Copyright: 17. März 2022

Abstract

Alkyl bromides are used as initiators in most of the atom transfer radical polymerization (ATRP) process and play an important role for controlling the ATRP equilibrium. In this work, the effect of solvent on equilibrium constant of ATRP (K ATRP) and rate constant of activation (k act) of three isomeric alkyl bromides [namely, N-phenyl(3-bromo-3-methyl)succinimide, N-phenyl(3-bromo-4-methyl)succinimide, and N-phenyl(3-bromomethyl)succinimide] is reported. The k act and K ATRP values of alkyl bromide are determined experimentally using UV–Vis-NIR spectrometry. The termination rate constant for model compound is calculated using DOSY NMR spectroscopy. The k act and K ATRP values for the mentioned alkyl bromides are determined in five different polar solvent and the effect of polarity is observed. The obtained values of k act and K ATRP of N-phenyl(3-bromo-3-methyl)succinimide in acetonitrile at 25 °C is 6.60 × 10−2 L mol−1 s−1 and 1.42 × 10−9, respectively. These values are quite comparable with the experimentally determined reported k act and K ATRP of values of acrylates and benzyls initiators. Alternatively, the investigation of possible chain initiation activity for the ATRP process for the mentioned alkyl bromides is carried out theoretically using density functional theory (DFT) method [B3LYP/6-31+G(d) level]. A good correlation is obtained between the experimentally determined and theoretically calculated K ATRP values of studied alkyl bromides in chosen solvents. Significantly, it is found that the values of k act and K ATRP of alkyl bromides is solvent dependent and the magnitude values of the k act and K ATRP increases with increasing the solvent polarity. The proposed bromo substituted succinimides can be used as the initiator for the polymerization of acrylates, benzyls, maleimides, and itaconimides monomer under the selected solvent system.


Corresponding author: Chetana Deoghare, Department of Chemistry, Indus Institute of Sciences, Humanities and Liberal Studies, Indus University, Rancharda, Via Thaltej, Ahmedabad 382115, Gujarat, India, Phone: +91 2764 263414, e-mail:

Article note: A collection of invited papers based on presentations at the Virtual Conference on Chemistry and its Applications (VCCA-2021) held on-line, 9–13 August 2021.


  1. Research funding: This study was supported by Birla Institute of Technology and Science, Pilani – K. K. Birla Goa Campus, Goa, India.

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Supplementary Material

The online version of this article offers supplementary material (https://doi.org/10.1515/pac-2021-2012).


Published Online: 2022-03-17
Published in Print: 2022-07-26

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