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Effectively Analyzing Polymers Using Electron Paramagnetic Resonance (EPR) Spectroscopy

In this webinar, Dr Kalina Ranguelova from Bruker BioSpin, will provide an overview of various industrial and academic applications and literature examples using electron paramagnetic resonance (EPR) spectroscopy to understand paramagnetic behavior of different polymer materials. The ubiquity of free radicals, triplet states, and point defects in polymer materials has rendered EPR an indispensable tool in polymer science among other mainstream analytical techniques. EPR is the best technique for shedding light on these reactions and processes because of its unique ability to unambiguously detect paramagnetic species in a direct and non-intrusive manner. The technique identifies radical reaction intermediates as well as quantifies their concentrations, thus elucidating thermal and light activated mechanisms and kinetics of polymer reactions. It can be applied to samples in liquid or sold states over a wide range of temperatures.

Key Topics

  • Monitoring photopolymerization reactions for understanding electron transfer mechanisms in polymers
  • Polymerizations reaction kinetics
  • Cross-linking reactions
  • Annealing in polymers
  • Sterilizations effects


Dr. Kalina Ranguelova

Senior EPR Applications Scientist, Bruker BioSpin

Dr. Kalina Ranguelova is an EPR Applications Scientist in Bruker BioSpin Corporation since 2011. She completed her Ph.D. at The Bulgarian Academy of Sciences where she received a Ph.D. with research focused on inorganic copper complexes structure using electron paramagnetic resonance (EPR) spectroscopy. After two research positions at CUNY and National Institute for Environmental Sciences where she studied free radical biology and EPR spin trapping as method for measurement of reactive oxygen species (ROS), she joined Bruker and holds a role as Applications Scientist. Her current focus is detection and identification of free radicals in biological systems and pharmaceuticals using spin traps and spin probes. She has publications in journals like Journal of Biological Chemistry, Biochemistry, Free radical Biology and Medicine, etc. She has presented in many international meetings related to free radical research in biology and protein chemistry.

Dr. David Barr

Product Manager – AIC

David Barr received his PhD in 1994 from Utah State University (under the direction of Dr. Steven Aust). His research focused on Free Radical Reactions catalyzed by Lignin Peroxidase. This enzyme is released by a fungus that lives on trees and actively degrades the lignin polymer in “old dead wood” via a free radical mechanism. The program at USU was focused on using this fungus for the decontamination of environmentally persistent pollutants (e.g., pesticides and various military munitions waste.) David continued his work in free radical chemistry as a post-doctoral fellow at the Laboratory of Molecular Biophysics (NIEHS facility in RTP, North Carolina). Electron Spin Resonance spectroscopy was the method of choice in Dr. Ronald Mason’s research group at NIEHS. David then joined Bruker as an Application Scientist in 1996, working with various applications in ESR. More recently, he has become a product manager for Bruker’s bench top ESR systems and his focus is on the transfer of ESR methods to the industrial sector.