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SUMMARY:Fundamentals and Recent Advances in Controlled Radical Polymerizat
 ion - ProfessorKrzysztof Matyjaszewski\, Center for Macromolecular Enginee
 ring\, Carnegie Mellon University
DTSTART:20240514T130000Z
DTEND:20240514T140000Z
UID:TALK213526@talks.cam.ac.uk
CONTACT:Elzy Robinson
DESCRIPTION:Conventional free radical polymerization is among the most fre
 quently employed polymerization procedures to prepare over 100 million ton
 s of commercial polymers. However\, these polymers are ill-defined with hi
 gh dispersity\, uncontrolled molecular weight\, topology\, or composition.
  This is due to a very short lifetime of propagating radicals (<1 second) 
 and slow initiation. New controlled radical polymerization (CRP) procedure
 s (also called reversible deactivation radical polymerization) dramaticall
 y changed the control of polymer microstructure\, enabling concurrent grow
 th of polymer chains within minutes\, hours\, or even days. resulting in w
 ell-defined polymeric materials. Copper-based ATRP (atom transfer radical 
 polymerization) catalytic systems with polydentate nitrogen ligands are am
 ong the most efficient CRP systems. Recently\, by applying new initiating/
 catalytic systems\, Cu level in ATRP was reduced to a few ppm. ATRP of acr
 ylates\, methacrylates\, styrenes\, acrylamides\, acrylonitrile and other 
 vinyl monomers was controlled by various external stimuli\, including elec
 trical current\, light\, mechanical forces\, and ultrasound\, also in the 
 presence of air.
LOCATION:Dept of Chemistry\, Wolfson Lecture Theatre 
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