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DTSTAMP:20260405T215757Z
UID:65b37b0239020492915087@ist.ac.at
DTSTART:20240627T113000
DTEND:20240627T123000
DESCRIPTION:Speaker: Athina Anastasaki\nhosted by Rafal Klajn\nAbstract: Co
 ntrolled radical polymerization (CRP) is widely used to prepare a broad ra
 nge of polymeric materials for diverseapplications in various fields [1\,2
 ]. One of the most important properties of CRP polymers is the ability to 
 maintainhigh livingness throughout the polymerization. In the first part o
 f the talk\, an acid-triggered radical polymerizationwill be demonstrated 
 which leads to the next generation of complex multiblock copolymers with c
 ontrolled sequence\,dispersity\, and end-group fidelity [3\,4]. Although h
 igh end-group fidelity is crucial to facilitate the synthesis of well-defi
 ned block copolymers\, it has rarely been exploited to reverse controlled 
 radical polymerization and regeneratethe starting materials. In the second
  part of the talk\, I will first show how\, under thermodynamically favour
 ed conditions[5\,6]\, it is possible to depolymerize linear\, bulky\, cros
 s-linked\, and functional polymethacrylates made by reversibleadditionfrag
 mentation chain-transfer (RAFT) polymerization [7]. Notably\, the depolyme
 rization product can beutilized to either reconstruct the linear polymer o
 r create an entirely new insoluble gel that can also be subjectedto depoly
 merization. A solvent-free chemical recycling methodology that efficiently
  operates for both ATRP andRAFT-synthesized materials will also be present
 ed [8]. However\, both depolymerization reactions are uncontrolledin natur
 e (i.e.\, rapid monomerization of activated chains)\, thus providing no ha
 ndle over the molecular weight andlimiting further applications. To addres
 s this\, a controlled depolymerization strategy is developed that enables 
 alinear decrease in molecular weight over time [9]. Such gradual unzipping
  of polymer chains is not only useful forrecycling purposes but also enabl
 es the structural characterization of various copolymers (i.e.\, AB dibloc
 k vs. BAdiblock vs statistical vs gradient) by facilitating the sequential
  release of monomers from the chain-end. At the end\,I will discuss how we
  can potentially utilize the obtained knowledge to switch from designer po
 lymers to commerciallyavailable materials containing undisclosed impuritie
 s.Athina AnastasakiDepartment of Materials\, ETH Zrichpolymeric.mat.ethz.c
 hMaking and UnmakingVinyl Polymers viaRadical PolymerizationsJune27 Thursd
 ay 2024 15:30Moonstone Room F[1] K. Parkatzidis\, H. S. Wang\, N. P. Truon
 g\, A. Anastasaki\, Chem 2020\, 6\, 15751588.[2] N. P. Truong\, G. R. Jone
 s\, K. G. E. Bradford\, D. Konkolewicz\, A. Anastasaki\, Nat. Rev. Chem. 2
 021\, 5\, 859869.[3] M.-N. Antonopoulou\, R. Whitfield\, N. P. Truong\, D.
  Wyers\, S. Harrisson\, T. Junkers\, A. Anastasaki\, Nat. Chem. 2022\, 14\
 , 304312.[4] M.-N. Antonopoulou\, G. R. Jones\, A. A. Kroeger\, Z. Pei\, M
 . L. Coote\, N. P. Truong\, A. Anastasaki\, Nat. Synth. 2024\, 3\, 347356.
 [5] G. R. Jones\, H. S. Wang\, K. Parkatzidis\, R. Whitfield\, N. P. Truon
 g\, A. Anastasaki\, J. Am. Chem. Soc. 2023\, 145\, 98989915.[6] V. Lohmann
 \, G. R. Jones\, N. P. Truong\, A. Anastasaki Chem. Sci. 2024\, 15\, 83285
 3.[7] H. S. Wang\, N. P. Truong\, Z. Pei\, M. L. Coote\, A. Anastasaki\, J
 . Am. Chem. Soc. 2022\, 144\, 46784684.[8] R. Whitfield\, G. R. Jones\, N.
  P. Truong\, L. E. Manring\, A. Anastasaki\, Angew. Chem. Int. Ed. 2023\, 
 62\, e202309116.[9] H. S. Wang\, K. Parkatzidis\, T. Junkers\, N. P. Truon
 g\, A. Anastasaki\, Chem 2024\, 10\, 388401.
LOCATION:Moonstone Bldg / Ground floor / Seminar Room F (I24.EG.030f)\, IST
 A
ORGANIZER:alazic@ist.ac.at
SUMMARY:Athina Anastasaki: Making and Unmaking Vinyl Polymers via Radical P
 olymerizations
URL:https://talks-calendar.ista.ac.at/events/4959
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