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Rate retardation trends in RAFT – an emerging monomer classification tool?

https://doi.org/10.1039/D3PY01332D

Nwoko, Tochukwu; Nguyen, Khoi; Saha, Nirob K.; Barner-Kowollik, Christopher; Konkolewicz, Dominik (March 2024, Polymer Chemistry)

The RAFT rate retardation effect is used to classify monomers according to their reactivity. The stability of the radical correlates inversely with the extent of retardation allowing a framework for classifying monomer reactivity to be established.
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Photons and photocatalysts as limiting reagents for PET-RAFT photopolymerization

https://doi.org/10.1016/j.cej.2022.141007

Parnitzke, Bryan; Nwoko, Tochukwu; Bradford, Kate G.E.; De Alwis Watuthanthrige, Nethmi; Yehl, Kevin; Boyer, Cyrille; Konkolewicz, Dominik (January 2023, Chemical Engineering Journal)

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Tuning the molecular weight distributions of vinylketone-based polymers using RAFT photopolymerization and UV photodegradation

https://doi.org/10.1039/D1PY01129D

Nwoko, Tochukwu; De Alwis Watuthanthrige, Nethmi; Parnitzke, Bryan; Yehl, Kevin; Konkolewicz, Dominik (November 2021, Polymer Chemistry)

The choice of chain transfer agent in reversible addition/fragmentation chain transfer polymerization has proven to be instrumental in modulating the dispersity of a certain polyphenyl vinyl ketone (PVK). The monomer, PVK, which can self-initiate when exposed to blue light, was used to synthesize homopolymers, block copolymers by extending with a different monomer and gradient polymers. Regardless of the polymer architecture or degree of polymerization, a consistent trend in polymer dispersity was quantified, with higher loadings of the less active chain transfer agent xanthate leading to higher dispersities. The dispersity could be further modulated by photodegradation of vinyl ketone polymers under UV irradiation.
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