(S)-2-(Ethyl propionate)-(O-ethyl xanthate) and (S)-2-(Ethyl isobutyrate)-(O-ethyl xanthate)-mediated RAFT polymerization of N-vinylpyrrolidone |
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Authors: | Vijay Kumar Patel Avnish Kumar Mishra Niraj Kumar Vishwakarma Chandra Sekhar Biswas Biswajit Ray |
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Affiliation: | (1) Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi, 221005, India; |
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Abstract: | (S)-2-(Ethyl propionate)-(O-ethyl xanthate) (X1) and the newly synthesized (S)-2-(ethyl isobutyrate)-(O-ethyl xanthate) (X2) were used as the reversible addition-fragmentation chain transfer (RAFT) agents for the radical polymerization
of N-vinylpyrrolidone (NVP). The former showed the better chain transfer ability in the polymerization at 60 °C. Kinetics study
with X1 shows the psuedo-first order kinetics upto 45% monomer conversion. Molecular weight (M
n) of the resulted polymer increases linearly with increase in the monomer conversion upto around 45%. Polydispersity of the
corresponding poly(NVP)s increase gradually from 1.2 to 1.9 with increase in the monomer conversion. Chain-end analysis of
the resulted polymer by 1H NMR shows clearly that polymerization started with radical forming out of xanthate mediator. Living nature of the polymerization
was confirmed from the successful homo chain extension experiment and also the hetero-chain extension experiment involving
synthesis of poly(NVP)-b-polystyrene amphiphilic diblock copolymer. |
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