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(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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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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Acknowledgment

We gratefully acknowledge the financial support from the Department of Science and Technology, Government of India, through grant no. SR/S1/PC-25/2006 and the Council of Scientific and Industrial Research (CSIR), Government of India, through grant no. 01(2099)/07/EMR-II. VKP and NKV acknowledge CSIR, Government of India for Fellowships. We also acknowledge the partial financial support from Banaras Hindu University.

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  1. Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi, 221005, India

    Vijay Kumar Patel, Avnish Kumar Mishra, Niraj Kumar Vishwakarma, Chandra Sekhar Biswas & Biswajit Ray

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  1. Vijay Kumar Patel
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  2. Avnish Kumar Mishra
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  3. Niraj Kumar Vishwakarma
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Correspondence to Biswajit Ray.

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Patel, V.K., Mishra, A.K., Vishwakarma, N.K. et al. (S)-2-(Ethyl propionate)-(O-ethyl xanthate) and (S)-2-(Ethyl isobutyrate)-(O-ethyl xanthate)-mediated RAFT polymerization of N-vinylpyrrolidone. Polym. Bull. 65, 97–110 (2010). https://doi.org/10.1007/s00289-009-0185-1

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  • DOI: https://doi.org/10.1007/s00289-009-0185-1

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