Controlled Radical Polymerization of N-Vinylpyrrolidone by Reversible Addition-Fragmentation Chain Transfer Process

Poly(N‐vinylpyrrolidone) (PNVP) was polymerized by RAFT process using diphenyldithiocarbamate of diethylmalonate (DPCM) as the reversible chain transfer agent in the presence of a small percentage of a conventional radical initiator (AIBN). The molar mass of the polymers synthesized by this method w...

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Bibliographic Details
Published in:Macromolecular symposia 2005-11, Vol.229 (1), p.8-17
Main Authors: Devasia, Renjith, Bindu, Raveendra L., Borsali, Redouane, Mougin, Nathalie, Gnanou, Yves
Format: Article
Language:English
Subjects:
Addition polymerization
amphiphilic diblock copolymers
Applied sciences
Chain transfer
Chemical Sciences
controlled radical polymerization
Copolymers
dithiocarbamate
Exact sciences and technology
Light scattering
N-vinylpyrrolidone
Organic polymers
Physicochemistry of polymers
Polymerization
Polymers
Preparation, kinetics, thermodynamics, mechanism and catalysts
Radicals
RAFT
Rafts
Styrenes
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Summary:Poly(N‐vinylpyrrolidone) (PNVP) was polymerized by RAFT process using diphenyldithiocarbamate of diethylmalonate (DPCM) as the reversible chain transfer agent in the presence of a small percentage of a conventional radical initiator (AIBN). The molar mass of the polymers synthesized by this method was found to increase with conversion and time. The presence of end group in the polymer chain could be confirmed by 1H NMR spectra. The molar masses calculated using 1H NMR spectroscopy and static light scattering (SLS) showed good agreement with the theoretical molar masses. The RAFT compound was fully consumed during the initial stages of the polymerization itself. The controlled nature of these polymers was further confirmed by generating diblock copolymers by sequential addition of monomers such as styrene or n‐butyl acrylate (n‐BA). PNVP efficiently participated as a macro‐RAFT reagent, and cross‐over reaction between the two blocks efficiently occurred. The successful diblock copolymer synthesis using PNVP as macro‐transfer reagent further confirms the “controlled” nature of such synthetic procedure.
ISSN:1022-1360
1521-3900
DOI:10.1002/masy.200551102