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Synthesis and molecular weight characterization of end-functionalized N-vinyl-2-pyrrolidone oligomers

✍ Scribed by Elisabetta Ranucci; Gloria Spagnoli; Luciana Sartore; Fabio Bignotti; Paolo Ferruti; Oddone Schiavon; Paolo Caliceti; Francesco M. Veronese

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
534 KB
Volume
196
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

New oligomers of N‐vinyl‐2‐pyrrolidone, functionalized at one end with hydroxy functions, were obtained by radical polymerization in the presence of a hydroxylated compound, namely 2‐isopropoxyethanol, acting as chain‐transfer agent. The oligomeric samples obtained were characterized in terms of molecular weight and molecular weight distribution by means of analytical size exclusion chromatography (SEC). To this purpose, a calibration curve for a set of SEC columns had been determined, making use of poly(N‐vinyl‐2‐pyrrolidone) standards purposely prepared. The chain transfer constant C~T~ of 2‐isopropoxyethanol towards N‐vinyl‐2‐pyrrolidone was determined from the knowledge of the cumulated number‐average degree of polymerization X̄~n~ and monomer conversion Y~t~ of the samples during the reaction.

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