Rational design of an amorphous poly(2-oxazoline) with a low glass-transition temperature: Monomer synthesis, copolymerization, and properties

Kristian Kempe, Stefan Jacobs, Hanneke M L Lambermont-Thijs, Martin M W M Fijten, Richard Hoogenboom, Ulrich S. Schubert

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45 Citations (Scopus)

Abstract

A new poly(2-alkyl-2-oxazoline) having a branched side chain, namely, 2-(3-ethylheptyl)-2-oxazoline (EHOx), was synthesized. The microwave-assisted homopolymerization as well as the copolymerization with 2-ethyl-2-oxazoline (EtOx) are reported, whereby the determination of the reactivity ratios indicates the occurrence of a random polymerization. Further studies were performed regarding the thermal and the surface properties. p(EHOx) showed a glass transition of -6 °C, whereas no melting temperature could be detected, representing the amorphous poly(2-oxazoline) with the lowest reported T g to date. Furthermore, the systematic random copolymerization with EtOx in the range from 0 to 100% EHOx revealed a linear dependence of T g with composition as well as a complex dependence of the surface energy on the composition showing two plateau regimes.

Original languageEnglish
Pages (from-to)4098-4104
Number of pages7
JournalMacromolecules
Volume43
Issue number9
DOIs
Publication statusPublished - 11 May 2010
Externally publishedYes

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