Correlating the mechanical and surface properties with the composition of triblock copoly(2-oxazoline)s

J.M. Kranenburg, H.M.L. Thijs, C.A. Tweedie, S. Höppener, F.D. Wiesbrock, R. Hoogenboom, K.J. Vliet, van, U.S. Schubert

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The elastic moduli, surface energies, and phase morphologies of poly(2-oxazoline) triblock copolymers were investigated and compared to the corresponding homopolymers and diblock copolymers, at a constant degree of polymerization. The elastic moduli of ABA triblock copolymers were bound by those of the respective AB diblock copolymers and A homopolymers. These results show that the elastic moduli of these copolymers - obtained by instrumented indentation - depended on the interplay between phase-separation, crystallization and hygroscopicity, and can be adjusted by tailoring the composition. The surface energy strongly depended on the presence of a poly(2-nonyl-2-oxazoline) block. If such a block was present, the surface energy was reduced due to segregation of nonyl side-chains to the surface. This segregation was promoted by annealing. The crystallization of nonyl side-chains at the surface promoted the development of surface texture and an increase in surface roughness, as demonstrated by atomic force microscopy topographic imaging. © 2009 The Royal Society of Chemistry
Original languageEnglish
Pages (from-to)222-229
JournalJournal of Materials Chemistry
Issue number2
Publication statusPublished - 2009


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