Synthesis and Properties of Gradient Copolymers Based on 2-Phenyl-2-oxazoline and 2-Nonyl-2-oxazoline
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Lambermont-Thijs, Hanneke M. L.; Mark, J. H. C. Jochems; Hoogenboom, Richard; Schubert, Ulrich S.
- Abstract:
- In this study, the structure–property relationships for a series of statistical
2-nonyl-2-oxazoline (NonOx) and 2-phenyl-2-oxazoline (PhOx) copolymers were
investigated for the first time. The copolymerization kinetics were studied and the
reactivity ratios were calculated to be rNonOx ¼ 7.1 +/- 1.4 and rPhOx ¼ 0.02 +/- 0.1
revealing the formation of gradient copolymers. The synthesis of a systematical
series of NonOx–PhOx copolymers is described, whereby the amount of NonOx was
increased in steps of 10 mol %. The thermal and surface properties were investigated
for this series of well-defined copolymers. The thermal properties revealed a linear
decrease in glass transition temperature for copolymers containing up to 39 wt %
NonOx. Furthermore, the melting temperature of the copolymers containing 0 to 55
wt % PhOx linearly decreased most likely due to disturbance of the NonOx crystalline
domains by incorporation of PhOx in the NonOx part of the copolymer. The surface
energies of spincoated polymer films revealed a strong decrease in surface
energy upon incorporation of NonOx in the copolymers due to strong phase separation
between NonOx and PhOx allowing the NonOx chains to orient to the surface.
- Year:
- 2009
- Type of Publication:
- Article
- Journal:
- Journal of Polymer Science: Part A: Polymer Chemistry
- Volume:
- 47
- Pages:
- 6433 - 6440