Design of New Amphiphilic Triblock Copoly(2-oxazoline)s Containing a Fluorinated Segment
-
Kempe, Kristian; Baumgärtel, Anja; Hoogenboom, Richard; Schubert, Ulrich S.
- Abstract:
- New amphiphilic triblock copoly(2-oxazoline)s, containing
hydrophobic domains with fluorine-containing blocks,
were synthesized. Using microwave radiation as heating source,
triblock copolymers with narrow molar mass distributions were
obtained by the sequential addition of 2-ethyl-2-oxazoline, 2-(1-
ethylheptyl)-2-oxazoline, and 2-(2,6-difluorophenyl)-2-oxazoline.
The polymers obtained were characterized by size exclusion
chromatography, 1H NMR spectroscopy and matrix-assisted
laser desorption/ionization time-of-flight mass spectrometry
(MALDI-TOF MS). To investigate the incorporation of all three
monomers into the triblock copolymers, a model polymer was
prepared with shorter blocks exhibiting a suitable length to be
measured in the reflector mode of a MALDI-TOF MS. In addition,
kinetic investigations on the homopolymerizations of all monomers
were performed in nitromethane at 140 C, yielding the polymerization
rates under these conditions. DSC measurements
of poly(2-(1-ethylheptyl)-2-oxazoline) and poly(2-(2,6-difluorophenyl)-
2-oxazoline)) revealing glass transitions at about 33 and
120 C, respectively. The thermal analysis of a blend of the two
polymers showed two glass transitions revealing demixing,
which could be an indicating for the immiscibility of the two
components in the block copolymers.
- Year:
- 2010
- Type of Publication:
- Article
- Journal:
- Journal of Polymer Science: Part A: Polymer Chemistry
- Volume:
- 48
- Pages:
- 5100 - 5108