Thermal Properties of Oligo(2-Ethyl-2-Oxazoline) Containing Comb and Graft Copolymers and their Aquous Solutions
-
Weber, Christine; Krieg, Andreas; Paulus, Renzo M.; Thijs, Hanneke M. L.; Becer, C. Remzi; Hoogenboom, Richard; Schubert, Ulrich S.
- Abstract:
- The cationic ring opening polymerization of 2-ethyl-2-oxazoline (EtOx) was
applied for the synthesis of methacrylate end-functionalized well-defined macromonomers
that could be polymerized in a controlled manner using reversible
addition-fragmentation chain transfer polymerization. The obtained comb polymers
revealed lower critical solution temperature behavior in aqueous solution. The cloud
points of these solutions could be tuned in a range from 35 8C to 858C by the
incorporation of hydrophobic methyl methacrylate comonomer in varying amounts
into the graft copolymers whereas copolymerization with methacrylic acid rendered
temperature and pH sensitive copolymers. Thermo-gravimetric analysis showed a
two-step decomposition of the graft copolymers and differential scanning calorimetry
revealed glass transition temperatures that are significantly lowered in
comparison to linear PEtOx.
- Year:
- 2011
- Type of Publication:
- Article
- Journal:
- Macromolecular Symposia
- Volume:
- 308
- Pages:
- 17 - 24