Journal
MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 213, Issue 18, Pages 1963-1969Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.201200261
Keywords
cloud point; living cationic ring-opening polymerization; molecular brush; poly(2-oxazoline); thermoresponsive
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Funding
- Elitenetzwerk Bayern
- King Abdullah University of Science and Technology (KAUST)
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Molecular brushes (MBs) of poly(2-oxazoline)s were prepared by living anionic polymerization of 2-isopropenyl-2-oxazoline to form the backbone and living cationic ring-opening polymerization of 2-n-propyl-2-oxazoline and 2-methyl-2-oxazoline to form random and block copolymers. Their aqueous solutions displayed a distinct thermoresponsive behavior as a function of the side-chain composition and sequence. The cloud point (CP) of MBs with random copolymer side chains is a linear function of the hydrophilic monomer content and can be modulated in a wide range. For MBs with block copolymer side chains, it was found that the block sequence had a strong and surprising effect on the CP. While MBs with a distal hydrophobic block had a CP at 70 degrees C, MBs with hydrophilic outer blocks already precipitated at 32 degrees C.
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