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- Title
Synthesis and Aggregation Behaviors of Well-Defined Thermoresponsive Pentablock Terpolymers With Tunable LCST.
- Authors
Wu, Yufeng; Liu, Xingli; Wang, Yu; Guo, Zanru; Feng, Yujun
- Abstract
A series of thermoresponsive pentablock terpolymers, poly( N-isopropylacrylamide)- b-poly(ethylene oxide)- b-poly(propylene oxide)- b-poly(ethylene oxide)- b-poly( N-isopropylacrylamide), is prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization. The effect of NIPAM and PPO block lengths on lower critical solution temperature (LCST), critical micelle concentration (cmc), and aggregation number ( Nagg) is investigated via UV-Vis spectroscopy and steady-state fluorescence spectroscopy. The results show that upon increasing the block lengths, LCST and cmc decrease, while Nagg increases. TEM observation shows that associated spherical-like particles are evidenced below the LCST of the terpolymers, and regular or irregular spherical micelles or even intermicellar aggregates are observed above the LCST.
- Publication
Macromolecular Chemistry & Physics, 2012, Vol 213, Issue 14, p1489
- ISSN
1022-1352
- Publication type
Article
- DOI
10.1002/macp.201200106