Thermosensitive behavior of amphiphilic triblock copolymers based on poly(acrylic acid) and poly(propylene oxide) |
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| Authors: | Christophe Pottier Gaëlle Morandi Christophe Rihouey Virginie Dulong Luc Picton Didier Le Cerf |
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| Affiliation: | 1. Normandie Université, France;2. Université de Rouen, Laboratoire Polymères Biopolymères Surfaces, Mont Saint Aignan, France;3. CNRS UMR 6270 & FR3038, Mont Saint Aignan, France;4. INSA de Rouen, Laboratoire Polymères Biopolymères Surfaces, Saint‐étienne‐du‐Rouvray, France |
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| Abstract: | Self‐association in aqueous solution of amphiphilic poly(acrylic acid)‐b‐poly(propylene oxide)‐b‐poly(acrylic acid) (PAA‐b‐PPO‐b‐PAA) copolymers having various outer PAA block lengths are presented. These copolymers show two thermosensitive behaviors. The first one, due to hydrogen bonds between PAA and PPO resulting in large aggregates, was observed by visible spectroscopy. The second one, due to the association of PPO middle block into aggregates, was evidenced by dynamic light scattering and pyrene fluorescence. These critical temperatures both depend on the ionization and the length of PAA blocks. The characterization of the aggregates above the critical aggregation concentration by fluorescence quenching experiments showed a very low aggregation number corresponding to dimers or trimers association depending on the conditions. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016 , 54, 1507–1514 |
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| Keywords: | poly(propylene oxide) poly(acrylic acid) self‐association thermos‐sensitivity triblock copolymers stimuli-sensitive polymers sef-organization amphiphiles |
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