Thermosensitive behavior of amphiphilic triblock copolymers based on poly(acrylic acid) and poly(propylene oxide)

Pottier, Christophe; Morandi, Gaëlle; Rihouey, Christophe; Dulong, Virginie; Picton, Luc; Cerf, Didier Le

doi:10.1002/polb.24046

Cited by 4 publications

(8 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The cloud point was observed to depend on the degree of neutralization and the length of the PAA blocks, which is related to the amount of hydrogen bonds between the different polymer blocks and water. 42 Copolymers of methacrylic acid and dimethylaminoethyl methacrylate (DMAEMA) were recently shown to express UCST behavior in alcohols. 43…”

Section: Metal Cationsmentioning

confidence: 99%

How to manipulate the upper critical solution temperature (UCST)?

2017

View full text Add to dashboard Cite

show abstract

Section: Metal Cationsmentioning

confidence: 99%

How to manipulate the upper critical solution temperature (UCST)?

2017

View full text Add to dashboard Cite

show abstract

“…The influence of t BA/AA ratio in the monophasic domain (clear solution) onto the thermo‐sensitive behaviour was then investigated (Table ). In our previous study, the association of the PPO middle block of D‐[P(AA) x ] 2 copolymers under temperature was demonstrated . The critical aggregation concentration (CAC) of the D‐[P(AA) 19 ] 2 copolymer was measured at pH 7 and at various temperature by pyrene fluorescence (Fig.…”

Section: Resultsmentioning

confidence: 92%

“…Decreasing the pH of D‐[P(AA) 19 ] 2 solution under a critical value of 3.9 (Table ) resulted in the formation of large aggregates without precipitation. In our previous manuscript, we proved that this pH‐responsive behavior was governed by hydrogen bonds between carboxylic acid functions of poly(acid acrylic) (PAA) outer blocks and ether functions of PPO middle block …”

Section: Resultsmentioning

confidence: 99%

“…The totally hydrolyzed sample D‐[P(AA) 19 ] 2 showed two kinds of thermosensitive behaviors in aqueous solution . One is due to hydrogen bonds between PAA and PPO resulting in large aggregates.…”

Section: Methodsmentioning

confidence: 99%

“…Thermo‐responsive polymers such as poly(N‐isopropylacrylamide) (PNIPAAm) or poly(propylene oxide) (PPO) undergo a phase separation from above a critical temperature called LCST (low critical solubility temperature) . By coupling a PPO block to hydrophilic outer blocks such as poly(acrylic acid) (PAA), we reported an interesting auto‐associative and thermoresponsive behavior …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hydrophobically controlled self‐association of pH‐ and thermo‐sensitive triblock copolymers based on poly(acrylic acid‐co‐tert‐butyl acrylate) and poly(propylene oxide)

Pottier

Morandi

Rihouey

et al. 2016

J Polym Sci B Polym Phys

Self Cite

View full text Add to dashboard Cite

Aqueous solution properties of amphiphilic P(AAco-tBA)-b-PPO-b-P(AA-co-tBA) copolymers having various tBA contents are presented in this article. These copolymers show pH-sensitive behavior depending on tBA/AA ratio. Hydrophobic interactions between tBA units leading to pH-dependent macroscopic aggregates were evidenced by turbidimetry. The aggregation behavior of the PPO middle block was concealed in presence of tBA units. The formation of water-soluble aggregated objects was characterized by Asymmetrical Flow Field Flow Fractionation (AsF4). By increasing tBA/AA ratio, we observed an increase of aggregates size as well as a reduction of the critical concentration aggregation.

show abstract

Balancing Segregation and Complexation in Amphiphilic Copolymers by Architecture and Confinement

et al. 2017

View full text Add to dashboard Cite

Segregation is a well-known principle for micellization, as solvophobic components try to minimize interactions with other entities (such as solvent) by self-assembly. An opposite principle is based on complexation (or coacervation), leading to the coassembly/association of different components. Most cases in the literature rely on only one of these modes, though the classical micellization scheme (such as spherical micelles, wormlike micelles, and vesicles) can be enriched by a subtle balance of segregation and complexation. Because of their counteraction, micellar constructs with unprecedented structure and behavior could be obtained. In this feature, systems are highlighted, which are between both mechanisms, and we study concentration, architecture, and confinement effects. Systems with inter- and intramolecular interactions are presented, and the effects of polymer topology and monomer sequence on the resulting structures are discussed. It is shown that complexation can lead to altered micellization behavior as the complex of one hydrophobic and one hydrophilic component can have a very low surface tension toward the solvent. Then, the more soluble component is enriched at the surface of the complex and acts as a microsurfactant. Although segregation dominates for amphiphilic copolymers in solution, the effect of the complexation can be enhanced by branching (change of architecture). Another possibility to enhance the complexation is by confining copolymers in a (pseudo-) 2D environment (like the one available at liquid-liquid interfaces). These observations show how new structural features can be achieved by tuning the subtle balance between segregation and complexation/solubilization.

show abstract

Thermosensitive behavior of amphiphilic triblock copolymers based on poly(acrylic acid) and poly(propylene oxide)

Cited by 4 publications

References 28 publications

How to manipulate the upper critical solution temperature (UCST)?

How to manipulate the upper critical solution temperature (UCST)?

Hydrophobically controlled self‐association of pH‐ and thermo‐sensitive triblock copolymers based on poly(acrylic acid‐co‐tert‐butyl acrylate) and poly(propylene oxide)

Balancing Segregation and Complexation in Amphiphilic Copolymers by Architecture and Confinement

Contact Info

Product

Resources

About