Micellization of block copolymers

Riess, Gérard

doi:10.1016/s0079-6700(03)00015-7

Cited by 1,877 publications

(1,868 citation statements)

References 277 publications

(243 reference statements)

Supporting

Mentioning

1,811

Contrasting

Unclassified

Order By: Relevance

“…This latter characteristic has been observed in numerous systems of diblocks in aqueous solutions like PS-b-PAA or PtBSt-PSS [19,20,22,27,37,38]. In these examples, the core was made of a polymer with a high glass transition.…”

Section: Reversibility and Dynamics Of Self Assemblymentioning

confidence: 72%

See 1 more Smart Citation

Chemical analysis and aqueous solution properties of charged amphiphilic block copolymers PBA-b-PAA synthesized by MADIX®

Jacquin¹,

Muller

Talingting-Pabalan³

et al. 2007

Journal of Colloid and Interface Science

164

View full text Add to dashboard Cite

We have linked the structural and dynamic properties in aqueous solution of amphiphilic charged diblock copolymers poly(butyl acrylate)-b-poly(acrylic acid), PBA-b-PAA, synthesized by controlled radical polymerization, with the physico-chemical characteristics of the samples. Despite product imperfections, the samples self-assemble in melt and aqueous solutions as predicted by monodisperse microphase separation theory. However, the PBA core are abnormally large; the swelling of PBA cores is not due to AA (the Flory parameter PBA/PAA , determined at 0.25, means strong segregation), but to h-PBA homopolymers (content determined by Liquid Chromatography at the Point of Exclusion and Adsorption Transition LC-PEAT). Beside the dominant population of micelles detected by scattering experiments, capillary electrophoresis CE analysis permitted detection of two other populations, one of h-PAA, and the other of free PBA-b-PAA chains, that have very short PBA blocks and never self-assemble. Despite the presence of these free unimers, the self-assembly in solution was found out of equilibrium: the aggregation state is history dependant and no unimer exchange between micelles occurs over months (time-evolution SANS). The high PBA/water interfacial tension, measured at 20 mN/m, prohibits unimer exchange between micelles. PBA-b-PAA solution systems are neither at thermal equilibrium nor completely frozen systems: internal fractionation of individual aggregates can occur.

show abstract

Section: Reversibility and Dynamics Of Self Assemblymentioning

confidence: 72%

“…As previously shown in the literature, structures formed are often "out of equilibrium" [22] and may depend on the way the solutions were prepared. We used here two controlled routes to prepare aqueous solution.…”

Section: Sample Preparationmentioning

confidence: 96%

Chemical analysis and aqueous solution properties of charged amphiphilic block copolymers PBA-b-PAA synthesized by MADIX®

Jacquin¹,

Muller

Talingting-Pabalan³

et al. 2007

Journal of Colloid and Interface Science

164

View full text Add to dashboard Cite

show abstract

“…This type of polymers consists of three blocks which can differ from each other (ABC) [28][29][30][31][32][33][34][35][36][37] or can have two similar blocks (ABA) [37][38][39][40][41][42][43]. Numerous studies on synthesis of triblock copolymers via anionic as well as controlled radical polymerization have been published.…”

Section: Introductionmentioning

confidence: 99%

Influence of block sequence and molecular weight on morphological, rheological and dielectric properties of weakly and strongly segregated styrene-isoprene triblock copolymers

Georgopanos

Handge

Abetz

et al. 2016

Polymer

View full text Add to dashboard Cite

In this work, morphological, thermal, viscoelastic and dielectric properties of triblock copolymers consisting of styrene (S) and isoprene (I) blocks are discussed. SIS and ISI triblock copolymers were synthesized by sequential anionic polymerization, three of them exhibiting molecular weights below the entanglement molecular weight M e , three of them exhibiting molecular weights in the order of M e and two of them exhibiting molecular weights above M e . The objective of this work is the investigation of the influence of molecular weight and block sequence on relaxation of the block copolymer chains. Morphological investigations using small angle X-ray scattering and transmission electron microscopy studies reveal that a larger molecular weight is associated with a more pronounced microphase separation. The presence of two glass transition temperatures reveals microphase separation of the PI and PS blocks. The Fox-Flory equation was applied in order to describe the molecular weight dependence of the glass transition temperature of the polyisoprene and the polystyrene blocks. The analysis of rheological data reveals a Maxwell fluid behaviour for the weakly segregated block copolymers, whereas for the strongly segregated block copolymers a pronounced elastic behaviour at low frequencies of small amplitude shear oscillations was observed.In the intermediate regime of molecular weight, a complex viscoelastic behaviour appears. The plateau modulus G N o is influenced by the sequence of the PS and the PI blocks (SIS or ISI). Our analysis of segmental and normal mode relaxation in dielectric spectroscopy experiments show that the relaxation processes are strongly influenced by the block sequence (PI blocks tethered at one or 1 both ends) and the molecular weight. As a result, the block sequence in triblock copolymers influences dynamical properties in the glassy state and in the melt.

show abstract

“…The new strategy consists in replacing the classical amphiphilic template by an induced and reversible assembly of watersoluble block copolymers (WSBC) [13][14][15], which allows to recover the template in aqueous solution. The micellization [16][17][18] process results from electrostatic interactions between two oppositely charged polymers in aqueous solution, a hydrophilic polyelectrolyte-neutral diblock copolymer and a homopolyelectrolyte. Electrostatic complexation leads to an associative phase separation, known as complex coacervation [19], provided certain requirements meet; such as proximity to charge neutrality.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured silica templated by double hydrophilic block copolymers with a comb-like architecture

et al. 2011

View full text Add to dashboard Cite

Micellization of block copolymers

Cited by 1,877 publications

References 277 publications

Chemical analysis and aqueous solution properties of charged amphiphilic block copolymers PBA-b-PAA synthesized by MADIX®

Chemical analysis and aqueous solution properties of charged amphiphilic block copolymers PBA-b-PAA synthesized by MADIX®

Influence of block sequence and molecular weight on morphological, rheological and dielectric properties of weakly and strongly segregated styrene-isoprene triblock copolymers

Nanostructured silica templated by double hydrophilic block copolymers with a comb-like architecture

Contact Info

Product

Resources

About