Amphiphilic Diblock Copolymers with a Moderately Hydrophobic Block: Toward Dynamic Micelles

Lejeune, Elise; Drechsler, Markus; Jestin, Jacques; Müller, Axel H. E.; Chassenieux, Christophe; Colombani, Olivier

doi:10.1021/ma902822g

Cited by 71 publications

(95 citation statements)

References 67 publications

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“…Both monomers display the same polymerization rate. 136 Narrowly dispersed tBA homo-and block copolymer 3a has also been prepared by FeCl 2 ·4H 2 O-(PPh 3 ) 2 -catalyzed ATRP in acetone. 129 Anionic Polymerization.…”

Section: Chemical Reviewsmentioning

confidence: 99%

Polymeric Surfactants: Synthesis, Properties, and Links to Applications

et al. 2015

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Section: Chemical Reviewsmentioning

confidence: 99%

Polymeric Surfactants: Synthesis, Properties, and Links to Applications

et al. 2015

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“…7,8 However, only a few reports exist where a stimuli responsive copolymer block forms the solvophobic block(s) of the polymer. [9][10][11][12][13][14][15][16] These novel copolymer diblocks resulted in block copolymers whose aggregation and dynamics of self-assembly could be controlled by pH allowing equilibrated structures to form.…”

Section: Introductionmentioning

confidence: 99%

Tuning the aggregation behavior of pH-responsive micelles by copolymerization

et al. 2015

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Amphiphilic diblock copolymers, poly(2-(diethylamino)ethyl methacrylate-co-2-(dimethylamino)ethyl methacrylate)-b-poly(2-(dimethylamino)ethyl methacrylate), P(DEAEMA-co-DMAEMA)-b-PDMAEMA with various amounts of DEAEMA have been synthesized by RAFT polymerization. Their micellization in water has been investigated by scattering measurements over a wide pH range. It appeared that the polymers self-assembled into pH sensitive star like micelles. For a given composition, when the pH is varied the extent of aggregation can be tuned reversibly by orders of magnitude. By varying the copolymer composition in the hydrophobic block, the onset and extent of aggregation were shifted with respect to pH. This class of diblock copolymer offers the possibility to select the range of stimuli-responsiveness that is useful for a given application, which can rarely be achieved with conventional diblock copolymers consisting of homopolymeric blocks.

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“…One way to render these systems dynamic is to incorporate hydrophilic units within the hydrophobic blocks [28][29][30][31][32][33][34][35]. We have studied the effect of incorporating acrylic acid (AA) within the poly(n-butyl acrylate) B block of the triblock P(nBA-stat-AA)-b-PAA-b-P(nBA-stat-AA) [36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Slow dynamics in transient polyelectrolyte hydrogels formed by self-assembly of block copolymers

et al. 2013

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Transient polyelectrolyte hydrogels were formed by self-assembly of triblock copolyelectrolytes with a central hydrophilic block, poly(acrylic acid) (PAA), and two hydrophobic end blocks, poly(n-butyl acrylate(50%)-stat-acrylic acid(50%)) [P(nBA(50%)-stat-AA(50%))]. The relaxation of the concentration fluctuations was investigated by dynamic light scattering as a function of the concentration, the pH, the temperature, and the ionic strength. A relatively fast mode was observed at all polymer concentrations caused by cooperative diffusion of the polymers. Above the critical percolation concentration a second slow relaxation mode was observed caused by a linear displacement of small heterogeneities in the network with constant velocity. The relative amplitude of the slow mode was determined by the strength of the electrostatic repulsion. The velocity of the displacement in the transient network is shown to be directly correlated to the terminal relaxation time of the shear modulus and has the same Arrhenius temperature dependence. Both the velocity of the displacement and the mechanical relaxation strongly slow down with decreasing degree of ionization below 0.7 and increasing ionic strength above 0.5 M. A ballistic relaxation process has been reported earlier for colloidal gels, and the present study shows that it can also occur in polymeric networks.

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Amphiphilic Diblock Copolymers with a Moderately Hydrophobic Block: Toward Dynamic Micelles

Cited by 71 publications

References 67 publications

Polymeric Surfactants: Synthesis, Properties, and Links to Applications

Polymeric Surfactants: Synthesis, Properties, and Links to Applications

Tuning the aggregation behavior of pH-responsive micelles by copolymerization

Slow dynamics in transient polyelectrolyte hydrogels formed by self-assembly of block copolymers

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