Self-association of double-hydrophilic copolymers of acrylic acid and poly(ethylene oxide) macromonomer

Khousakoun, Eric; Gohy, Jean‐François; Jérôme, Robert

doi:10.1016/j.polymer.2004.10.020

Cited by 65 publications

(55 citation statements)

References 28 publications

(27 reference statements)

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“…P(PEO 11 MA) 63 -block-PAA 657 -block-P(PEO 11 MA) 63 was synthesized by RAFT copolymerization of acrylic acid and a poly(ethylene oxide)-methylether-methacrylate (PEO 11 MA) macromonomer with bis(phenylmethyl) trithiocarbonate as a chain-transfer agent, as detailed elsewhere. [9] Because of the difunctionality of the chain-transfer agent and the reactivity ratios of the two comomoners (r AA ¼ 0.36; r PEO 11 MA ¼ 2.81), a tapered triblock copolymer is formed, P(PEO 11 MA) 63 -block-PAA 657 -block-P(PEO 11 MA) 63 . [9] For the sake of comparison a PAA 180 homopolymer was prepared according to the same RAFT procedure: solutions of (co)polymers (2.5 g/L) were prepared in DMF, and filtered through a membrane with a nominal pore size of 0.2 mm.…”

Section: Resultsmentioning

confidence: 99%

“…[9] Because of the difunctionality of the chain-transfer agent and the reactivity ratios of the two comomoners (r AA ¼ 0.36; r PEO 11 MA ¼ 2.81), a tapered triblock copolymer is formed, P(PEO 11 MA) 63 -block-PAA 657 -block-P(PEO 11 MA) 63 . [9] For the sake of comparison a PAA 180 homopolymer was prepared according to the same RAFT procedure: solutions of (co)polymers (2.5 g/L) were prepared in DMF, and filtered through a membrane with a nominal pore size of 0.2 mm. Mixtures of known amounts of these solutions were then prepared in which the acrylic acid/2-vinylpyridine molar ratio was fixed at one in order to trigger the formation of a dense micellar core.…”

Section: Resultsmentioning

confidence: 99%

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Segregation of Coronal Chains in Micelles Formed by Supramolecular Interactions

Khousakoun

Willet

Varshney

et al. 2004

Macromol. Rapid Commun.

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Summary: Spherical micelles have been formed by mixing, in DMF, a poly(styrene)‐block‐poly(2‐vinylpyridine)‐block‐poly(ethylene oxide) (PS‐block‐P2VP‐block‐PEO) triblock copolymer with either poly(acrylic acid) (PAA) or a tapered triblock copolymer consisting of a PAA central block and PEO macromonomer‐based outer blocks. Noncovalent interactions between PAA and P2VP result in the micellar core while the outer corona contains both PS and PEO chains. Segregation of the coronal chains is observed when the tapered copolymer is used.Inclusion of comb‐like chains with short PEO teeth in the corona triggers the nanophase segregation of PS and PEO as illustrated here (PS = polystyrene; PEO = poly(ethylene oxide)).imageInclusion of comb‐like chains with short PEO teeth in the corona triggers the nanophase segregation of PS and PEO as illustrated here (PS = polystyrene; PEO = poly(ethylene oxide)).

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Segregation of Coronal Chains in Micelles Formed by Supramolecular Interactions

Khousakoun

Willet

Varshney

et al. 2004

Macromol. Rapid Commun.

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“…The various synthetic routes to obtain these 'smart' materials have been recently compiled by McCormick et al and will not be detailed here [79]. The different kinds of stimuliresponsive block copolymers can be classified according to their nature: Ĺ hydrophilic block copolymers that bear only one stimuli-responsive segment, either temperature responsive [80][81][82][83][84][85] or pH-and ionic strength responsive [83,[86][87][88][89][90][91][92], Ĺ hydrophilic block copolymers that bear two stimuli-responsive segments or 'schizophrenic' block copolymers [83,85,[93][94][95][96][97] and Ĺ amphiphilic block copolymers that bear one or several stimuli-responsive segments [39, 74-76, 83, 98-102].…”

Section: Drug Deliverymentioning

confidence: 99%

Toward New Materials Prepared via the RAFT Process: From Drug Delivery to Optoelectronics?

Favier

Lambert

Charreyre

2008

Handbook of RAFT Polymerization

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IntroductionThe development of controlled/living ionic and radical polymerization techniques during the last decades represents a major breakthrough in polymer chemistry and polymer science. Since these techniques lead to the synthesis of a wide range of tailor-made macromolecular architectures, significant improvements are expected in the current or future application fields of polymers. The industrial impact will however depend on the versatility and applicability of each technique, and of course on the extra cost for the final product.In this context, controlled radical polymerizations (CRP) and especially the reversible addition-fragmentation chain transfer (RAFT) process [1-3] have attracted a lot of attention since they combine the advantages of conventional radical polymerization and living ionic polymerizations. Conventional radical polymerizations are cost-effective techniques, easy to process with a low sensitivity to water and oxygen and applicable to a wide range of monomers. In addition, CRP techniques result in a very efficient control over molecular weight (MW), molecular-weight distribution (MWD), microstructure, chain-end functionality and macromolecular architecture.As shown in the previous chapters of this handbook, the RAFT process appears as one of the most interesting CRP techniques. First, RAFT polymerization is very similar to conventional radical polymerization since it only requires the addition of a chain-transfer agent (CTA) in the medium. Second, RAFT is a very versatile process able to control the (co)polymerization of a large variety of monomers leading to a virtually unlimited macromolecular design library.As a consequence, RAFT polymerization is a well-suited and promising technique to prepare high-performance polymers for a wide range of applications. Indeed, an efficient control at the macromolecular level is a very important step to control and improve the macroscopic properties of the final materials ( Fig. 13.1).

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“…The block copolymer in our case spontaneously forms star micelles consisting of a collapsed PnBA core and a stretched PAA and a PEG corona in water. The hydrogen bonding between the carboxylic acid groups of PAA and the oxygen atoms of PEG may exist in the corona of the micelle [14].…”

Section: Self-association Of Triblock Copolymers In Watermentioning

confidence: 99%