2014
DOI: 10.1002/ange.201409799
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pH‐Responsive Non‐Ionic Diblock Copolymers: Ionization of Carboxylic Acid End‐Groups Induces an Order–Order Morphological Transition

Abstract: A carboxylic acid based reversible additionfragmentation transfer (RAFT) agent is used to prepare gels composed of worm-like diblock copolymers using two nonionic monomers, glycerol monomethacrylate (GMA) and 2-hydroxypropyl methacrylate (HPMA). Ionization of the carboxylic acid end-group on the PGMA stabilizer block induces a worm-to-sphere transition, which in turn causes immediate degelation. This morphological transition is fully reversible as determined by TEM and rheology studies and occurs because of a … Show more

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Cited by 30 publications
(39 citation statements)
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“…Table 2) was a turbid free-flowing dispersion, which is characteristic of vesicles in the PISA literature. 66,81,83,84 TEM studies confirmed this morphology, with some evidence for the presence of oligolamellar vesicles (see Fig. 5).…”
Section: Raft Dispersion Polymerization Of Phenyl Acrylate In Ethanolsupporting
confidence: 57%
“…Table 2) was a turbid free-flowing dispersion, which is characteristic of vesicles in the PISA literature. 66,81,83,84 TEM studies confirmed this morphology, with some evidence for the presence of oligolamellar vesicles (see Fig. 5).…”
Section: Raft Dispersion Polymerization Of Phenyl Acrylate In Ethanolsupporting
confidence: 57%
“…Recently, Lovett and co-workers reported that similar PGMA–PHPMA diblock copolymer worms prepared using a carboxylic acid-based RAFT CTA undergo worm-to-sphere transitions upon a pH switch as a result of end-group ionization. 74 Thus, it was important to employ a non-ionic CTA in the present study in order to prevent such order–order morphological transitions on addition of the strongly basic APTES reagent.…”
Section: Resultsmentioning
confidence: 99%
“…pH-responsive diblock copolymer nano-objects have been prepared via PISA by Lovett et al 135 and Penfold et al 136 In the first case, 135 a carboxylic acid-functionalized RAFT CTA was used to prepare anionic PGMA–PHPMA worms via RAFT aqueous dispersion polymerization at around pH 3. Under these conditions, the terminal carboxylic acid group (p K a ≈ 4.7) is in its protonated neutral form and a soft aqueous worm gel was obtained at 10% solids.…”
Section: Stimulus-responsive Block Copolymer Nano-objectsmentioning
confidence: 99%