The influence of selective solvents on the transition behavior of poly(styrene-b-monomethoxydiethylenglycol-acrylate-b-styrene) thick films

Zhong, Qi; Adelsberger, Joseph; Niedermeier, Martin A.; Golosova, Anastasia; Bivigou-Koumba, Achille M.; Laschewsky, André; Funari, Sérgio S.; Papadakis, Christine M.; Müller‐Buschbaum, Peter

doi:10.1007/s00396-012-2879-4

Cited by 12 publications

(8 citation statements)

References 48 publications

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“…According to our previous investigation, the collapse transition sets in at a lower transition temperature (TT) when the film thickness increases . Similar to PS- b -PNIPAM, block copolymers containing PMDEGA, as for example PS- b -PMDEGA- b -PS, also form micellar structures in aqueous solutions . When varying the solvent from PMDEGA-selective to PS-selective, the obtained micelle structure can be reversed from PMDEGA core–PS shell to PS core–PMDEGA shell .…”

Section: Introductionmentioning

confidence: 92%

“…Further, the phase transition behavior is also affected in parts. The transition temperature is reduced due to the increased hydrophobicity of the copolymer, ,− while the general, rather complex response of PS- b -PMDEGA- b -PS films when passing across the transition is similar to that of the PMDEGA homopolymer films . Though showing the main features found for PMDEGA films, the additional PS blocks of the block copolymers weaken the response …”

Section: Introductionmentioning

confidence: 97%

“…28 Similar to PS-b-PNIPAM, block copolymers containing PMDEGA, as for example PS-b-PMDEGA-b-PS, also form micellar structures in aqueous solutions. 42 When varying the solvent from PMDEGAselective to PS-selective, the obtained micelle structure can be reversed from PMDEGA core−PS shell to PS core−PMDEGA shell. 42 Moreover, in thin films on silicon supports, such PS-b-PMDEGA-b-PS triblock copolymers form a microphaseseparated structure with a lamellar order as Si:PMDEGA/PS/ PMDEGA/PS.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of Hydrophobic Polystyrene Blocks on the Rehydration of Polystyrene-block-poly(methoxy diethylene glycol acrylate)-block-polystyrene Films Investigated by in Situ Neutron Reflectivity

et al. 2015

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The rehydration of thermoresponsive polystyrene-block-poly-(methoxy diethylene glycol acrylate)-block-polystyrene (PS-b-PMDEGA-b-PS) films forming a lamellar microphase-separated structure is investigated by in situ neutron reflectivity in a D 2 O vapor atmosphere. The rehydration of collapsed PS-b-PMDEGA-b-PS films is realized by a temperature change from 45 to 23 °C and comprises (1) condensation and absorption of D 2 O, (2) evaporation of D 2 O, and (3) reswelling of the film due to internal rearrangement. The hydrophobic PS layers hinder the absorption of condensed D 2 O, and a redistribution of embedded D 2 O between the hydrophobic PS layers and the hydrophilic PMDEGA layers is observed. In contrast, the rehydration of semiswollen PS-b-PMDEGA-b-PS films (temperature change from 35 to 23 °C) shows two prominent differences: A thicker D 2 O layer condenses on the surface, causing a more enhanced evaporation of D 2 O. The rehydrated films differ in film thickness and volume fraction of D 2 O, which is due to the different thermal protocols, although the final temperature is identical.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Influence of Hydrophobic Polystyrene Blocks on the Rehydration of Polystyrene-block-poly(methoxy diethylene glycol acrylate)-block-polystyrene Films Investigated by in Situ Neutron Reflectivity

et al. 2015

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“…changes in the surface properties. Many experiments studied structural changes in the morphology and the effects on the surface properties. − In contrast, the present work addresses the question of how the molecular dynamics, i.e., glassy dynamics, of a polymer brush is affected by swelling with tetrahydrofuran (THF), a good solvent for P2VP. Since each P2VP chain segment carries a dipole moment, broadband dielectric spectroscopy (BDS) allows for the measurement of the segmental relaxation, i.e., the dynamic glass transition.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics of Swollen Poly(2-vinylpyridine) Brushes

et al. 2016

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The influence of swelling on the molecular dynamics of poly(2-vinylpyridine) (P2VP) brushes is measured by broadband dielectric spectroscopy (BDS) in a broad temperature (350–420 K) and spectral (0.1 Hz–1 MHz) range with nanostructured, highly conductive silicon electrodes, separated by 35 nm high insulating silica spacers. A “grafting-to” method is applied to prepare P2VP brushes with a grafting density σ = 0.12 nm–2 and a film thickness d = 7.3 nm as measured by ellipsometry. Swelling of the P2VP brushes is realized with tetrahydrofuran (THF) vapor using a flow cell. In the dry state, the segmental dynamics of the P2VP brushes coincides with the dynamic glass transition of the bulk system while in the swollen state it becomes faster by up to 1–2 decades due to the plasticizing effect of THF.

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“…Recently, the non‐ionic polymer poly(methoxy diethylene glycol acrylate) (PMDEGA) has been investigated as an attractive alternative thermoresponsive polymer to PNIPAM, exhibiting an LCST in the physiologically particularly interesting range of 30–40 °C 33–40. PMDEGA bears only very short diethyleneglycol side chains, thus resembling sterically more to poly( N ‐alkylacrylamide)s than to its widely used, comb‐like higher poly(oligoethylene glycol acrylate) homologues.…”

Section: Introductionmentioning

confidence: 99%

Counterintuitive Photomodulation of the Thermal Phase Transition of Poly(methoxy diethylene glycol acrylate) in Aqueous Solution by trans–cis Isomerization of Copolymerized Azobenzenes

Miasnikova¹,

Benitez-Montoya²,

Laschewsky³

2013

Macro Chemistry & Physics

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The non-ionic monomer (methoxy diethylene glycol) acrylate is copolymerized with its azodye-functionalized acrylate analogue using reversible addition-fragmentation chain transfer (RAFT) polymerization. Copolymerization is increasingly diffi cult with increasing amounts of the azo-dye-bearing monomer. The resulting water-soluble polymers are thermosensitive, exhibiting lower critical solution temperature (LCST) behavior, which can be modulated by the photoinduced trans-cis isomerization of the dye. While already small contents of the hydrophobic azobenzene group reduce the phase-transition temperatures of the copolymers strongly, photoisomerization of the apolar trans -state to the more-polar cis -state has only a small effect, and decreases rather than increases the cloud points.

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The influence of selective solvents on the transition behavior of poly(styrene-b-monomethoxydiethylenglycol-acrylate-b-styrene) thick films

Cited by 12 publications

References 48 publications

Influence of Hydrophobic Polystyrene Blocks on the Rehydration of Polystyrene-block-poly(methoxy diethylene glycol acrylate)-block-polystyrene Films Investigated by in Situ Neutron Reflectivity

Influence of Hydrophobic Polystyrene Blocks on the Rehydration of Polystyrene-block-poly(methoxy diethylene glycol acrylate)-block-polystyrene Films Investigated by in Situ Neutron Reflectivity

Molecular Dynamics of Swollen Poly(2-vinylpyridine) Brushes

Counterintuitive Photomodulation of the Thermal Phase Transition of Poly(methoxy diethylene glycol acrylate) in Aqueous Solution by trans–cis Isomerization of Copolymerized Azobenzenes

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