Switching kinetics of thin thermo-responsive hydrogel films of poly(monomethoxy-diethyleneglycol-acrylate) probed with in situ neutron reflectivity

Zhong, Qi; Metwalli, Ezzeldin; Kaune, Gunar; Rawolle, Monika; Bivigou-Koumba, Achille M.; Laschewsky, André; Papadakis, Christine M.; Cubitt, R.; Müller‐Buschbaum, Peter

doi:10.1039/c2sm25401h

Cited by 35 publications

(72 citation statements)

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“…The resulting average value of V%D 2 O of the entire collapsed PMDEGA film at 45.0°C is 12.9%. In our previous study, 57 the swollen PMDEGA film in the same vapor atmosphere at 23.0°C had a film thickness of 413 Å and a value of V%D 2 O of 17.7%.…”

Section: Resultsmentioning

confidence: 99%

“…11,38−41,56−60 In our previous investigation, we observed that swollen PMDEGA films showed a complex response to a sudden thermal stimulus introduced by a temperature jump from below the demixing temperature (23°C ) to above the demixing temperature (45°C): Three stages of the induced effect were resolved, namely film shrinkage, rearrangement, and reswelling. 57 So far, only little attention has been paid to the opposite change of temperature, which is a temperature decrease from above the demixing temperature to below the demixing temperature. Regarding applications of thermoresponsive polymer coatings (e.g., in smart textiles), which are foreseen to undergo frequent transitions across the demixing temperature in either direction, such information will be essential.…”

Section: Introductionmentioning

confidence: 99%

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Rehydration of Thermoresponsive Poly(monomethoxydiethylene glycol acrylate) Films Probed in Situ by Real-Time Neutron Reflectivity

et al. 2015

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The rehydration of thermoresponsive poly(monomethoxydiethylene glycol acrylate) (PMDEGA) films exhibiting a lower critical solution temperature (LCST) type demixing phase transition in aqueous environments, induced by a decrease in temperature, is investigated in situ with real-time neutron reflectivity. Two different starting conditions (collapsed versus partially swollen chain conformation) are compared. In one experiment, the temperature is reduced from above the demixing temperature to well below the demixing temperature. In a second experiment, the starting temperature is below the demixing temperature, but within the transition regime, and reduced to the same final temperature. In both cases, the observed rehydration process can be divided into three stages: first condensation of water from the surrounding atmosphere, then absorption of water by the PMDEGA film and evaporation of excess water, and finally, rearrangement of the PMDEGA chains. The final rehydrated film is thicker and contains more absorbed water as compared with the initially swollen film at the same temperature well below the demixing temperature.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rehydration of Thermoresponsive Poly(monomethoxydiethylene glycol acrylate) Films Probed in Situ by Real-Time Neutron Reflectivity

et al. 2015

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“…Various methods including atomic force microscopy [54] visualizing method [55] and theory research [53] were employed. Typically, Müller-Busch Baum and coworkers investigated the switching kinetics of thin thermo responsive hydrogel films [52]. They proved that the collapse transition proceeds could be seen as three steps.…”

Section: Hydrogel Temperature Responsive Mechanismmentioning

confidence: 99%

“…This composited was very stable and exhibited excellent responsive properties. Additionally, combining a polyhedral oligomer silsesquioxane possessing eight epoxide groups and commercial PNIPAM, Lin et al [52] constructed the thermo responsive hydrogel nanofibre [48]. These nanofibres showed excellent hydrogel characteristics with fast swelling and deswelling responses triggered by temperature changes (Figure 2).…”

Section: Construction Of Composite Hydrogelsmentioning

confidence: 99%

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Temperature Responsive Hydrogels:Construction and Applications

Yin¹

2016

Polym Sci

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IntroductionAs a kind of smart materials, responsive hydrogels exhibit the rapidly responsive ability and sharp volume phase transitions according to the external stimuli from environment. Hydrogels demonstrate large-scale volumetric changes in response to small levels of stimuli. To the best of our knowledge, the most typical external stimuli factors related to responsive behaviors of smart hydrogels are pH [1][2][3][4][5], temperature [6][7][8], light [9][10][11] and multi-factors [12][13][14][15][16]. Additionally, the responsive hydrogels based on enzyme responsive [17,18], calcium responsive [19,20], glucose responsive [21,22], redox responsive [23,24], ionicstrength responsive [25,26], and chemical responsive [27] are also exhibited amazing responsive abilities. Among these insights, temperature responsive hydrogels are particularly important.This article gives an overview of the fundamentals of temperature responsive hydrogels. Some researches related to the construction methods, responsive mechanisms and applications of responsive hydrogels in the past few years are reviewed. Construction Method of Temperature Responsive HydrogelsThe temperature responsive hydrogels introduced in this section are mainly prepared based on the scaffolds of supramolecular assembled structure [28][29][30], hydrogel films [31] and hydrogel sphere [32,33]. Additionally, the temperature responsive hydrogels constructed employing the novel technics are also summarized [34][35][36]. Ritter and coworkers pioneered in construction of temperature responsive hydrogel using N-isopropylacrylamide as monomer [37]. As illustrated in Figure 1 based on the hostguest interaction between adamantyl group and cyclodextrin, the thermosensitive hydrogel 1 was prepared. Similarly, based on the host-guest interaction between D3-symmetric tris(spiroborate) cyclophane and [Ir(tpy) 2 ](PF 6 ) 3 complex, the assembled chain structure was obtained by Yamaguchi et al.[38]. Moreover, employing the host-guest interaction between cucurbit[8]uril and viologen/naphthoxy, a thermo-sensitive supramolecular polymer hydrogel 2 was prepared by Scherman and coworkers [39]. Typically, as the dynamic cross-link of CB[8]/viologen/naphthoxy, this hydrogel exhibited thermal reversibility. Additionally, the temperature responsive hydrogels based on hydrophobic interaction of dipeptides [40] and cyclic macromonomer crosslinking interaction [41] were also reported. Using a photo-crosslinkable benzophenone unit, Knoll and coworkers prepared the responsive hydrogel films by photo-cross-link method based on poly(N-isopropylacrylamide)(PNIPAM) copolymer [42]. To fabricate hydrogel nanoparticles with ultrafine nanosized hair, Yang's group developed a simple self-developed approach AbstractResponsive hydrogels have attracted researcher's special attentions. Up to now, a wide variety of responsive hydrogels are continuously constructed and the responsive mechanisms are deeply investigated. Typically, versatile responsive hydrogels with pH responsive, temperature responsive, ligh...

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Kinetics of Water Transfer Between the LCST and UCST Thermoresponsive Blocks in Diblock Copolymer Thin Films Monitored by In Situ Neutron Reflectivity

Metwalli

et al. 2022

Adv Materials Inter

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The kinetics of water transfer between the lower critical solution temperature (LCST) and upper critical solution temperature (UCST) thermoresponsive blocks in about 10 nm thin films of a diblock copolymer is monitored by in situ neutron reflectivity. The UCST‐exhibiting block in the copolymer consists of the zwitterionic poly(4‐((3‐methacrylamidopropyl)dimethylammonio)butane‐1‐sulfonate), abbreviated as PSBP. The LCST‐exhibiting block consists of the nonionic poly(N‐isopropylacrylamide), abbreviated as PNIPAM. The as‐prepared PSBP80‐b‐PNIPAM400 films feature a three‐layer structure, i.e., PNIPAM, mixed PNIPAM and PSBP, and PSBP. Both blocks have similar transition temperatures (TTs), namely around 32 °C for PNIPAM, and around 35 °C for PSBP, and with a two‐step heating protocol (20 °C to 40 °C and 40 °C to 80 °C), both TTs are passed. The response to such a thermal stimulus turns out to be complex. Besides a three‐step process (shrinkage, rearrangement, and reswelling), a continuous transfer of D2O from the PNIPAM to the PSBP block is observed. Due to the existence of both, LCST and UCST blocks in the PSBP80‐b‐PNIPAM400 film, the water transfer from the contracting PNIPAM, and mixed layers to the expanding PSBP layer occurs. Thus, the hydration kinetics and thermal response differ markedly from a thermoresponsive polymer film with a single LCST transition.

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Switching kinetics of thin thermo-responsive hydrogel films of poly(monomethoxy-diethyleneglycol-acrylate) probed with in situ neutron reflectivity

Cited by 35 publications

References 56 publications

Rehydration of Thermoresponsive Poly(monomethoxydiethylene glycol acrylate) Films Probed in Situ by Real-Time Neutron Reflectivity

Rehydration of Thermoresponsive Poly(monomethoxydiethylene glycol acrylate) Films Probed in Situ by Real-Time Neutron Reflectivity

Temperature Responsive Hydrogels:Construction and Applications

Kinetics of Water Transfer Between the LCST and UCST Thermoresponsive Blocks in Diblock Copolymer Thin Films Monitored by In Situ Neutron Reflectivity

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