Unraveling the surface properties of PMMA/azobenzene blends as coating films with photoreversible surface polarity

Hisham, Shameer; Sarih, Norazilawati Muhamad; Tajuddin, Hairul Anuar; Abidin, Zamri Zainal; Abdullah, Zanariah

doi:10.1039/d1ra01192h

Cited by 8 publications

(4 citation statements)

References 56 publications

(33 reference statements)

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“…We focused our studies on ve amorphous polymers: polystyrene (PS), poly(4vinylpyridine) (P4VP) and polyacrylates with methyl (PMMA), n-butyl (PBMA), and n-hexyl (PHMA) side chains (Scheme 1b). PS, P4VP and PMMA are rigid (T g values between +100 and +137 °C) matrices oen utilised as scaffolds for photoswitches, [58][59][60][61] differing in polarity and aromaticity. PBMA and PHMA (T g values +32 and −5 °C) were chosen to give information on the photoswitching behaviour in a soer polymeric environment.…”

Section: Resultsmentioning

confidence: 99%

Red-light photoswitching of indigos in polymer thin films

et al. 2023

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Section: Resultsmentioning

confidence: 99%

Red-light photoswitching of indigos in polymer thin films

et al. 2023

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“…Furthermore, taking advantage of the photoresponsivity of their surfaces, azobenzenefunctionalized side-chain polymers show reversible wettability and polarity. These features can open the field to surface technological applications [30].…”

Section: Introductionmentioning

confidence: 99%

An Electron Spin Resonance Study Comparing Nanometer–Nanosecond Dynamics in Diblock Copolymers and Their Poly(methyl Methacrylate) Binary Blends

Andreozzi,

Martinelli

2023

Polymers

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Block copolymers are a class of materials that are particularly interesting with respect to their capability to self-assemble in ordered structures. In this context, the coupling between environment and dynamics is particularly relevant given that movements at the molecular level influence various properties of macromolecules. Mixing the polymer with a second macromolecule appears to be an easy method for studying these relationships. In this work, we studied blends of poly(methyl methacrylate) (PMMA) and a block copolymer composed of PMMA as the first block and poly(3-methyl-4-[6-(methylacryloyloxy)-hexyloxy]-4′-pentyloxy azobenzene) as the second block. The relaxational properties of these blends were investigated via electron spin resonance (ESR) spectroscopy, which is sensitive to nanometric length scales. The results of the investigations on the blends were related to the dynamic behavior of the copolymers. At the nanoscale, the study revealed the presence of heterogeneities, with slow and fast dynamics available for molecular reorientation, which are further modulated by the ability of the block copolymers to form supramolecular structures. For blends, the heterogeneities at the nanoscale were still detected. However, it was observed that the presence of the PMMA as a major component of the blends modified their dynamic behavior.

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“…The photo-controllability of the surface properties is achieved by incorporating some photosensitive group into it, with the azobenzene chromophore being the most widely used one [15]. Such "azobenzination" allows a number of features of the smart surface, namely: the control over adhesive properties of a surface [16], manipulation of nano objects on it [17], photo-controllable separation of a photoresponsive surfactant from the adsorbate [18], achieving photo-reversible surface polarity [19], photo-controllable orientational order affecting surface anchoring of liquid crytals [20], etc. Recently, the advanced LDL adsorber in the form of a photo-controllable smart surface was developed, characterised by high selectivity and reusability [21].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Low Density Lipoproteins on an Azobenzene-Containing Polymer Brush: Modelling by Coarse-Grained Molecular Dynamics

Ilnytskyi,

Yaremchuk,

Komarytsia

2023

Processes

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One of the strategies to reduce the contents of low density lipoproteins (LDLs) in blood is a hemoperfusion, when they are selectively retracted from plasma by an adsorber located outside the patient’s body. Recently, a photo-controllable smart surface was developed experimentally, that is characterized by high selectivity and reusability. It comprises a nanocarrier functionalised by a brush of azobenzene-containing polymer chains. We present a mesoscopic model that mimics principal features of this setup and focus our study on the role played by the length and flexibility of the chains and grafting density of a brush. The model for LDL comprises a spherical core covered by a shell of model phospholipids. The model is studied via coarse-grained molecular dynamics simulation, performed with the aid of the GMBOLDD package modified for the case of soft-core beads. We examined the dependencies of the binding energy on both the length of polymer chains and the grafting density of a brush and established optimal conditions for adsorption. These are explained by competition between the concentration of azobenzenes and phospholipids in the same spatial region, flexibility of polymer chains, and excluded volume effects.

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Unraveling the surface properties of PMMA/azobenzene blends as coating films with photoreversible surface polarity

Abstract: A repeated trans–cis isomerisation led to the random reorientation and arrangement of chromophores in PMMA/azobenzene blends as coating films.

Cited by 8 publications

References 56 publications

Red-light photoswitching of indigos in polymer thin films

Red-light photoswitching of indigos in polymer thin films

An Electron Spin Resonance Study Comparing Nanometer–Nanosecond Dynamics in Diblock Copolymers and Their Poly(methyl Methacrylate) Binary Blends

Adsorption of Low Density Lipoproteins on an Azobenzene-Containing Polymer Brush: Modelling by Coarse-Grained Molecular Dynamics

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