A Remarkably Large Phase‐Transition Effect in a Random Copolymer of Oligo(ethylene glycol) Methyl Ether Methacrylate (OEGMA)500 Induced by the Photochemistry of the 2‐(Hydroxyimino)aldehyde Group

The effect of UV irradiation on the cloud points (CP) of aqueous solutions of a random 1:1 copolymer of oligo(ethylene glycol) methyl ether methacrylate (OEGMA500) and a 2‐(hydroxyimino)aldehyde (HIA) functionalized methacrylate is presented. CPs are determined by visible spectroscopy and dynamic li...

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Veröffentlicht in:Macromolecular chemistry and physics 2019-07, Vol.220 (13), p.n/a
Hauptverfasser: D’Acunzo, Francesca, Santis, Serena, Masci, Giancarlo, Nardi, Martina, Renzi, Polyssena, Sobolev, Anatoly Petrovich
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container_issue 13
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container_title Macromolecular chemistry and physics
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creator D’Acunzo, Francesca
Santis, Serena
Masci, Giancarlo
Nardi, Martina
Renzi, Polyssena
Sobolev, Anatoly Petrovich
description The effect of UV irradiation on the cloud points (CP) of aqueous solutions of a random 1:1 copolymer of oligo(ethylene glycol) methyl ether methacrylate (OEGMA500) and a 2‐(hydroxyimino)aldehyde (HIA) functionalized methacrylate is presented. CPs are determined by visible spectroscopy and dynamic light scattering (DLS). 1H and 13C NMR experiments are carried out in D2O and DMSO‐d6 on the polymer and on an HIA‐functionalized model of the photoresponsive repeat unit. UV‐irradiated solutions exhibit an unprecedented increase of the phase‐separation temperature for an OEGMA photoresponsive copolymer (10–22 °C, depending on concentration and irradiation conditions). Phase separation is reversible with little hysteresis. With both pristine and irradiated polymer solutions, aggregate dimensions are 100 nm form at the CP and gradually grow as temperature increases, whereas the light‐induced processes of the repeat unit model in DMSO‐d6 are well identified (e.g., oxime E/Z isomerization and Norrish‐Yang cyclization of the aldehyde moiety), it is not straightforward to extrapolate such behavior to the polymeric solution in water. The remarkably large phototriggered thermal effect in the present work motivates further investigations on the solvent‐dependent photochemistry of HIA as a promising functional group for the synthesis of multi‐stimuli responsive materials. Aqueous solutions of a 1:1 random copolymer of oligo(ethylene glycol) methyl ether methacrylate (OEGMA)500 with a methacrylate bearing the 2‐(hydroxyimino)aldehyde (HIA) functional group exhibit a remarkably large upward shift in cloud point upon photostimulation at 350 nm. The rich photochemistry of the HIA group, which may entail changes in dipole moments and hydrogen bonding patterns or trigger dark chemical reactions, is amenable for this effect.
doi_str_mv 10.1002/macp.201900200
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CPs are determined by visible spectroscopy and dynamic light scattering (DLS). 1H and 13C NMR experiments are carried out in D2O and DMSO‐d6 on the polymer and on an HIA‐functionalized model of the photoresponsive repeat unit. UV‐irradiated solutions exhibit an unprecedented increase of the phase‐separation temperature for an OEGMA photoresponsive copolymer (10–22 °C, depending on concentration and irradiation conditions). Phase separation is reversible with little hysteresis. With both pristine and irradiated polymer solutions, aggregate dimensions are &lt;10 nm (DLS) at room temperature. Aggregates of &gt;100 nm form at the CP and gradually grow as temperature increases, whereas the light‐induced processes of the repeat unit model in DMSO‐d6 are well identified (e.g., oxime E/Z isomerization and Norrish‐Yang cyclization of the aldehyde moiety), it is not straightforward to extrapolate such behavior to the polymeric solution in water. 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CPs are determined by visible spectroscopy and dynamic light scattering (DLS). 1H and 13C NMR experiments are carried out in D2O and DMSO‐d6 on the polymer and on an HIA‐functionalized model of the photoresponsive repeat unit. UV‐irradiated solutions exhibit an unprecedented increase of the phase‐separation temperature for an OEGMA photoresponsive copolymer (10–22 °C, depending on concentration and irradiation conditions). Phase separation is reversible with little hysteresis. With both pristine and irradiated polymer solutions, aggregate dimensions are &lt;10 nm (DLS) at room temperature. Aggregates of &gt;100 nm form at the CP and gradually grow as temperature increases, whereas the light‐induced processes of the repeat unit model in DMSO‐d6 are well identified (e.g., oxime E/Z isomerization and Norrish‐Yang cyclization of the aldehyde moiety), it is not straightforward to extrapolate such behavior to the polymeric solution in water. The remarkably large phototriggered thermal effect in the present work motivates further investigations on the solvent‐dependent photochemistry of HIA as a promising functional group for the synthesis of multi‐stimuli responsive materials. Aqueous solutions of a 1:1 random copolymer of oligo(ethylene glycol) methyl ether methacrylate (OEGMA)500 with a methacrylate bearing the 2‐(hydroxyimino)aldehyde (HIA) functional group exhibit a remarkably large upward shift in cloud point upon photostimulation at 350 nm. The rich photochemistry of the HIA group, which may entail changes in dipole moments and hydrogen bonding patterns or trigger dark chemical reactions, is amenable for this effect.</abstract><cop>Weinheim</cop><pub>Wiley Subscription Services, Inc</pub><doi>10.1002/macp.201900200</doi><tpages>7</tpages><orcidid>https://orcid.org/0000-0001-8709-7666</orcidid><orcidid>https://orcid.org/0000-0002-1326-8183</orcidid><orcidid>https://orcid.org/0000-0002-7213-8311</orcidid><orcidid>https://orcid.org/0000-0001-8024-2402</orcidid><orcidid>https://orcid.org/0000-0001-9772-2891</orcidid><orcidid>https://orcid.org/0000-0002-8857-8813</orcidid></addata></record>
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subjects 2‐(hydroxyimino)aldehydes
Aldehydes
amphiphilic copolymers
Aqueous solutions
cloud points
Copolymers
Ethylene glycol
Functional groups
Irradiation
Isomerization
NMR
Nuclear magnetic resonance
oligo(ethylene glycol)methacrylates
Phase separation
Phase transitions
Photochemistry
Photon correlation spectroscopy
Polymers
Temperature effects
Ultraviolet radiation
UV‐light
title A Remarkably Large Phase‐Transition Effect in a Random Copolymer of Oligo(ethylene glycol) Methyl Ether Methacrylate (OEGMA)500 Induced by the Photochemistry of the 2‐(Hydroxyimino)aldehyde Group
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