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 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