Surface modification of pH-responsive poly(2-(tertbutylamino) ethyl methacrylate) brushes grafted on mesoporous silica nanoparticles
Almeataq, Abdullah M. Alswieleh, Mufleh M. Alshahrani, Khalid E. Alzahrani, Hamdan S. Alghamdi, Abdurahman A Niazy, Abdulilah S Alsilme, Abeer M. Beagan, Bayan M. Alsheheri, Abdulaziz A. Alghamdi & Mohammed S. . 2019
Poly(2-(tert-butylamino)ethyl methacrylate) brushes (PTBAEMA) are grown from mesoporous silica
nanoparticles via surface-initiated atom transfer radical polymerization (SI-ATRP). Linear PTBAEMA
brushes are protonated and highly swollen at low pH; brushes are collapsed at pH higher than 7.7
due to deprotonation, as determined by dynamic light scattering (DLS).Quaternization of these brushes
is conducted using 2-iodoethanol in alkali media. DLS measurement of nanoparticles shows that
surface-confined quaternization occurs and produces pH-responsive brushes with a hydrophobic
upper surface. Variation of the 2-iodoethanol reaction time enables the mean degree of surface
quaternization. The pH-responsive behaviour of quaternized PTBEAMA brushes at 1 h reaction time
indicates low degrees of surface quaternization, dictated by the spatial location of 2-iodoethanol.
Almost uniformly quaternized brushes prepared when the conducted for 3 h and became less swollen
at low pH than brushes that conducted for 1 h. The intensity of the C − C − O component (286.5 eV) in
the C1s X-ray photoelectron spectrum increased, suggesting that the reaction with iodoethanol was
successful occurred.
In this study, Cu2+ perchlorate complexes of 3,5-dimetylpyrazole(dmpy), namely
[Cu(dmpy)3(H2O)2](H2O)(ClO4)2 (1), were prepared and characterized by X-ray diffraction (XRD),
…
This work presents the synthesis of pH-responsive poly(2-(diethylamino) ethyl methacrylate)
(PDEAEMA) brushes anchored on hollow mesoporous silica nanoparticles (HMSN-PDEAEMA)
via a…
This paper introduces the synthesis of well-defined 2-(tert-butylamino)ethyl
methacrylate-b-poly(ethylene glycol) methyl ether methacrylate diblock copolymer, which has
been grafted…