TY - JOUR
T1 - Water-dispersible silica-polyelectrolyte nanocomposites prepared via acid-triggered polycondensation of silicic acid and directed by polycations.
AU - Overton, Philip
AU - Danilovtseva, Elena
AU - Karjalainen, Erno
AU - Karesoja, Mikko
AU - Annenkov, Vadim
AU - Tenhu, Heikki
AU - Aseyev, Vladimir
N1 - Copyright (C) 2018 American Chemical Society (ACS). All Rights Reserved.; Section Code: 37-5; CA Section Cross-references: 35, 36; CODEN: POLYCK; CAS Registry Numbers: 201611-92-9 Role: RCT (Reactant), RACT (Reactant or reagent) (chain transfer agent; water-dispersible silica-polyelectrolyte nanocomposites prepd. via acid-triggered polycondensation of silicic acid and directed by polycations); 1344-09-8 Role: RCT (Reactant), RACT (Reactant or reagent) (precursor; water-dispersible silica-polyelectrolyte nanocomposites prepd. via acid-triggered polycondensation of silicic acid and directed by polycations); 25154-86-3P; 868828-97-1P Role: PRP (Properties), RCT (Reactant), SPN (Synthetic preparation), PREP (Preparation), RACT (Reactant or reagent) (water-dispersible silica-polyelectrolyte nanocomposites prepd. via acid-triggered polycondensation of silicic acid and directed by polycations); 7631-86-9P (Silica); 58903-78-9P; 1417861-81-4P Role: PRP (Properties), SPN (Synthetic preparation), PREP (Preparation) (water-dispersible silica-polyelectrolyte nanocomposites prepd. via acid-triggered polycondensation of silicic acid and directed by polycations); 74-88-4; 26915-72-0 Role: RCT (Reactant), RACT (Reactant or reagent) (water-dispersible silica-polyelectrolyte nanocomposites prepd. via acid-triggered polycondensation of silicic acid and directed by polycations); 2867-47-2 Role: RCT (Reactant), RACT (Reactant or reagent) (water-dispersible silica/polyelectrolyte nanocomposites prepd. via acid-triggered polycondensation of silicic acid and directed by polycations)
PY - 2016
Y1 - 2016
N2 - The present work describes the acid-triggered condensation of silicic acid, Si(OH)4, as directed by selected polycations in aq. soln. in the pH range of 6.5-8.0 at room temp., without the use of addnl. solvents or surfactants. This process resulted in the formation of silica-polyelectrolyte (S-PE) nanocomposites in the form of ppt. or water-dispersible particles. The mean hydrodynamic diam. (dh) of size distributions of the prepd. water-dispersible S-PE composites is presented as a function of the soln. pH at which the composite formation was achieved. Poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) and block copolymers of DMAEMA and oligo(ethylene glycol) Me ether methacrylate (OEGMA) were used as weak polyelectrolytes in S-PE composite formation. The activity of the strong polyelectrolytes poly(methacryloxyethyl trimethylammonium iodide) (PMOTAI) and PMOTAI-b-POEGMA in S-PE formation was also examd. The effect of polyelectrolyte strength and the OEGMA block on the formation of the S-PE composites was assessed with respect to the S-PE composites prepd. using the PDMAEMA homopolymer. In the presence of the PDMAEMA60 homopolymer (Mw = 9400 g/mol), the size of the dispersible S-PE composites increases with soln. pH in the range pH 6.6-8.1, from dh = 30 nm to dh = 800 nm. S-PDMAEMA60 prepd. at pH 7.8 contained 66% silica by mass (TGA). The increase in dispersible S-PE particle size was diminished when directed by PDMAEMA300 (Mw = 47,000 g/mol), reaching a max. of dh = 75 nm. S-PE composites formed using PDMAEMA-b-POEGMA remain in the range dh = 20-30 nm across this same pH regime. Pptd. S-PE composites were obtained as spheres of up to 200 nm in diam. (SEM) and up to 65% mass content of silica (TGA). The conditions of pH for the prepn. of dispersible and ppt. S-PE nanocomposites, as directed by the five selected polyelectrolytes PDMAEMA60, PDMAEMA300, PMOTAI60, PDMAEMA60-b-POEGMA38 and PMOTAI60-b-POEGMA38 was summarized.
AB - The present work describes the acid-triggered condensation of silicic acid, Si(OH)4, as directed by selected polycations in aq. soln. in the pH range of 6.5-8.0 at room temp., without the use of addnl. solvents or surfactants. This process resulted in the formation of silica-polyelectrolyte (S-PE) nanocomposites in the form of ppt. or water-dispersible particles. The mean hydrodynamic diam. (dh) of size distributions of the prepd. water-dispersible S-PE composites is presented as a function of the soln. pH at which the composite formation was achieved. Poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) and block copolymers of DMAEMA and oligo(ethylene glycol) Me ether methacrylate (OEGMA) were used as weak polyelectrolytes in S-PE composite formation. The activity of the strong polyelectrolytes poly(methacryloxyethyl trimethylammonium iodide) (PMOTAI) and PMOTAI-b-POEGMA in S-PE formation was also examd. The effect of polyelectrolyte strength and the OEGMA block on the formation of the S-PE composites was assessed with respect to the S-PE composites prepd. using the PDMAEMA homopolymer. In the presence of the PDMAEMA60 homopolymer (Mw = 9400 g/mol), the size of the dispersible S-PE composites increases with soln. pH in the range pH 6.6-8.1, from dh = 30 nm to dh = 800 nm. S-PDMAEMA60 prepd. at pH 7.8 contained 66% silica by mass (TGA). The increase in dispersible S-PE particle size was diminished when directed by PDMAEMA300 (Mw = 47,000 g/mol), reaching a max. of dh = 75 nm. S-PE composites formed using PDMAEMA-b-POEGMA remain in the range dh = 20-30 nm across this same pH regime. Pptd. S-PE composites were obtained as spheres of up to 200 nm in diam. (SEM) and up to 65% mass content of silica (TGA). The conditions of pH for the prepn. of dispersible and ppt. S-PE nanocomposites, as directed by the five selected polyelectrolytes PDMAEMA60, PDMAEMA300, PMOTAI60, PDMAEMA60-b-POEGMA38 and PMOTAI60-b-POEGMA38 was summarized.
KW - Polyelectrolytes (cationic
KW - water-dispersible silica-polyelectrolyte nanocomposites prepd. via acid-triggered polycondensation of silicic acid and directed by polycations)
KW - Polyoxyalkylenes Role: PRP (Properties)
KW - SPN (Synthetic preparation)
KW - PREP (Preparation) (poly((dimethylamino)ethyl methacrylate)-
KW - diblock
KW - Colloids
KW - Hydrodynamic radius
KW - Nanocomposites
KW - Nanoscale particle size
KW - Polymer morphology
KW - RAFT polymerization
KW - Zeta potential (water-dispersible silica-polyelectrolyte nanocomposites prepd. via acid-triggered polycondensation of silicic acid and directed by polycations)
KW - silica
KW - polyelectrolyte
KW - nanocomposite
KW - hydrodynamic
KW - diam
KW - property
U2 - 10.3390/polym8030096
DO - 10.3390/polym8030096
M3 - Article
SN - 2073-4360
VL - 8
JO - Polymers
JF - Polymers
IS - 3
M1 - 96
ER -