Synthesis of SiO₂/PS composite particles via emulsion polymerization

Abstract

SiO 2 particles prepared by Stö ber method were modified using 1, 3,5,3,5,, and SiO 2 /polystyrene (PS) composite particles with core-shell structure were synthesized adopting mulsion polymerization of PS in a water-ethanol medium. The products were characterized by infrared spectra, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and Zetasizer analyzer. The average diameter of SiO 2 particles prepared by Stö ber method was about 80 nm, the SiO 2 particles were modified using the molar ratio of Vi-D 4 and SiO 2 particles 1 : 10 (the dosage of Vi-D 4 benever too much), and the size of modified silica particles was about 90 nm. The infrared spectra indicated that the Vi-D 4 had bonded to the silanol groups on surface of SiO 2 particles, and XPS indicated the grafting efficiency of Vi-D 4 on surface of SiO 2 particles had reached 90%. The infrared spectra indicated the PS had been incorporated with SiO 2 particles, and TEM indicated the composite particles have obvious core-shell structure. The suitable size of SiO 2 particles should be lower than 200 nm, and the optimum volume ratio of ethanol and water should be 1 : 9 or 1 : 4. A kind of monodisperse SiO 2 /PS composite particles having function of self-assembling was successfully and effectively synthesized.

Addressing the Osteoporosis Problem—Multifunctional Injectable Hybrid Materials for Controlling Local Bone Tissue Remodeling

“…Because the peak intensities in the XPS spectra are directly related to the atomic distribution of material’s surface, they can be used to quantify the composition of atomic elements. 24 The XPS spectra of SiO 2 –Ap and SiO 2 –Ap–ALN are depicted in Figure S2 ( Supporting Information ), while the atomic compositions (%) of the surface of the obtained particles are presented in Table S1 . The peaks observed can be assigned to O 1s (533 eV), N 1s (401 eV), Ca 2p (349 eV), C 1s (286 eV), P 2p (134 eV), and Si 2p (105 eV), respectively.…”

Agglomeration-Free Preparation of Modified Silica Nanoparticles for Emulsion Polymerization—A Well Scalable Process

“…Composite particles with core–shell structures can be synthesized using different polymerization methods, for example, dispersion − and emulsion − polymerizations, mini emulsion polymerization, , reversible addition fragmentation chain transfer (RAFT) polymerization, , atom transfer radical polymerization (ATRP), or living anionic polymerization . During these procedures, the formation of monomers containing micelles results in monodisperse composite particles with core–shell structures.…”

“…In their experiments, they used MPS-modified silica particles, sodium dodecyl benzene sulfonate as the emulsifier, and potassium persulfate (KPS) as the initiator . Han et al used 1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane-modified silica particles in different sizes for the successful synthesis of silica–polystyrene core–shell particles by emulsion polymerization . In recent studies, Yang et al synthesized core–shell particles via the encapsulation of vinyltriethoxysilane-modified silica using SDS as the emulsifier and KPS as the initiator for emulsion polymerization .…”

Formulation of nanoscale copolymer-SiO2 dispersion via miniemulsion polymerization for application in white inkjet ink

“…To overcome this problem, various techniques such as in-situ polymerization (Gil and Casagrande, 2007;Hashemi-Nasab and Mirabedini, 2013;Sondi et al, 2000), emulsion polymerization (Han et al, 2011;Reculusa et al, 2004) and polymer-encapsulated SiO 2 (Chalaye et al, 2001;Huang et al, 1995) have been developed over years, but the poor stability of SiO 2 dispersion still remained which is a disadvantage of high-quality white inkjet ink (Giesche and Matijević, 1994;Huang et al, 1995). Preparation of polymer-encapsulated SiO 2 (polymer-SiO 2 ) via miniemulsion polymerization has been regarded as the most promising method to improve the stability of SiO 2 dispersion (Tissot et al, 2001;Xiong et al, 2002).…”