Hybrid Composite Particles Research Articles

Titanium dioxide/P(St- co-DVB)-MAA hybrid composite particles prepared by dispersion polymerization

Inorganic core and polymer shell composite poly (styrene-co-divinylbenzene)-methacrylic acid (P(St- co-DVB)-MAA) particles were prepared by two-step dispersion polymerization. Fourier-transform IR spectroscopy and elemental analysis were used to measure the methacrylic acid content in the composites particles. X-ray measurement photoelectron spectroscopy (XPS) measurements indicated the presence of MAA units on the surface of the composite particles. The combined results of the elemental analysis and the XPS measurements showed that the copolymer on the surface of the poly (St- co-DVB)-MAA composite particles were rich in MAA, as compared with that in the interior of the composite particles. Field-emission scanning electron microscopy (FE-SEM) was used to study the morphology of the composite particles. The TGA results indicated that the encapsulation efficiency was as high as 76.9% and density ranged from 1.69 to 1.99 g/cm 3. The estimated density of the composite particles is 1.73 g/cm 3 due to the density matching with the suspending media.

Preparation of titanium dioxide/poly(methyl methacrylate‐co‐n‐butyl acrylate‐co‐methacrylic acid) hybrid composite particles via emulsion polymerization

AbstractTitanium dioxide core and polymer shell composite poly(methyl methacrylate‐co‐n‐butyl acrylate‐co‐methacrylic acid) [P(MMA‐BA‐MAA)] particles were prepared by emulsion copolymerization. The stability of dispersions of TiO2 particles in aqueous solution was investigated. The addition of an ionic surfactant, sodium lauryl sulfate, which can be absorbed strongly at the TiO2/aqueous interface, increases the stability of the TiO2 dispersion effectively by increasing the absolute value of the ζ potential of the TiO2 particles. The adsorption of the nonionic surfactant, Triton X‐100, on the surface of TiO2 particles is less than that of the ionic surfactant. Fourier transform IR spectroscopy was used to measure the content of MAA composite particles. Dynamic light scattering characterized the composite particle size and size distribution. The field‐emission scanning electron microscopy results for the composite particles showed a regular spherical shape, and no bare TiO2 was detected on the entire surface of the samples. The composite particles that were produced showed good spectral reflectance compared to bare TiO2. Thermogravimetric analysis results indicated the encapsulated TiO2 and estimated density of composite particles. There was up to 78.9% encapsulated TiO2 and the density ranged from 1.76 to 1.94 g/cm3. The estimated density of the composite particles is suitable at 1.73 g/cm3, which is due to density matching with the suspending fluid. The sedimentation experiment indicates that reducing the density mismatch between the composite particles and suspending fluid may enhance the stability. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 72–79, 2005

Carboxylic acid functional group containing inorganic core/polymer shell hybrid composite particles prepared by two-step dispersion polymerization

Titanium dioxide core and polymer shell composite particles were produced in two-step dispersion polymerization of methyl methacrylate (MMA), ethylene glycol dimethacrylate (EGDMA) and methacrylic acid (MAA). Fourier transforms IR (FT-IR) spectroscopy was used to measure the content of MAA composite particles. Dynamic light scattering (DLS) was characterized the composite particle size and size distribution. The field emission SEM (FE-SEM) result of the composite particles regular spherical shape and no bare TiO2 was detected on the whole surface of the samples. TGA results indicated that the encapsulated TiO2 and estimated density of composite particles. Encapsulated TiO2 was up to 85.4% and the density was ranged from 1.60 to 1.84g/cm3.

Preparation and characterization of titanium dioxide core and polymer shell hybrid composite particles prepared by two-step dispersion polymerization

Titanium dioxide core and polymer shell composite poly (styrene- co-divinylbenzene)-methacrylic acid [P (St- co-DVB)-MAA]] particles were prepared by two-step dispersion polymerization. Fourier transform IR spectroscopy and elemental analysis were used to measure the content of methacrylic acid in composites particles. X-ray measurement photoelectron spectroscopy (XPS) measurements indicated the presence of an MAA unit on the surface of the composite particles. The combined results of the elemental analysis and the XPS measurements showed that the copolymer on the surface of poly (St- co-DVB)-MAA composite particles was rich in MAA compared with that in the interior of the composite particles. Field-emission scanning electron microscopy (FE-SEM) was used to study the morphology characterization. The composite particles produced showing good spectral reflectance compare with bare TiO 2. TGA results indicated that the encapsulation efficiency and estimated density of composite particles. Encapsulation of TiO 2 was up to 87.4% and the density was ranged from 1.78 to 2.06 g/cm 3. Estimated density of the composite particles is suitable to 1.73 g/cm 3, due to density matching with suspending fluid.

Preparation and characterization of titanium dioxide core and polymer shell hybrid composite particles prepared by two-step dispersion polymerization

Preparation and characterization of titanium dioxide core and polymer shell hybrid composite particles prepared by two-step dispersion polymerization

Titanium dioxide core/polymer shell hybrid composite particles prepared by two-step dispersion polymerization

Titanium dioxide inorganic core and polymer shell composite poly(styrene- co-divinylbenzene)-methacrylic acid (P[St- co-DVB)-MAA]) particles were prepared by two-step dispersion polymerization. Fourier transform IR (FT-IR) spectroscopy and elemental analysis were used to measure the content of methacrylic acid in composites particles. X-ray measurement photoelectron spectroscopy (XPS) measurements indicated the presence of an methacrylic acid (MAA) unit on the surface of the composite particles. The combined results of the elemental analysis and the XPS measurements showed that the copolymer on the surface of P[(St- co-DVB)-MAA] composite particles was rich in MAA compared with that in the interior of the composite particles. Field emission scanning electron microscopy (FE-SEM) was used to study the morphology characterization. TGA results indicated that the encapsulation efficiency and estimated density of composite particles. Encapsulation efficiency was up to 87.4% and the density was ranged from 1.78 to 2.06 g/cm 3. Estimated density of the composite particles was suitable to 1.73 g/cm 3, due to density matching with suspending media.

Preparation and characterization of titanium dioxide core/polymer shell hybrid composite particles prepared by emulsion polymerization

AbstractTitanium dioxide inorganic core and polymer shell composite poly(methyl methacrylate‐co‐butylacrylate‐co‐methacrylic acid) [P(MMA‐co‐BA)‐MAA] particles were prepared by emulsion copolymerization. Fourier transform IR (FTIR) spectroscopy was used to measure the content of MAA composite particles. Dynamic light scattering (DLS) characterized the composite particle size and size distribution. The field emission SEM (FE‐SEM) results of the composite particles showed regular spherical shape and no bare TiO2 was detected on the whole surface of the samples. The composite particles were produced, showing good spectral reflectance compared with bare TiO2. TGA results indicated the encapsulation efficiency and estimated density of composite particles. Encapsulation efficiency was up to 78.9% and the density ranged from 1.76 to 1.94 g/cm3. Estimated density of the composite particles is suitable to 1.73 g/cm3, due to density matching with suspending media. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 2970–2975, 2004