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Encapsulation of inorganic particles...

Erdem, Bedri.

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Encapsulation of inorganic particles via miniemulsion polymerization.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Encapsulation of inorganic particles via miniemulsion polymerization./
Author:	Erdem, Bedri.
Description:	356 p.
Notes:	Source: Dissertation Abstracts International, Volume: 60-12, Section: B, page: 6132.
Contained By:	Dissertation Abstracts International60-12B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9955148
ISBN:	0599584807

Encapsulation of inorganic particles via miniemulsion polymerization.
Erdem, Bedri.

Encapsulation of inorganic particles via miniemulsion polymerization. - 356 p.

Source: Dissertation Abstracts International, Volume: 60-12, Section: B, page: 6132.

Thesis (Ph.D.)--Lehigh University, 2000.

The application of the miniemulsion polymerization approach to the encapsulation of size titanium dioxide (TiO2) particles in polystyrene latex particles was investigated. Successful encapsulations were only achieved when the TiO2 particles, either hydrophilic or hydrophobic, were adequately dispersed in the styrene monomer prior to formation and polymerization of the miniemulsions. Dispersion of the inorganic particles in the oil medium was carried out using OLOA370 (polybutene-succinimide diethyl triamine), Solsperse 3000 (polyester) and Solsperse 24,000 (polyester-polyamine block copolymer) stabilizers and the use of an ultrasonifier. The use of the functional stabilizer OLOA370 provided the best dispersion stability and smallest particle size (Dv = 41--44 nm). Dynamic light scattering, employed in monitoring the particle size and its change with time at room temperature and the reaction temperature (70°C), revealed that the better dispersion stability and smallest particle sizes could be obtained with the hydrophilic TiO2 particles. Optimum conditions for preparing the dispersion were determined to be 1.0 wt% of the stabilizer and 20 minute sonification at maximum power. Surface characterization of both TiO2 particles (hydrophilic and hydrophobic) by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy showed the presence of hydroxyl groups on their surfaces, thus providing sites for interaction with the amine groups of the stabilizers. Miniemulsions were prepared from the stable dispersions of TiO2 particles in monomer using sodium lauryl sulfate (SLS) as surfactant, hexadecane as costabilizer, and polystyrene to enhance the nucleation of the droplets containing the TiO2 particles. The latexes resulting from the subsequent polymerizations were characterized in terms of the encapsulation efficiencies (via density gradient column separations) and the particle size. The use of the hydrophilic titanium dioxide particles resulted in better encapsulation efficiencies (&sim;82 wt% TiO 2 Particles and &sim;75 wt% polystyrene) as compared to the hydrophobic particles. The good results obtained with the hydrophilic TiO2 particles were attributed to the small particle size and improved dispersion stability of the TiO2 particles the monomer.

ISBN: 0599584807Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Encapsulation of inorganic particles via miniemulsion polymerization.
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245 1 0 $a Encapsulation of inorganic particles via miniemulsion polymerization.
300 $a 356 p.
500 $a Source: Dissertation Abstracts International, Volume: 60-12, Section: B, page: 6132.
500 $a Adviser: Mohamed S. El-Aasser.
502 $a Thesis (Ph.D.)--Lehigh University, 2000.
520 $a The application of the miniemulsion polymerization approach to the encapsulation of size titanium dioxide (TiO2) particles in polystyrene latex particles was investigated. Successful encapsulations were only achieved when the TiO2 particles, either hydrophilic or hydrophobic, were adequately dispersed in the styrene monomer prior to formation and polymerization of the miniemulsions. Dispersion of the inorganic particles in the oil medium was carried out using OLOA370 (polybutene-succinimide diethyl triamine), Solsperse 3000 (polyester) and Solsperse 24,000 (polyester-polyamine block copolymer) stabilizers and the use of an ultrasonifier. The use of the functional stabilizer OLOA370 provided the best dispersion stability and smallest particle size (Dv = 41--44 nm). Dynamic light scattering, employed in monitoring the particle size and its change with time at room temperature and the reaction temperature (70°C), revealed that the better dispersion stability and smallest particle sizes could be obtained with the hydrophilic TiO2 particles. Optimum conditions for preparing the dispersion were determined to be 1.0 wt% of the stabilizer and 20 minute sonification at maximum power. Surface characterization of both TiO2 particles (hydrophilic and hydrophobic) by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy showed the presence of hydroxyl groups on their surfaces, thus providing sites for interaction with the amine groups of the stabilizers. Miniemulsions were prepared from the stable dispersions of TiO2 particles in monomer using sodium lauryl sulfate (SLS) as surfactant, hexadecane as costabilizer, and polystyrene to enhance the nucleation of the droplets containing the TiO2 particles. The latexes resulting from the subsequent polymerizations were characterized in terms of the encapsulation efficiencies (via density gradient column separations) and the particle size. The use of the hydrophilic titanium dioxide particles resulted in better encapsulation efficiencies (&sim;82 wt% TiO 2 Particles and &sim;75 wt% polystyrene) as compared to the hydrophobic particles. The good results obtained with the hydrophilic TiO2 particles were attributed to the small particle size and improved dispersion stability of the TiO2 particles the monomer.
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