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Encapsulation of inorganic particles...

Al-Ghamdi, Ghurmallah Hussain.

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Encapsulation of inorganic particles via miniemulsification and film formation of resulting composite latex particles.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Encapsulation of inorganic particles via miniemulsification and film formation of resulting composite latex particles./
Author:	Al-Ghamdi, Ghurmallah Hussain.
Description:	288 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1746.
Contained By:	Dissertation Abstracts International64-04B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3086929

Encapsulation of inorganic particles via miniemulsification and film formation of resulting composite latex particles.
Al-Ghamdi, Ghurmallah Hussain.

Encapsulation of inorganic particles via miniemulsification and film formation of resulting composite latex particles. - 288 p.

Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1746.

Thesis (Ph.D.)--Lehigh University, 2003.

The application of the miniemulsification process to the encapsulation of TiO2 particles in polymer/copolymer particles was investigated. Dispersion studies have shown that Solsperse 32,000 was selected as the best stabilizer for TiO2 particles. Then, the encapsulation of 3 wt% TiO2 particles (hydrophilic) stabilized with 1 wt% Solsperse 32,000 in PS, PBA and 50:50 wt% a styrene/<italic>n</italic>-butyl acrylate (St/BA) copolymer via miniemulsion polymerization was investigated. The encapsulation efficiency and the contrast ratio (CR) results have shown clearly the limitations of this approach.Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Encapsulation of inorganic particles via miniemulsification and film formation of resulting composite latex particles.
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035 $a (UnM)AAI3086929
035 $a AAI3086929
040 $a UnM $c UnM
100 1 $a Al-Ghamdi, Ghurmallah Hussain. $3 1946621
245 1 0 $a Encapsulation of inorganic particles via miniemulsification and film formation of resulting composite latex particles.
300 $a 288 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1746.
500 $a Adviser: Mohamed S. El-Aasser.
502 $a Thesis (Ph.D.)--Lehigh University, 2003.
520 $a The application of the miniemulsification process to the encapsulation of TiO2 particles in polymer/copolymer particles was investigated. Dispersion studies have shown that Solsperse 32,000 was selected as the best stabilizer for TiO2 particles. Then, the encapsulation of 3 wt% TiO2 particles (hydrophilic) stabilized with 1 wt% Solsperse 32,000 in PS, PBA and 50:50 wt% a styrene/<italic>n</italic>-butyl acrylate (St/BA) copolymer via miniemulsion polymerization was investigated. The encapsulation efficiency and the contrast ratio (CR) results have shown clearly the limitations of this approach.
520 $a Miniemulsification was used successfully as an alternative approach to encapsulate TiO2 particles inside a St/BA copolymer with high loading levels [11% PVC (pigment volume concentration) to 70% PVC]. CR measurements for all batches showed that a 3 mil (1 mil equals 25 μm) film thickness, which was obtained for the 43% PVC, is the minimum thickness at which 98% CR can be achieved. Also, the highest hiding power (HP) (534.72 ft<super> 2</super>/gal) was obtained at 43% PVC. Gloss measurements at showed that as the TiO2 loading increased, the gloss decreased.
520 $a A comparative study was made between the optical properties of the films cast from encapsulated latex particles with films cast from blends at the same TiO2 loading and film thickness for 11%, 20%, and 43% PVC systems. The CR results showed clearly the superiority of the miniemulsification process over physical blends in all three batches in terms of their hiding ability (98% CR) at low film thickness (3 mil for 43% PVC), while with blending, 98% CR could be obtained only at a high film thickness (7 mils). Gloss measurements showed that the gloss of the latex films at various thicknesses prepared by miniemulsification technique is higher than those obtained from the blends.
520 $a A density gradient column (DGC) for 11%, 20%, and 30% PVCs was prepared successfully using a dense liquid, sodium polytungstate (SPT). The encapsulation efficiencies for 11%, 20%, and 30% PVCs were found to be 100% TiO2 encapsulated inside 86.3%, 98%, and 98.9% of the copolymer, respectively. The unencapsulated copolymer for all three batches was found in the 1.04 g/ml density layer of the DGC and was decreased as the TiO2 loading increased. Particle size analysis results showed that encapsulated particle size increased with increasing density in the DGC.
590 $a School code: 0105.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0495
690 $a 0542
690 $a 0794
710 2 0 $a Lehigh University. $3 515436
773 0 $t Dissertation Abstracts International $g 64-04B.
790 1 0 $a El-Aasser, Mohamed S., $e advisor
790 $a 0105
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3086929