Enhancement on Stability of Nanosized Titanium Dioxide in Silicone Suspension Using Diblock Copolymer: Influence of Dispersant Structure

Surachet Toommee; Nisanart Traiphol

doi:10.4028/www.scientific.net/AMR.747.599

Paper Titles

Sintering and Mechanical Properties of Injection Molded Low Cost Ti Alloys
p.583

Fabrication of High Resolution Microstructures Using Micro Hot Embossing with a Precision Rapid Tooling
p.587

Space-Charge-Limited Bipolar Currents at High Fields in Polymer/C₆₀ Diodes: A Simple Model Description
p.591

Rheological Behavior and Extrudate Swell of Polypropylene/Silicon Carbide Composites
p.595

Enhancement on Stability of Nanosized Titanium Dioxide in Silicone Suspension Using Diblock Copolymer: Influence of Dispersant Structure
p.599

Ba_0.9 A_0.1TiO₃ (A = Al and Mg) Powders Synthesized by Solid State Reaction Technique and their Dielectric Properties
p.603

Natural Rubber-Toughened Polystyrene: Effects of Mixing Procedure and Maleic Anhydride Content on Impact Property and Phase Morphology
p.607

The Sequential Analysis of Film Deformation Behavior during Successive Biaxial Stretching Process
p.611

Effects of Passes on Equal Channel Angular Pressing of 6061 Aluminium Alloy
p.615

HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 747Enhancement on Stability of Nanosized Titanium...

Enhancement on Stability of Nanosized Titanium Dioxide in Silicone Suspension Using Diblock Copolymer: Influence of Dispersant Structure

Abstract:

This research investigates using of poly (dimethylsiloxane-b-hydroxy ethyl acrylate) (PDMS-b-PHEA) diblock copolymer to stabilized TiO₂ nanoparticles in silicone fluid. The polar PHEA segment is expected to anchor on TiO₂ surface while the non-polar PDMS segment extends into silicone medium. To study effects of polymer structure on its stabilizing efficiency, PDMS-b-PHEA of structures 5-b-0.3, 5-b-1.1 and 8-b-1.0 are used. Results show that suspensions of particle with surface area ~40 and ~200 m²/g can be stabilized for longer than 1 and 7 hrs, respectively. The copolymer with relatively long PHEA and PDMS segments is highly effective as a dispersant. This is due to enhanced adsorption on particle surface and steric stabilization. However, in the system of 40 m²/g-TiO₂, excess amounts could lead to polymer entanglement and particle agglomeration. The copolymer dispersant exhibits high efficiency for the 200 m²/g-TiO₂suspension as well. In the latter system, higher concentration is required to effectively cover particle surface.