Submicron Sized Hollow Polymer Particles: Preparation and Properties |
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Authors: | Valery N Pavlyuchenko Olga V Sorochinskaya Oleg N Primachenko Sergey S Ivanchev |
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Institution: | St-Petersburg Department of the Boreskov Institute of Catalysis of the Siberian Branch of the Russian Academy of Sciences, 14, prospect Dobrolubova, 197198, St-Petersburg, Russia, Fax: +7 (812) 2330002 |
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Abstract: | The considered method for obtaining hollow polymer particles is based on the following pathway: (1) preparation of a carboxylated core latex by emulsion copolymerization of acrylic monomers with methacrylic acid, (2) synthesis of a core-shell latex comprising a styrene (co)polymer shell, (3) neutralization of the core carboxylic groups with a base followed by the core ionization and hydration to a high degree, shell expansion and formation of water-filled hollows. A number of approaches to improve the hydrophilic core – hydrophobic shell compatibility and enlarge the hollow volume are considered. The synthesized hollow particles are of a submicron size with the relative hollow volume Vhol : Vpart.= 0.43 – 0.64. Methods for cationic hollow particle latex preparation by anionic latex recharging with a cationic surfactant or acidic melamine resin are discussed. Recharging with a melamine resin is shown to afford hollow particles with an external polymer shell providing a high thermal stability of the particles. |
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Keywords: | (co)polymerization core-shell hollows particles thermal stability |
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