Preparation of polyacrylate–polysiloxane core–shell latex particles

✍ Scribed by Xiang Zheng Kong; Cheng You Kan; Qing Yuan

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 636 KB
• Volume: 7
• Category: Article
• ISSN: 1042-7147
• DOI: 10.1002/(sici)1099-1581(199612)7:12<888::aid-pat598>3.0.co;2-5

✦ Synopsis

Crosslinked polymer seed latexes of butyl ac ylate, methyl methac y l a f e and methac y l i c acid were synthesized with ethylene glycol dimethac ylate as a crosslinking agent in a first step. Three different processes of seeded emulsion polymerization were used to prepare an outlayer of polysiloxane on the above seed latex particles: (A) direct anionic polymerization of 0, (octamethyl tetracyclosiloxane) catalyzed by potassium hydroxide; ( B ) direct cationic polymerization of D, onto the seed catalyzed by dodecylbenzene sulfonic acid; (C) a vinyl-containing polysiloxane prepared by copolymerization of D, and vinyl septamethyl tetracyclosiloxane was added before the D, cationic polymerization. Characterization by transmission electron microscopy showed that only process C provided satisfacto y results. Film hardness was measured, and the latex film from process C demonstrated the lowest hardness of all the films. The mechanism of polymerization is discussed.