2-(Diethyl)aminoethyl Methacrylate as a CO2-Switchable Comonomer for the Preparation of Readily Coagulated and Redispersed Polymer Latexes

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• 作者：Julien Pinaud ; Erica Kowal ; Michael Cunningham ; Philip Jessop
• 刊名：ACS Macro Letters
• 出版年：2012
• 出版时间：September 18, 2012
• 年：2012
• 卷：1
• 期：9
• 页码：1103-1107
• 全文大小：322K
• 年卷期：v.1,no.9(September 18, 2012)
• ISSN：2161-1653

文摘

CO₂ stimuli-responsive polystyrene latexes having a solids content of 27% were prepared in a surfactant-free emulsion polymerization (SFEP) under a CO₂ atmosphere, employing only commercially available chemical compounds: styrene, the initiator VA-061, and 0.54 mol % of the CO₂-switchable comonomer DEAEMA. The resulting polymer particles are 230鈥?00 nm in diameter and are monodisperse (PDI 鈮?0.054), as confirmed by DLS, TEM, and SEM. Although they are stable under a CO₂ atmosphere, the latexes can be easily destabilized by the bubbling of air through the sample at 40 掳C, allowing for recovery of the particles by filtration. Recovered polymer particles can be dried to powder and readily redispersed in carbonated water, yielding latexes with very similar zeta-potential and particle size as the original latexes. In addition, the bicarbonate salt of poly(DEAEMA) formed during the polymerization has been found to act as a CO₂-switchable flocculant, thus, facilitating the coagulation of the latex without altering the properties of the latex after redispersion.