Aryl Amidine and Tertiary Amine Switchable Surfactants and Their Application in the Emulsion Polymerization of Methyl Methacrylate

Autor:	Michael F. Cunningham, Philip G. Jessop, Candace I. Fowler
Rok vydání:	2012
Předmět:	Polymers and Plastics Tertiary amine Aryl Organic Chemistry Emulsion polymerization Inorganic Chemistry Amidine chemistry.chemical_compound Colloid chemistry Pulmonary surfactant Polymer chemistry Materials Chemistry Particle size Methyl methacrylate
Zdroj:	Macromolecules. 45:2955-2962
ISSN:	1520-5835 0024-9297
Popis:	The switchability and bicarbonate formation of CO2 triggered aryl amidine and tertiary amine switchable surfactants have been investigated. Despite the lower basicity of these compounds compared to alkylacetamidine switchable surfactants, it was found that amidinium and ammonium bicarbonates could be formed in sufficiently high enough concentrations to perform emulsion polymerization of methyl methacrylate and stabilize the resulting colloidal latexes. Particle sizes ranging from 80 to 470 nm were obtained, and the effects of surfactant concentration, surfactant basicity, initiator type, initiator concentration, and CO2 pressure on particle size and ζ-potential have been examined. Destabilization of latexes is traditionally achieved by addition of salts, strong acids for anionically stabilized latexes, or alkalis for cationically stabilized latexes. However, with CO2-triggered switchable surfactants, only air and heat are required to destabilize the latex by removing CO2 from the system and switching the ...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3617c0494027827fe62772e92490f75d https://doi.org/10.1021/ma2027484 Zobrazit plný text záznamu