Synthesis of multiblock ionomers by copolymerization in inverse microemulsions

Citation
F. Essler et F. Candau, Synthesis of multiblock ionomers by copolymerization in inverse microemulsions, COLLOID P S, 279(5), 2001, pp. 405-412
Citations number
28
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
COLLOID AND POLYMER SCIENCE
ISSN journal
0303402X → ACNP
Volume
279
Issue
5
Year of publication
2001
Pages
405 - 412
Database
ISI
SICI code
0303-402X(200105)279:5<405:SOMIBC>2.0.ZU;2-8
Abstract
The synthesis of ionomers with randomly distributed ionic blocks was achiev ed by free radical copolymerization of a hydrophobic monomer with an ionic comonomer in inverse microemulsions. The ionic monomer, sodium acrylate (ap proximately 1 mol% based on the monomer feed) is encapsulated in the aqueou s compartments of inverse micelles of sodium bis-(2-ethylhexyl)sulfosuccina te. The hydrophobic monomer, methyl methacrylate or butyl acrylate, is diss olved together with the initiator in the oil continuous phase (toluene). Fo r a given hydrophobe/ionic monomer ratio, it is possible to tune the length of the ionic block in the ionomer by adjusting the initial number of ionic monomers per water droplet, N-H The ionomers were obtained in their Na sal t form and converted thereafter into Ca salts. Differential scanning calori metry measurements performed on both series show a decrease in the glass-tr ansition temperature for the Ca-poly(methyl methacrylate) ionomers upon inc reasing N-H The results are discussed in terms of the nature of the counter ion and of the ionomer microstructure.