Ampholytic triblock terpolymer in dependence on pH value and solvent nature - hydrophobic association and electrostatic interactions
PMMA86-b-P(DEA190-co-MAA96)-b-PMMA86, poly(methyl methacrylate–b-(diethylamino)ethyl methacrylate-co-methacrylic acid)-b-methyl methacrylate), is a telechelic polymer composed of a hydrophilic ampholytic middle block and hydrophobic end blocks. Depending on pH value, the polymer can adopt different conformations as a result of the protonation/deprotonation equilibrium in the middle block upon pH variation. We aim to investigate the network formation mechanism in presence of two opposite effects: aggregation tendency of the hydrophobic outer blocks and electrostatic repulsion along the middle block. The latter will also be varied by changing the solvent nature. Addition of acetone alters the dielectric permittivity of the solvent and additionally enhances the solubility of the PMMA blocks, which has an impact on the structural characteristics of the obtained network. Static and kinetic experiments will be carried out.
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PAPADAKIS Christine; DYAKONOVA Margarita; GRILLO Isabelle; NIEBUUR Bart-Jan; RAFTOPOULOS Konstantinos and VISHNEVETSKAYA Natalya. (2015). Ampholytic triblock terpolymer in dependence on pH value and solvent nature - hydrophobic association and electrostatic interactions. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1734
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