Characterization of the Core-Shell Nanoparticles Formed as Soluble Hydrogen﷓Bonding Interpolymer Complexes at low pHReport as inadecuate




Characterization of the Core-Shell Nanoparticles Formed as Soluble Hydrogen﷓Bonding Interpolymer Complexes at low pH - Download this document for free, or read online. Document in PDF available to download.

1 Department of Chemical Engineering 2 FORTH-ICE-HT - Institute of Chemical Engineering and High Temperature Chemical Processes, 3 L2PIC - Laboratoire Polymères, Propriétés aux Interfaces et Composites 4 LCVN - Laboratoire des colloïdes, verres et nanomatériaux 5 LLB - UMR 12 - Laboratoire Léon Brillouin

Abstract : The formation of soluble hydrogen-bonding interpolymer complexes between polyacrylic acid PAA and polyacrylic acid-co-2-acrylamido-2-methyl-1-propane sulfonic acid-graft-polyN, N dimethylacrylamide PAA-co-AMPSA-g-PDMAM at pH = 2.0 was studied. A viscometric study showed that in semidilute solution a physical gel is formed, due to the interconnection of the anionic PAA-co-AMPSA backbone of the graft copolymer, in a transient network, by means of the complexes formed between the PDMAM side chains of the graft copolymer and PAA. Dynamic and static light scattering measurements, in conjunction with small angle neutron scattering measurements, suggest the formation of core-shell colloidal nanoparticles in dilute solution, comprised by an insoluble PAA-PDMAM core surrounded by an anionic PAA-co-AMPSA corona. Even if larger clusters are formed in semidilute solution, the size of the insoluble core remains practically stable. Atomic force microscopy performed under ambient conditions, reveal that the particles collapse and flatten upon deposition on a substrate, with dimensions close to the ones of the dry hydrophobic core.

Keywords : polyelectrolyte graft copolymer rheology light scattering small angle neutron scattering





Author: Maria Sotiropoulou - Frederic Bossard - Eric Balnois - Julian Oberdisse - Georgios Staikos -

Source: https://hal.archives-ouvertes.fr/



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