Objectif The main objective of the project is to understand the structure and nature of aggregates formed in aqueous solutions of industrially important ionic polysaccharides: chitosan and hydrophobically modified (HM) chitosan. The work consists of several tasks:1) to prepare a series of well characterized samples of HM chitosan with different content, chain length and degree of branching of hydrophobic alkyl side chains;2) to study experimentally and theoretically the nature of aggregates in aqueous solutions of charged unmodified chitosan which seem to be a peculiar feature for many charged polysaccharides;3) to study the self-association in aqueous solutions of HM chitosan with a particular attention to the search for finite size clusters recently predicted theoretically for any polyelectrolytes with associative groups;4) to study the kinetics of adsorption of HM chitosan on air/water interface in order to develop a new chromatographic procedure, which allows one to fractionate the hydrophobically associating macromolecules according to their degree of hydrophobicity;5) to investigate the self-association in the adsorption monolayers of HM chitosan submitted to a lateral compression with a particular attention to the role which is played by the interface in the formation of micelle-like aggregates.Five research teams (two from INTAS members and three from Russia) with complementary expertise will be involved in the project. Different experimental techniques (small-angle X-ray and neutron scattering, static and dynamic light scattering, fluorescence spectroscopy, tensiometry, monolayer technique) will be used. The experimental studies will be supported by theoretical investigations.These studies will permit to better understand a picture of various intermolecular interactions in associating ionic polysaccharides, which is important in the unfolding of numerous practical applications of these polymers. Programme(s) IC-INTAS - International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993- Thème(s) 3 - Chemistry OPEN - OPEN Call Appel à propositions Data not available Régime de financement Data not available Coordinateur Centre des Recherches sur les Macromolecules Vegetales Contribution de l’UE Aucune donnée Adresse Rue de la Chimie 601 38041 Grenoble Cedex 9 France Voir sur la carte Coût total Aucune donnée Participants (4) Trier par ordre alphabétique Trier par contribution de l’UE Tout développer Tout réduire M.V. Lomonosov Moscow State University Russie Contribution de l’UE Aucune donnée Adresse Vorobyovy Gory 117234 Moscow Voir sur la carte Coût total Aucune donnée Risoe National Laboratory Danemark Contribution de l’UE Aucune donnée Adresse Frederiksborgvej 399 4000 Roskilde Voir sur la carte Coût total Aucune donnée Russian Academy of Sciences Russie Contribution de l’UE Aucune donnée Adresse Vavilova St. 28 117813 Moscow Voir sur la carte Coût total Aucune donnée Russian Academy of Sciences Russie Contribution de l’UE Aucune donnée Adresse Prospekt Oktiabria 71 450054 Ufa Voir sur la carte Coût total Aucune donnée
