title: Interphase vs confinement in starch-clay bionanocomposites.
abstract: Starch-clay bionanocomposites containing 1-10% of natural montmorillonite were elaborated by melt processing in the presence of water. A complex macromolecular dynamics behavior was observed: depending on the clay content, an increase of the glass transition temperature and/or the presence of two overlapped α relaxation peaks were detected. Thanks to a model allowing the prediction of the average interparticle distance, and its comparison with the average size of starch macromolecules, it was possible to associate these phenomena to different populations of macromolecules. In particular, it seems that for high clay content (10%), the slowdown of segmental relaxation due to confinement of the starch macromolecules between the clay tactoïds is the predominant phenomenon. While for lower clay contents (3-5%), a significant modification of chain relaxation seems to occur, due to the formation of an interphase by the starch macromolecules in the vicinity of clay nanoparticles coexisting with the bulk polymer.
authors.affiliation: LUNAM Université, CNRS, GEPEA, UMR 6144, CRTT, 37, Boulevard de l'Université, 44606 St Nazaire Cedex, France; UR1268 Biopolymères Interactions Assemblages, INRA, F-44300 Nantes, France; Structure Fédérative IBSM, INRA Nantes-Angers, Rue de la Géraudière, BP 71627, 44316 Nantes Cedex 3. France. Electronic address: gildascoativy@gmail.com.
authors.forename: Gildas
authors.initials: G
authors.lastname: Coativy
authors.affiliation: UR1268 Biopolymères Interactions Assemblages, INRA, F-44300 Nantes, France; Structure Fédérative IBSM, INRA Nantes-Angers, Rue de la Géraudière, BP 71627, 44316 Nantes Cedex 3. France. Electronic address: chloe.chevigny@nantes.inra.fr.
authors.forename: Chloé
authors.initials: C
authors.lastname: Chevigny
authors.affiliation: UR1268 Biopolymères Interactions Assemblages, INRA, F-44300 Nantes, France; Structure Fédérative IBSM, INRA Nantes-Angers, Rue de la Géraudière, BP 71627, 44316 Nantes Cedex 3. France. Electronic address: agnes.sabate@nantes.inra.fr.
authors.forename: Agnès
authors.initials: A
authors.lastname: Rolland-Sabaté
authors.affiliation: LUNAM Université, CNRS, GEPEA, UMR 6144, CRTT, 37, Boulevard de l'Université, 44606 St Nazaire Cedex, France; Structure Fédérative IBSM, INRA Nantes-Angers, Rue de la Géraudière, BP 71627, 44316 Nantes Cedex 3. France. Electronic address: eric.leroy@univ-nantes.fr.
authors.forename: Eric
authors.initials: E
authors.lastname: Leroy
authors.affiliation: UR1268 Biopolymères Interactions Assemblages, INRA, F-44300 Nantes, France; Structure Fédérative IBSM, INRA Nantes-Angers, Rue de la Géraudière, BP 71627, 44316 Nantes Cedex 3. France. Electronic address: denis.lourdin@nantes.inra.fr.
authors.forename: Denis
authors.initials: D
authors.lastname: Lourdin
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry*; D001546:Bentonite / Q000737:chemistry; D000077215:Clay; D057927:Hydrophobic and Hydrophilic Interactions; D055595:Mechanical Phenomena; D008970:Molecular Weight; D053761:Nanocomposites / Q000737:chemistry*; D011198:Solanum tuberosum / Q000737:chemistry; D013213:Starch / Q000737:chemistry*; D013696:Temperature
chemical_list: D000538:Aluminum Silicates; D001546:Bentonite; D013213:Starch; D000077215:Clay
keywords: Clay; Confinement; Macromolecular dynamics; Nanocomposite; Starch