%0 Journal Article
%T Modeling of Intermediate Structures and Chain Conformation in Silica-Latex Nanocomposites Observed by SANS During Annealing
%+ Laboratoire Charles Coulomb (L2C)
%+ Matière Molle
%+ University of the Basque Country = Euskal Herriko Unibertsitatea (UPV / EHU)
%+ Institut Laue-Langevin (ILL)
%A Genix, Anne-Caroline
%A Tatou, Mouna
%A Imaz, Ainara
%A Forcada, Jacqueline
%A Schweins, Ralph
%A Grillo, Isabelle
%A Oberdisse, Julian
%< avec comité de lecture
%@ 0024-9297
%J Macromolecules
%I American Chemical Society
%V 45
%N 3
%P 1663-1675
%8 2012-02-01
%D 2012
%Z 1202.6466
%R 10.1021/ma202308c
%Z Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]Journal articles
%X The evolution of the polymer structure during nanocomposite formation and annealing of silica-latex nanocomposites is studied using contrast-variation small angle neutron scattering. The experimental system is made of silica nanoparticles (Rsi ≈ 8 nm) and a mixture of purpose-synthesized hydrogenated and deuterated nanolatex (Rlatex ≈ 12.5 nm). The progressive disappearance of the latex beads by chain interdiffusion and release in the nanocomposites is analyzed quantitatively with a model for the scattered intensity of hairy latex beads and an RPA description of the free chains. In silica-free matrices and nanocomposites of low silica content (7%v), the annealing procedure over weeks at up to Tg + 85 K results in a molecular dispersion of chains, the radius of gyration of which is reported. At higher silica content (20%v), chain interdiffusion seems to be slowed down on time-scales of weeks, reaching a molecular dispersion only at the strongest annealing. Chain radii of gyration are found to be unaffected by the presence of the silica filler.
%G English
%2 https://hal.science/hal-00674994/document
%2 https://hal.science/hal-00674994/file/Manuscript_Genix_Hall2.pdf
%L hal-00674994
%U https://hal.science/hal-00674994
%~ CNRS
%~ L2C
%~ MIPS
%~ UNIV-MONTPELLIER
%~ UM-2015-2021