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Modeling of Intermediate Structures and Chain Conformation in Silica–Latex Nanocomposites Observed by SANS During Annealing
- Source :
- Macromolecules, Macromolecules, American Chemical Society, 2012, 45 (3), pp.1663-1675. ⟨10.1021/ma202308c⟩
- Publication Year :
- 2012
- Publisher :
- American Chemical Society (ACS), 2012.
-
Abstract
- International audience; 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.
- Subjects :
- Materials science
Polymers and Plastics
Annealing (metallurgy)
FOS: Physical sciences
02 engineering and technology
Condensed Matter - Soft Condensed Matter
010402 general chemistry
01 natural sciences
Gyration
Inorganic Chemistry
Materials Chemistry
Latex beads
chemistry.chemical_classification
Nanocomposite
Organic Chemistry
Polymer
021001 nanoscience & nanotechnology
Small-angle neutron scattering
0104 chemical sciences
Chemical engineering
chemistry
Deuterium
Radius of gyration
Soft Condensed Matter (cond-mat.soft)
0210 nano-technology
[PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Subjects
Details
- ISSN :
- 15205835 and 00249297
- Volume :
- 45
- Database :
- OpenAIRE
- Journal :
- Macromolecules
- Accession number :
- edsair.doi.dedup.....d70ced3665b5daf49b9346c7b948fa0d