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Exchange Lifetimes of the Bound Polymer Layer on Silica Nanoparticles
- Source :
- ACS Macro Letters, ACS Macro Letters, Washington, D.C : American Chemical Society, 2019, 8 (2), pp.166-171. ⟨10.1021/acsmacrolett.8b00877⟩, ACS Macro Letters, 2019, 8 (2), pp.166-171. ⟨10.1021/acsmacrolett.8b00877⟩
- Publication Year :
- 2022
-
Abstract
- International audience; Understanding the structure and dynamics of the bound polymer layer (BL) that forms on favorably interacting nanoparticles (NPs) is critical to revealing the mechanisms responsible for material property enhancements in polymer nanocomposites (PNCs). Here we use small angle neutron scattering to probe the temporal persistence of this BL in the canonical case of poly(2-vinylpyridine) (P2VP) mixed with silica NPs at two representative temperatures. We have observed almost no long-term reorganization at 150 °C (∼Tg,P2VP + 50 °C), but a notable reduction in the BL thickness at 175 °C. We believe that this apparently strong temperature dependence arises from the polyvalency of the binding of a single P2VP chain to a NP. Thus, while the adsorption–desorption process of a single segment is an activated process that occurs over a broad temperature range, the cooperative nature of requiring multiple segments to desorb converts this into a process that occurs over a seemingly narrow temperature range.
- Subjects :
- chemistry.chemical_classification
[PHYS]Physics [physics]
Materials science
Polymers and Plastics
Polymer nanocomposite
Organic Chemistry
Nanoparticle
02 engineering and technology
Polymer
Atmospheric temperature range
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Small-angle neutron scattering
0104 chemical sciences
Inorganic Chemistry
Silica nanoparticles
chemistry
Chemical engineering
Desorption
Materials Chemistry
[PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
0210 nano-technology
Layer (electronics)
[PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Subjects
Details
- ISSN :
- 21611653
- Volume :
- 8
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- ACS macro letters
- Accession number :
- edsair.doi.dedup.....f7924554d7ca04e01c5db87f80cf3689