Confined Dynamics of Grafted Polymer Chains in Solutions of Linear Polymer
| Autor: | Katy N. Olafson, Antonio Faraone, Laura Stingaciu, Ramanan Krishnamoorti, Ryan Poling-Skutvik, Suresh Narayanan, Jacinta C. Conrad |
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| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Quantitative Biology::Biomolecules Polymers and Plastics Polymer science Linear polymer Organic Chemistry Dynamics (mechanics) Relaxation (NMR) 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Condensed Matter::Soft Condensed Matter Inorganic Chemistry Solvent Viscosity chemistry.chemical_compound surgical procedures operative chemistry Materials Chemistry Osmotic pressure Polystyrene 0210 nano-technology |
| Zdroj: | Macromolecules. 50:7372-7379 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/acs.macromol.7b01245 |
| Popis: | We measure the dynamics of high molecular weight polystyrene grafted to silica nanoparticles dispersed in semidilute solutions of linear polymer. Structurally, the linear free chains do not penetrate the grafted corona but increase the osmotic pressure of the solution, collapsing the grafted polymer and leading to eventual aggregation of the grafted particles at high matrix concentrations. Dynamically, the relaxations of the grafted polymer are controlled by the solvent viscosity according to the Zimm model on short time scales. On longer time scales, the grafted chains are confined by neighboring grafted chains, preventing full relaxation over the experimental time scale. Adding free linear polymer to the solution does not affect the initial Zimm relaxations of the grafted polymer but does increase the confinement of the grafted chains. Our results elucidate the physics underlying the slow relaxations of grafted polymer. |
| Databáze: | OpenAIRE |
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