Macromolecular Diffusion in a Crowded Polymer Nanocomposite

Autor:	Barbara A. Wood, Sangah Gam, Michelle E. Seitz, Karen I. Winey, Jeffrey S. Meth, Russell J. Composto, Changzai Chi, Nigel Clarke, Steve G. Zane
Rok vydání:	2011
Předmět:	Nanocomposite Polymers and Plastics Polymer nanocomposite Organic Chemistry Analytical chemistry Concentration effect Inorganic Chemistry Matrix (chemical analysis) Elastic recoil detection chemistry.chemical_compound chemistry Materials Chemistry Radius of gyration Polystyrene Diffusion (business)
Zdroj:	Macromolecules. 44:3494-3501
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma102463q
Popis:	Macromolecular motion is reduced in crowded polymer nanocomposites. Tracer diffusion is measured for deuterated polystyrene (dPS) into a polystyrene (PS):silica nanoparticle (NP) matrix using elastic recoil detection. This nanocomposite is ideal for studying diffusion in a crowded system because the interparticle distance (ID) that defines confinement can be varied from much greater than to much less than the size of the dPS chain, which is described by 2Rg, the radius of gyration, and varies from 10 to 40 nm in this study. Diffusion is observed to be significantly slower than that predicted by the Maxwell model. The tracer diffusion coefficient of dPS in the nanocomposite relative to the pure PS matrix (D/D0) plotted against the NP separation relative to probe size (i.e., ID/2Rg) falls on a master curve, indicating that crowding is a property of both the dPS size and confinement in the nanocomposite. Moreover, the normalized diffusion coefficient decreases more rapidly when ID/2Rg is less than ∼1, sugges...
Databáze:	OpenAIRE
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