Miscible blend dynamics and the length scale of local compositions | Zendy

García Sakai Victoria | Zendy; Maranas Janna K. | Zendy; Chowdhuri Zema | Zendy; Peral Inmaculada | Zendy; Copley John R. D. | Zendy

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Miscible blend dynamics and the length scale of local compositions

Author(s) -

García Sakai Victoria,

Maranas Janna K.,

Chowdhuri Zema,

Peral Inmaculada,

Copley John R. D.

Publication year - 2005

Publication title -

journal of polymer science part b: polymer physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.65

H-Index - 145

eISSN - 1099-0488

pISSN - 0887-6266

DOI - 10.1002/polb.20562

Subject(s) - relaxation (psychology) , polymer blend , polymer , materials science , neutron scattering , polymer chemistry , scale (ratio) , dynamics (music) , thermodynamics , deuterium , chemical physics , scattering , chemistry , physics , copolymer , composite material , optics , nuclear physics , psychology , social psychology , quantum mechanics , acoustics

We consider the influence of a local, or effective, composition on dynamics in the miscible polymer blend PEO/PMMA. Quasielastic neutron scattering in combination with deuterium labeling is employed to determine characteristic relaxation times of the PEO component over spatial scales from 3 to 10 Å. Information about the distribution of relaxation times is obtained indirectly from the stretching parameters in a stretched exponential fit. We examine the behavior of these parameters with spatial scale and temperature, finding that their variation supports a distribution of PEO mobility in the blend which is far wider than pure PEO and narrows with decreasing temperature for small spatial scales. This is linked to the concept of local compositions defined over varying spatial scales, and indicates that the concept of a local composition, linked to PEO dynamics, is important in this system. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 2914–2923, 2005

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