Role of effective composition on dynamics of PEO-PMMA blends

Javier Sacristan; Chunxia Chen; Janna K. Maranas

doi:10.1021/ma8003373

Role of effective composition on dynamics of PEO-PMMA blends

Javier Sacristan, Chunxia Chen, Janna K. Maranas

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

We use molecular simulation to compare component dynamics of a poly(ethylene oxide) [PEO] and poly(methyl methacrylate) [PMMA] blend with that of a diblock copolymer of the same overall composition. The blend and the copolymer have different intermolecular packing, which leads to a difference in compositions defined over local length scales. These "effective concentrations" directly impact dynamic behavior through the chain connectivity model for blend dynamics, which is based on a single controlling length scale for dynamics equal to the Kuhn length. By comparing the change in dynamics expected on the basis of different effective concentrations with the actual change observed in the simulations, we find that this idea is quantitatively accurate for the PMMA component. For PEO, the controUing length scale for dynamics varies with the size of the observation volume.

Original language	English (US)
Pages (from-to)	5466-5476
Number of pages	11
Journal	Macromolecules
Volume	41
Issue number	14
DOIs	https://doi.org/10.1021/ma8003373
State	Published - Jul 22 2008

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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10.1021/ma8003373

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AB - We use molecular simulation to compare component dynamics of a poly(ethylene oxide) [PEO] and poly(methyl methacrylate) [PMMA] blend with that of a diblock copolymer of the same overall composition. The blend and the copolymer have different intermolecular packing, which leads to a difference in compositions defined over local length scales. These "effective concentrations" directly impact dynamic behavior through the chain connectivity model for blend dynamics, which is based on a single controlling length scale for dynamics equal to the Kuhn length. By comparing the change in dynamics expected on the basis of different effective concentrations with the actual change observed in the simulations, we find that this idea is quantitatively accurate for the PMMA component. For PEO, the controUing length scale for dynamics varies with the size of the observation volume.

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Role of effective composition on dynamics of PEO-PMMA blends

Abstract

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