Dynamic Heterogeneity in Fully Miscible Blends of Polystyrene with Oligostyrene

被引：35

作者：

Harmandaris, Vagelis A. ^{[3
,4
]}

Kremer, Kurt ^{[2
]}

Floudas, George ^{[1
,2
]}

机构：

[1] Univ Ioannina, Dept Phys, GR-45110 Ioannina, Greece

[2] Max Planck Inst Polymer Res, D-55128 Mainz, Germany

[3] Univ Crete, Dept Appl Math, GR-71110 Iraklion, Greece

[4] IACM FORTH, GR-71110 Iraklion, Greece

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 16期

关键词：

POLYMER BLENDS; SEGMENTAL DYNAMICS; COMPONENT DYNAMICS; PRESSURE; RELAXATION; METHACRYLATE); TEMPERATURE; SIMULATIONS; DIFFUSION; SYSTEMS;

D O I：

10.1103/PhysRevLett.110.165701

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Binary blends of polystyrene with oligostyrene are perfectly miscible (chi = 0) yet dynamically heterogeneous. This is evidenced by independent probing of the dipole relaxation perpendicular to the backbone by dielectric spectroscopy and molecular dynamics. The self-concentration model with a single intramolecular length scale qualitatively describes the slower segmental dynamics. A quantitative comparison based on MD, however, requires a composition-dependent length scale. The pertinent dynamic length scale that best describes the slow segmental dynamics in miscible blends relates to both intra-and intermolecular contributions. DOI: 10.1103/PhysRevLett.110.165701

引用

页数：5

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