Structural relaxation and dynamic heterogeneity in a polymer melt at attractive surfaces

被引：81

作者：

Smith, GD ^{[1
]}

Bedrov, D ^{[1
]}

Borodin, O ^{[1
]}

机构：

[1] Univ Utah, Dept Mat Sci & Engn, Salt Lake City, UT 84112 USA

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.90.226103

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Molecular dynamics simulations of polymer melts at flat and structured surfaces reveal that, for the former, slow dynamics and increased dynamic heterogeneity for an adsorbed polymer is due to densification of the polymer in a surface layer, while, for the latter, the energy topography of the surface plays the dominant role in determining dynamics of interfacial polymer. The dramatic increase in structural relaxation time for polymer melts at the attractive structured surface is largely the result of dynamic heterogeneity induced by the surface and does not resemble dynamics of a bulk melt approaching T-g.

引用

页数：4

共 21 条

[1]

[Anonymous], POLYM SURFACES INTER

[2] Influence of self-assembly on dynamical and viscoelastic properties of telechelic polymer solutions [J].

Bedrov, D ;

Smith, GD ;

Douglas, JF .

EUROPHYSICS LETTERS, 2002, 59 (03) :384-390

[3] Molecular-dynamics simulations of the thermal glass transition in polymer melts:: α-relaxation behavior [J].

Bennemann, C ;

Paul, W ;

Binder, K ;

Dunweg, B .

PHYSICAL REVIEW E, 1998, 57 (01) :843-851

[4] Restricted dynamics in polymer-filler systems [J].

Gagliardi, S ;

Arrighi, V ;

Ferguson, R ;

Telling, MTF .

PHYSICA B, 2001, 301 (1-2) :110-114

[5] Reduced polymer mobility near the polymer solid interface as measured by neutron reflectivity [J].

Lin, EK ;

Kolb, R ;

Satija, SK ;

Wu, WL .

MACROMOLECULES, 1999, 32 (11) :3753-3757

[6] Conjectures on the glass transition of polymers in confined geometries [J].

McCoy, JD ;

Curro, JG .

JOURNAL OF CHEMICAL PHYSICS, 2002, 116 (21) :9154-9157

[7]

SMITH GC, IN PRESS

[8] A molecular-dynamics simulation study of dielectric relaxation in a 1,4-polybutadiene melt [J].

Smith, GD ;

Borodin, O ;

Paul, W .

JOURNAL OF CHEMICAL PHYSICS, 2002, 117 (22) :10350-10359

[9] A molecular dynamics simulation study of the viscoelastic properties of polymer nanocomposites [J].

Smith, GD ;

Bedrov, D ;

Li, LW ;

Byutner, O .

JOURNAL OF CHEMICAL PHYSICS, 2002, 117 (20) :9478-9489

[10] On the non-Gaussianity of chain motion in unentangled polymer melts [J].

Smith, GD ;

Paul, W ;

Monkenbusch, M ;

Richter, D .

JOURNAL OF CHEMICAL PHYSICS, 2001, 114 (09) :4285-4288

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