STRUCTURE AND THERMODYNAMICS OF BULK HOMOPOLYMER SOLID INTERFACES - A SITE LATTICE MODEL APPROACH

被引：113

作者：

THEODOROU, DN ^{[1
]}

机构：

[1] UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720

来源：

MACROMOLECULES | 1988年 / 21卷 / 05期

关键词：

PLASTICS - Surfaces - SOLIDS - Surfaces - THERMODYNAMIC PROPERTIES - THERMODYNAMICS;

D O I：

10.1021/ma00183a036

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A site lattice model for pure homopolymers at interfaces is derived, based on J. M. Scheutjens and G. J. Fleer's formulation for polymer solutions. Techniques are developed for the exploration of bond orientational characteristics at the interface. The model is implemented for monodisperse homopolymer systems of various molecular weights. Surface free energy is found to increase with chain length, as a result of entropic constraints at the interface. Bond orientation deviates from isotropy only within a narrow interfacial region, approximately six lattice layers (25 Angstrom) thick; it alternates from layer to layer between a parallel and a perpendicular arrangement with respect to the surface.

引用

页码：1400 / 1410

页数：11

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