Effect of soluble polymer binder on particle distribution in a drying particulate coating

被引：70

作者：

Buss, Felix ^{[2
]}

Roberts, Christine C. ^{[1
]}

Crawford, Kathleen S. ^{[1
]}

Peters, Katharina ^{[2
]}

Francis, Lorraine F. ^{[1
]}

机构：

[1] Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA

[2] KIT, Inst Thermal Proc Engn, D-76131 Karlsruhe, Baden Wurttembe, Germany

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2011年 / 359卷 / 01期

基金：

美国国家科学基金会;

关键词：

Coatings; Particles; Drying; Sedimentation; Diffusion; EVAPORATION; MIGRATION; GROWTH; SIZE;

D O I：

10.1016/j.jcis.2011.03.054

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Soluble polymer is frequently added to inorganic particle suspensions to provide mechanical strength and adhesiveness to particulate coatings. To engineer coating microstructure, it is essential to understand how drying conditions and dispersion composition influence particle and polymer distribution in a drying coating. Here, a 1D model revealing the transient concentration profiles of particles and soluble polymer in a drying suspension is proposed. Sedimentation, evaporation and diffusion govern particle movement with the presence of soluble polymer influencing the evaporation rate and solution viscosity. Results are summarized in drying regime maps that predict particle accumulation at the free surface or near the substrate as conditions vary. Calculations and experiments based on a model system of poly(vinyl alcohol) (PVA), silica particles and water reveal that the addition of PVA slows the sedimentation and diffusion of the particles during drying such that accumulation of particles at the free surface is more likely. (C) 2011 Elsevier Inc. All rights reserved.

引用

页码：112 / 120

页数：9

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