Electrophoresis of functionalized microgels: morphological insights

被引:59
作者
Hoare, T [1 ]
Pelton, R [1 ]
机构
[1] McMaster Univ, Pulp & Paper Res Ctr, Dept Chem Engn, Hamilton, ON L8S 4L7, Canada
关键词
electrophoresis; functional microgels; morphology;
D O I
10.1016/j.polymer.2004.11.055
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The electrophoretic mobility of then-nosensitive poly(N-isopropylacrylamide) (PNIPAM) microgels, functionalized to contain the same bulk carboxylic acid content using acrylic acid (AA), methacrylic acid (MAA), vinylacetic acid (VAA) and acrylamide hydrolyzed in situ (H-AM), is fit to the soft particle mobility model developed by Ohshima. Good model fits were achieved for experimental mobility data as a function of both ionic strength and temperature. The model deconvolutes the underlying contributions to soft particle mobility, identifying large morphology differences between microgels with similar absolute mobility values (i.e. AA-NIPAM and VAA-NIPAM). The differences in the predicted morphologies can be correlated to the physical properties of the carboxylic acid-containing comonomers and independent light scattering data. Theoretical softness models significantly overestimate the best-fit softness of the microgels but give reasonable estimates of how the softness changes as a function of temperature. Based on simultaneous comparisons of the best-fit softness, volumetric charge density, mobility, and particle size profiles, functionalized microgels appear to deswell primarily through a consecutive core-shell mechanism. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1139 / 1150
页数:12
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