Journal article
A Model To Determine Local, Microscopic Flux Profiles within Composites from the Measured, Macroscopic Flux: Application to Poly(4-vinylpyridine) Composites
Journal of physical chemistry (1952), Vol.100(35), pp.14762-14768
08/29/1996
DOI: 10.1021/jp960726a
Abstract
For any heterogeneous matrix with a parametrizable geometry, a model is provided to determine a microscopic, local flux profile within the matrix from the macroscopic, experimentally measured flux of a probe species. By analyzing the dependence of the measured flux on the geometric parameters that describe the matrix, a mathematical function describing a local flux profile within the matrix is obtained. Example applications of the model include composites of Nafion and neutron track-etched polycarbonate membranes. Composites of neutron track-etched polycarbonate membranes and 20% cross-linked poly(4-vinylpyridine) are also described. The measured flux of hydroquinone through the composites varies with ro-1, where ro is the pore radius, a characteristic dimension of the matrix. The measured flux is characterized by a second-order polynomial in ro-1. The local flux profile is found by application of the model and is shown to be higher toward the center of the pore. Poly(4-vinylpyridine) is cross-linked with various dibromoalkanes, with 2-8 and 12 carbons. A quadratic relationship is found between the measured flux and the chain length of the cross-linking agent, with a minimum for 1,6-dibromohexane. Effects of interand intrachain cross-linking are discussed. © 1996 American Chemical Society.
Details
- Title: Subtitle
- A Model To Determine Local, Microscopic Flux Profiles within Composites from the Measured, Macroscopic Flux: Application to Poly(4-vinylpyridine) Composites
- Creators
- Flávio Tinoco - Chemistry Department, University of Iowa, Iowa City, Iowa 52242Johna Leddy - Chemistry Department, University of Iowa, Iowa City, Iowa 52242
- Resource Type
- Journal article
- Publication Details
- Journal of physical chemistry (1952), Vol.100(35), pp.14762-14768
- Publisher
- American Chemical Society
- DOI
- 10.1021/jp960726a
- ISSN
- 0022-3654
- eISSN
- 1541-5740
- Language
- English
- Date published
- 08/29/1996
- Academic Unit
- Chemistry
- Record Identifier
- 9984217455802771
Metrics
9 Record Views