Diffusion and Equilibrium Swelling of Macromolecular Networks by Their Linear Homologs.
Abstract
Polydimethylsiloxane (PDMS) networks having strands of molecular weight in the range 11,000-36,000 have been prepared by endlinking linear PDMS molecules of these molecular weights with a tetrafunctional linking agent. Absorption of a series of homologous linear PDMS molecules by the resulting PDMS networks has been investigated. The diffusion coefficients at 70 deg were found to be rather large, 1x10 to the minus 12th power - 6x10 to the minus 12th power m(2)/s, and approximately inversely proportional to the molecular weight of the diffusion liquid, over the range 5,000-38,000. the amounts of liquid absorbed at equilibrium was relatively small, 10% - 80% in good agreement in all cases with an especially simple version of the Flory-Huggins theory when the heat of mixing is made vanishingly small and only entropic terms are retained.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1982
- Accession Number
- ADA120695
Entities
People
- Alan Neville Gent
- R. H. Tobias
Organizations
- University of Akron