A Study of Bonding Cellulose Acetate to Polyarylsulfone,
Abstract
The objective of this study was to develop a method by which ultrathin films (500 to 1500 angstroms in thickness) of cellulose acetate could be bonded to microporous supports of polyarylsulfone. In addition to the bonding requirements, the method developed could not adversely affect the salt (NaCl) rejecting and flow characteristics of the cellulose acetate-polysulfone composite. A successful method was found to be the application of a dilute solution (1.5 percent by weight) of Resyn 26-2404 to the polysulfone before casting the cellulose acetate membrane. A TYPICAL COMPOSITE WITH A SPRAYED APPLICATION OF Resyn 26-2404 had a salt rejection and water flux before dry cycle (defined as heating for 24 hours at 110 F) of 97 percent and 8.8 gal/sq ft/day respectively. After dry cycle, the average salt rejection was 95 percent and the water flux remained at approximately 8.8 gal/sq ft/day. Additional drying cycles were found to degrade the composite membranes. (Author-PL)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1973
- Accession Number
- AD0910122
Entities
People
- Paul William Cross