Reactive Polymers: Main Chain Coordination Polymers for Air Separation
Abstract
The objective of this research program was to develop and characterize new air separation membrane materials based upon polymers with tetradentate Schiff-base/Co(II) chelates incorporated in the chain backbone. Many tetradentate Schiff-base/Co(II) chelates reversibly bind oxygen and could, therefore, act as sites for facilitated transport of oxygen through polymeric membranes. However, these compounds often undergo irreversible binding with oxygen, leading to performance deterioration over time. Blending small molecule Schiff-base/Co(II) chelates with polymers or using polymers as the axial ligands required to activate the Co(II) for oxygen binding results in a significant increase in the resistance of the compounds to undergo irreversible oxidation. This project explores the notion that the positive oxygen binding stability effects of combing Schiff-base/Co(II) chelates with polymers might be markedly improved by incorporating the oxygen-binding sites into the backbone of the polymer chain. We have found that polymers containing Schiff-base/Co(II) in the chain backbone were not very soluble and had, therefore, very low degrees of polymerization. Several novel Schiff bases were synthesized, and their oxygen binding characteristics were determined in solution
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 15, 1994
- Accession Number
- ADA281614
Entities
People
- Benny D. Freeman
Organizations
- North Carolina State University