The Synthesis and Structure of Polyphosphazenes
Final progress rept.
PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF CHEMISTRY
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The aim of this work was the design and synthesis of new polymers for membrane applications. Specific uses are anticipated in high oxygen transmission films with the exclusion of organic liquids or vapors in membranes for the capture of toxic or radioactive metal ions and in smart membranes where the permeability can be controlled by temperature or pH changes. The new high oxygen transmission membranes synthesized are based on a polyphosphazene platform with both fluoroalkoxy and adamantyl side groups. The metal capture membranes utilize a polyphosphazene backbone and sulfur-containing aliphatic side groups. The smart membranes utilize a polyphosphazene backbone and hydrophilic alkoxy-ether side groups or side units with carboxylic acid terminal units. The permeability of these membranes is controlled by lower critical solution temperature LCST behavior and by pH changes. In addition, new methods for crosslinking membranes and modifying their surfaces have been developed. The new membranes are of potential utility in protective clothing, toxic waste cleanup, and in advanced protective surface coatings.
- Polymer Chemistry