THE OBJECTIVE OF THE PROPOSED WORK IS TO DEVELOP ADVANCED SYNTHETIC METHODOLOGIES THAT AFFORD NANOPOROUS MATERIALS WITH SELECTIVE UPTAKE AFFINITY TOWARDS CARBON DIOXIDE AND LARGE GAS STORAGE CAPACITIES. THE EXPECTED SIGNIFICANCE OF THIS WORK IS THE INCREASE IN POROSITY AND UPTAKE CAPACITY IN AZOLINKED POROUS ORGANIC POLYMERS ALP FOR CARBON DIOXIDE CAPTURE AS WELL AS INCREASED THERMAL STABILITY OF THESE MATERIALS BY THE INCORPORATION OF A CYCLIC BACKBONE. CYCLIC POLYMERS SHOW REMARKABLY DIFFERENT BEHAVIORS THAN THEIR LINEAR COUNTERPARTS AND ARE EXPECTED TO PROVIDE A HIGHLY TUNABLE SYSTEM FOR REMOVING IMPURITIES SUCH AS CARBON DIOXIDE FROM BREATHING AIR ABOARD SPACE VESSELS. THE TUNABILITY WILL BE FURTHER ENHANCED BY THE CONSTRUCTION OF ALP-BASED MOLECULAR BRUSH POLYMERS WHICH BEHAVE SIGNIFICANTLY DIFFERENTLY FROM LINEAR POLYMER ANALOGS AND WILL ALLOW FOR PRE-ESTABLISHED MOLECULAR DESIGN PARAMETERIZATION FACILITATED BY THE COVALENT CONNECTIVITY COMBINED WITH SOLUTION- AND SOLID-STATE ASSEMBLY PROCESSES. CYCLIC BRUSH POLYMERS WILL BE ACHIEVED BY RING-EXPANSION METATHESIS POLYMERIZATION REMP AND A SIGNIFICANT EFFORT WILL BE DIRECTED TOWARDS MODIFICATIONS OF THE CATALYST AND REACTION CONDITIONS TO IMPROVE CONTROL OF THIS POLYMERIZATION. HIGHLY DENSE NETWORKS OF AZO-LINKAGES RECENTLY SHOWN TO BE EFFICACIOUS FOR SELECTIVE CARBON DIOXIDE UPTAKE WILL BE ACHIEVED BY GRAFTING FROM TECHNIQUES. A LIBRARY OF CYCLIC BRUSHES WITH VARYING BACKBONE LENGTH AZO-LINKAGE COMPOSITIONAL FRACTION AND AZO-LINKAGE BRANCH POINTS WILL BE PREPARED AND TESTED TO EXPERIMENTALLY OBTAIN CARBON DIOXIDE UPTAKE CAPACITY AND SELECTIVITY.