NOVEL POLYVINYL ETHER HY ZEOLITE HYBRID MATERIALS - GENERAL FEATURES

The application of a specific surface-mediated cationic polymerization technique under well-defined reaction conditions yields a series of p olyvinyl ether (PVE)-HY-zeolite hybrid materials containing polyenyliu m sequences. The key to the success of this synthetic approach is the use of a Na/HY-zeolite with a controlled Na/H ratio and a vinyl ether component (CH2=CHOR) with selected size of the substituent R (ethyl, i sobutyl, and cyclohexyl) or 2,3-dihydrofuran. The novel PVE-HY-zeolite hybrid materials display outstanding optical properties. The length o f the polyenylium sequences is correlated with the size of the substit uent on the vinyl ether component. The properties of the solid samples and the mechanisms of the structure transformation of the PVE chain i nside the zeolite supercage were investigated by means of C-13{H-1}CP- MAS NMR, UV-vis, and DRIFT spectroscopy, GC, and DTG measurements.