title: Polymer-microporous host interactions probed by photoluminescence spectroscopy.
abstract: Zeolites NaY and ZSM-5 were used as hosts for styrene polymerization after ion-exchange with europium ions. The parent and hybrid, polystyrene coated Eu-NaY (Eu-NaY/PS) and Eu-ZSM-5 (Eu-ZSM-5/PS) zeolites were investigated by using thermal analysis, SEM, PXRD, FT-IR, DR-UV/Vis, steady state and time-resolved photoluminescence spectroscopy. FT-IR spectra evidenced for the interaction between the zeolitic hosts and polystyrene while the PXRD spectra supported for the presence of the polymer inside the channels/pores of Eu-NaY/PS and Eu-ZSM-5/PS materials. The optical properties of Eu-NaY/PS and Eu-ZSM-5/PS were significantly changed relative to those of the parent zeolites, giving further evidence for the presence of polymer inside zeolites. An interesting case is presented by NaY zeolite: following styrene polymerization, the polymer interacted selectively with one of the two main species co-existing inside zeolite while for ZSM-5 a similar effect was not observed.
authors.affiliation: National Institute for Laser, Plasma and Radiation Physics, P.O. Box MG-36, RO 76900, Bucharest-Magurele, Romania. tiseanuc@yahoo.com
authors.forename: Carmen
authors.initials: C
authors.lastname: Tiseanu
authors.forename: Vasile Ion
authors.initials: VI
authors.lastname: Parvulescu
authors.forename: Bogdan
authors.initials: B
authors.lastname: Cojocaru
authors.forename: Victor A
authors.initials: VA
authors.lastname: Lorenz-Fonfria
authors.forename: Michael
authors.initials: M
authors.lastname: Kumke
authors.forename: Andre
authors.initials: A
authors.lastname: Gessner
authors.forename: Ion
authors.initials: I
authors.lastname: Enculescu
mesh_terms: D005063:Europium / Q000737:chemistry*; D008027:Light; D049449:Luminescence; D008832:Microchemistry; D011108:Polymers / Q000737:chemistry*; D011137:Polystyrenes / Q000737:chemistry*; D016062:Porosity; D017550:Spectroscopy, Fourier Transform Infrared; D017641:Zeolites / Q000737:chemistry*
chemical_list: D011108:Polymers; D011137:Polystyrenes; D017641:Zeolites; D005063:Europium