Abstract
Disordered crystalline modifications formed by s(2/1)2 helices of syndiotactic polystyrene (s-PS) can be prepared by the removal of bulky guest molecules from intercalate as well as from triclinic δ clathrate forms. The X-ray diffraction pattern of the disordered crystalline modification is characterized from 2θCuKα < 12° by only a broad diffraction peak whose maximum is located in the 2θCuKα range between 8.7° and 9.8°. Films presenting disordered crystalline modifications have been used for the removal of an organic pollutant from dilute aqueous solutions. The sorption behavior of the disordered crystalline modifications are compared with that of the nanoporous-crystalline δ form as well as of the dense γ form. The disordered crystalline modifications of s-PS presents pollutant (1,2-dichloroethylene) uptake comparable to those of the nanoporous δ and ε forms and much higher than those obtained for the dense γ form. Moreover, FTIR data relative to sorption of 1,2-dichloroethane show that the guest sorption occurs essentially only in the crystalline phase. As a consequence, the obtained disordered crystalline modifications of s-PS can be fully considered disordered nanoporous-crystalline modifications.
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Acknowledgments
We thank Prof. Vincenzo Venditto of University of Salerno for useful discussions. Financial support of the “Ministero dell’Istruzione, dell’Università e della Ricerca” (PRIN) and of “Regione Campania” (Legge 5) is gratefully acknowledged.
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In memory of Prof. Donald G. Miller.
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Rizzo, P., Ianniello, G., Albunia, A.R. et al. Disordered Nanoporous Crystalline Modifications of Syndiotactic Polystyrene. J Solution Chem 43, 158–171 (2014). https://doi.org/10.1007/s10953-013-0118-3
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DOI: https://doi.org/10.1007/s10953-013-0118-3