Sprecher
Beschreibung
Co-crystalline (CC) polymer phases with small guest molecules can be obtained for many regular and stereoregular polymers. This lecture will be devoted to the very limited number of polymer CC phases that, by suitable guest removal procedures, can generate nanoporous-crystalline (NC) phases [1-4]. NC polymer phases, exhibiting density lower than for the corresponding amorphous phases, till now were discovered only for two commercial polymers: syndiotactic polystyrene (δ [1] and ε [2] phases) and poly(2,6-dimethyl-1,4-phenylene)oxide (shortly known as polyphenyleneoxide or PPO, α and β phases [3,4]). Polymer conformations and crystal packing of these NC and corresponding CC phases will be shown.
Three kinds of special morphologies of NC and CC polymers (aerogels, films with planar orientations and films with high-surface area) [5], which are possibly relevant for many applications, will be also discussed.
Several exciting new materials based on NC and CC polymer phases can be achieved. Polymeric NC phases give outstanding performances in the fields of molecular separations, water/air purification and sensorics. Moreover, NC polymer phases can be easily transformed into CC polymer phases with active guest molecules, which are promising for several kinds of advanced applications.
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[2] V. Petraccone, O. Ruiz de Ballesteros, O.Tarallo, P. Rizzo, G. Guerra, Chem. Mater., 20, 3663 (2008).
[3] C. Daniel, S. Longo, G. Fasano, J.G. Vitillo, G. Guerra, Chem. Mater., 23, 3195 (2011).
[4] B. Nagendra, A. Cozzolino, C. Daniel, P. Rizzo, G. Guerra, F. Auriemma, C. De Rosa, M.C. DAlterio, O. Tarallo, A. Nuzzo, Macromolecules, 52, 9646 (2019).
[5] B. Nagendra, A. Cozzolino, C. Daniel, P. Rizzo, G. Guerra, Macromolecules, 55, 2983 (2022).