Segregation of Benzoic Acid in Polymer Crystalline Cavities

Autor: Antonietta Cozzolino, Guglielmo Monaco, Paola Rizzo, Gaetano Guerra
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Polymers, Vol 15, Iss 1, p 177 (2022)
Druh dokumentu: article
ISSN: 2073-4360
DOI: 10.3390/polym15010177
Popis: Benzoic acid (BA) and its derivatives are very attractive because of their pharmacological properties, such as antioxidant, radical-regulating, antiviral, antitumor, anti-inflammatory, antimicrobial and antifungal. Syndiotactic polystyrene (sPS) and poly(2,6-dimethyl-1,4-phenylene)oxide (PPO) films exhibiting co-crystalline phases with BA were prepared and characterized by WAXD, FTIR and polarized FTIR measurements. The FTIR measurements clearly showed that BA was present mainly as a dimer in the crystalline channels of the ε form of sPS as well as in the α form of PPO, as generally occurs not only in the solid state but also in organic dilute solutions. BA was instead present as isolated molecules in the crystalline cavities of the δ form of sPS. In fact, the FTIR spectra of BA guest molecules exhibited vibrational peaks close to those of BA in its vapor phase. Hence, the nanoporous-crystalline δ form of sPS not only avoids additive aggregation but also leads to the separation of dimeric molecules and the segregation of monomeric BA.
Databáze: Directory of Open Access Journals
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