Molecular Mobility in Oriented and Unoriented Membranes Based on Poly[2-(Aziridin-1-yl)ethanol]

• Published in: Polymers Vol. 13; no. 7; p. 1060
• Main Authors: Teruel-Juanes, Roberto, Bogdanowicz, Krzysztof Artur, Badia, Jose D, Sáenz de Juano-Arbona, Victor, Graf, Robert, Reina, Jose A, Giamberini, Marta, Ribes-Greus, Amparo
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 28.03.2021; MDPI
• Subjects: Benzoates; Chain dynamics; Copolymers; Dendritic structure; dendronic liquid crystal membranes; dielectric relaxation spectra; Ethanol; Fragility; Glass transition; Liquid crystals; macromolecular cooperativity; Membranes; Molecular motion; Nitrogen; NMR spectroscopy; Orientation; poly[2-(aziridin-1-yl)ethanol] (PAZE); Polymers; segmental dynamics; Solvents; Spectrum analysis; Thermal expansion; United States > US; Germany; dielectric relaxation spectra; dendronic liquid crystal membranes; macromolecular cooperativity; poly[2-(aziridin-1-yl)ethanol] (PAZE); segmental dynamics
• ISSN: 2073-4360; 2073-4360
• DOI: 10.3390/polym13071060

Unoriented and oriented membranes based on dendronized polymers and copolymers obtained by chemical modification of poly[2-(aziridin-1-yl) ethanol] (PAZE) with the dendron 3,4,5-tris[4-( -dodecan-1-yloxy)benzyloxy]benzoate were considered. DSC, XRD, CP-MAS NMR and DETA, contribute to characterize the tendency to crystallize, the molecular mobility of the benzyloxy substituent, the dendritic liquid crystalline group and the clearing transition. The orientation of the mesogenic chain somewhat hindered this molecular motion, especially in the full substituted PAZE. The fragility, free volume and thermal expansion coefficients of these membranes near the glass transition are related to the orientation and the addition of the dendritic groups. PAZE-based membranes combine both order and mobility on a supramolecular and macroscopic level, controlled by the dendritic group and the thermal orientation, and open the possibility of preparing membranes with proper channel mobility that promotes selective ionic transport.