title: Synthesis and characterization of gels from polyallylamine and carbon dioxide as gellant.
abstract: The synthesis and characterization of a novel series of polymer gels are reported. They are formed at ambient temperatures by bubbling CO(2) through solutions of polyallylamine (PAA; a latent gellant) in several organic liquids, including aliphatic alcohols and 1-methyl-2-pyrrolidone. The stabilities of the alcohol gels, as indicated by the (irreversible) degelation temperature, T(g)(dt), were strongly dependent on the number of carbon atoms (C(n)) in the alkyl chains of the alcohol liquids. The mechanism of formation and the microenvironmental properties of PAA-based gels containing a small amount of a pH-sensitive probe, 2,6-naphthalenedicarboxylic acid (2,6-NDCA), have been probed using static and dynamic fluorescence measurements. A measurable pH change and significant alterations to the fluorescence spectra were coincident with gelation of PAA solutions in 1-butanol as CO(2) was bubbled through, and the fluorescence spectra were monitored over several hours until no further changes were detected. Analyses of dynamic fluorescence decay histograms indicate the presence of three decay times due to different microenvironments where the 2,6-NDCA molecules are located.
authors.affiliation: Department of Chemistry and Consortium CSGI, University of Florence via della Lastruccia, 3 I-50019 Sesto Fiorentino, Florence, Italy.
authors.forename: Emiliano
authors.initials: E
authors.lastname: Carretti
authors.forename: Luigi
authors.initials: L
authors.lastname: Dei
authors.forename: Piero
authors.initials: P
authors.lastname: Baglioni
authors.forename: Richard G
authors.initials: RG
authors.lastname: Weiss