Use of fluorescence spectroscopy to study polymeric materials with porous structure based on imprinting by self-assembled fibrillar networks.
Different polymeric materials have been prepared from the organogels formed by a polymerizable methacrylic mixture (methyl methacrylate/ethylene glycol dimethacrylate, 1:1, w/w) and the macrocyclic pseudopeptide 1. The use of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide as a very efficient radical initiator allows polymeric materials in which the structure of the fibrils formed by self-assembly of the organogelator 1 is truly preserved to be obtained. Removal of the pseudopeptidic molecule provides materials with a porous structure reflecting that of the original self-assembled fibrils. The use of fluorescent probes such as rhodamine B and pyrene greatly facilitate the study of the porous structures formed and, accordingly, that of the morphology of the original fibrils. Those studies reveal the presence of a permanent porosity and the organization of the substructures as a porous network. This confirms the existence of a nucleation and growth mechanism for the generation of the fibrils, giving rise to the formation of spherulitic structures. Those spherulites are additionally linked by connections of variable size. A series of diffusion experiments allowed establishment of a direct dependence of the inner porosity of the materials on the amount of self-organizing template used for their preparation.
Burguete
M Isabel
MI
Departamento de Química Inorgánica y Orgánica/Unidad Asociada de Materiales Orgánicos Avanzados (UAMOA), Universitat Jaume I/CSIC, Av. Sos Baynat, s/n, 12071 Castellón, Spain.
Galindo
Francisco
F
Gavara
Raquel
R
Izquierdo
M Angeles
MA
Lima
João C
JC
Luis
Santiago V
SV
Parola
A Jorge
AJ
Pina
Fernando
F
D016880:Anisotropy; D001672:Biocompatible Materials / Q000737:chemistry*; D002627:Chemistry, Physical / Q000379:methods; D004058:Diffusion; D008027:Light; D008567:Membranes, Artificial; D015233:Models, Statistical; D010087:Oxides / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013314:Stress, Mechanical; D013499:Surface Properties; D014466:Ultraviolet Rays; D017155:Wettability
D001672:Biocompatible Materials; D008567:Membranes, Artificial; D010087:Oxides; D011108:Polymers; D010100:Oxygen