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Effect of the Phobic Segregation between Fluorinated and Perhydrogenated Chains on the Supramolecular Organization in Ionic Aromatic Dendrimers

AuthorsHernández-Ainsa, Silvia; Barberá, Joaquín; Marcos, Mercedes; Serrano, José Luis
Issue Date2010
PublisherAmerican Chemical Society
CitationChemistry of Materials 22: 4762-4768 (2010)
AbstractTwo novel series of codendrimers constituted by the grafting of poly(propylene imine) PPI-(NH2)16 (G = 3) with aromatic acids substituted with fluorinated and perhydrogenated chains in different proportions have been synthesized and their liquid crystalline properties have been investigated. Series I is generated by the ionic attachment of 4-decyloxybenzoic acid and 4-(1H,1H,2H,2H)-perfluorodecyloxybenzoic acid in different proportions. Series II results from the ionic junction of eight units of 3,4-didecyloxybenzoic acid or 3,4,5-tridecyloxybenzoic acid and eight units of 4-decyloxybenzoic acid or 4-(1H,1H,2H,2H)-perfluorodecyloxybenzoic acid. The liquid crystalline behavior has been investigated by means of differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and X-ray diffractometry (XRD). All codendrimers exhibit smectic A mesomorphism. Besides, two compounds belonging to series I present uncommon mesophases originated by the incompatibility of the fluorinated and perhydrogenated chains. On the basis of the experimental results, a supramolecular model is proposed. AFM experiments on some of the compounds were also performed to investigate their surface aggregation behavior.
Identifiersdoi: 10.1021/cm101654q
issn: 0897-4756
e-issn: 1520-5002
Appears in Collections:(ICMA) Artículos
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