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Liquid crystalline semifluorinated ionic dendrimers

AuthorsMartín-Rapún, Rafael; Marcos, Mercedes; Omenat, Ana; Serrano, José Luis; Taffin de Givenchy, Elisabeth; Guittard, Frederic
Inorganic Chemistry
Materials Chemistry
Materials Science
Physical Chemistry
Polymer Science
Issue DateMar-2007
PublisherTaylor & Francis
CitationLiquid Crystals 34(3): 395-400 (2007)
AbstractPoly(propyleneimine) [PPI-(NH2) n ] and poly(amidoamine) [PAMAM-(NH2) n ] dendrimers with n = 4, 8, 16, 32 and 64, have been functionalized with a semifluorinated carboxylic acid [CF3(CF2)7CH2CH2COOH] on the surface. The thermal and liquid crystal properties of the resulting ionic dendrimers have been studied by polarized optical microscopy (POM), differential scanning calorimetry (DSC) and X-ray diffraction (XRD). All dendrimers show a smectic A (SmA) mesophase, except that derived from the fifth generation of PPI, which displays a columnar mesophase. The mesomorphic behaviour of the dendrimers is attributed to the formation of ionic bonds and to the microsegregation of the dendritic branches and the fluorinated peripheral chains.
Description6 pages.
Publisher version (URL)http://dx.doi.org/10.1080/02678290601171279
Appears in Collections:(ICMA) Artículos
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