Philic and phobic segregation in liquid-crystal ionic dendrimers: an enthalpy-entropy competition.
Instituto de Ciencia de Materiales de Aragón-CSIC, Universidad de Zaragoza, Plaza San Francisco s/n, 50009-Zaragoza, Spain.Angewandte Chemie International Edition (Impact Factor: 11.34). 02/2010; 49(11):1990-4. DOI: 10.1002/anie.200905654
- Chemistry of Materials 07/2010; 22(16):4762. · 8.54 Impact Factor
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ABSTRACT: The synthesis and characterization of ionic liquid crystalline dendritic polymers based on the ammonium salts of commercially available poly(propylene imine) (PPI), poly(amidoamine) (PAMAM), poly(ethyleneimine) (PEI), and the fully methylated PEI (PEIMe) with 5-(4-cyanobiphenoxy)pentanoic acid (CBPA) are reported. The occurrence of proton transfer from the carboxylic acid to the amine groups is confirmed using IR and NMR techniques. The mesomorphic behavior is investigated by means of differential scanning calorimetry, polarizing optical microscopy, and X-ray diffractometry. Although CBPA exhibits monotropic nematic mesomorphism, all ionic complexes display enantiotropic liquid crystal properties. The relationship between the mesomorphism of the complexes and their structure is discussed.Macromolecular Chemistry and Physics 01/2012; 213(3):270. · 2.45 Impact Factor
Chapter: Liquid Crystalline DendrimersDendrimers: Towards Catalytic, Material and Biomedical Uses, 08/2011: pages 125 - 140; , ISBN: 9781119976530
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