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• W2155477685 abstract "Abstract Two kinds of ionic self‐assembled complexes of linear or branched poly(ethyleneimine) ( l PEI or b PEI) with Percec‐type dendrons [(3,4,5)16G1‐COOH] were prepared as l PEI‐(3,4,5)16G1‐ x and b PEI‐(3,4,5)16G1‐ x , where x is the mole ratio of the carboxyl groups of the dendritic amphiphile to the amino groups at the PEI chain. The crystal and mesomorphous structures and thermal properties of these complexes were investigated with X‐ray diffraction (XRD), Fourier transform infrared (FTIR), differential scanning calorimetry (DSC), and polarized optical microscope (POM). Both the l PEI and b PEI complexes exhibited the same α H crystal phase and similar lamellar mesomorphous phase, irrespective of the branching of the polymer backbone and the binding degree. The l PEI series complexes l PEI‐(3,4,5)16G1‐ x , however, had more ordered lamellar stacking than that of the b PEI‐(3,4,5)16G1‐ x complexes, so the thermotropic liquid crystal phase SmA was formed only in the l PEI‐(3,4,5)16G1‐ x complexes beyond the melting point of the tail crystal of the dendritic amphiphile. No liquid crystalline phase was found from the b PEI‐(3,4,5)16G1‐ x complexes. The results suggest that the branching of polymer backbone plays a key role to the formation of thermotropic liquid crystal in the polymer–dendritic amphiphile complex. The present finding is significant for the design of functional nanostructures based on the ionic complexation of polymers and amphiphiles. © 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2011" @default.
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• W2155477685 date "2011-05-23" @default.
• W2155477685 modified "2023-10-18" @default.
• W2155477685 title "Influence of polymer backbone branching on liquid crystal mesomorphous in nonequimolar complexes of poly(ethyleneimine) and dendritic amphiphiles" @default.
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• W2155477685 doi "https://doi.org/10.1002/polb.22277" @default.
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