Influence of crystalline peripheral chain length on the solid-state assemblies of amphiphilic dendrons

다국어 초록 (Multilingual Abstract)

<P>We prepared third-generation amphiphilic dendrons 3-14 and 3-18 consisting of a hydrophilic aliphatic polyether dendritic core and either tetradecyl or octadecyl peripheries, respectively. Their solid-state self-assembly behavior was investigated by comparison with 3-22 having the same dendritic core and longer docosyl peripheries. In marked contrast to the lamellar assembly of 3-22, small-angle X-ray analysis suggested that 3-14 and 3-18 show oblique columnar structures with presumably elliptical cross sections. The observed results can be rationalized by dendron shape anisotropy, which is strongly associated with the degree of crystallization as a function of alkyl chain length. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 4988–4994, 2007</P>
<B>Graphic Abstract</B>
<P>Solid-state assemblies of amphiphilic dendrons, based on a third-generation aliphatic polyether dendritic core, can be modulated from lamellar to oblique columnar structures as a function of crystalline peripheral chain length. The observed assembly behavior can be explained by variation of dendron shape attributable to the degree of crystallization of alkyl peripheries. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]</P>
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