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From Stars to Spheres: A SAXS Analysis of Dilute Dendrimer Solutions



T J. Prosa, Barry J. Bauer, Eric J. Amis


The progression of intramolecular organizations within a series of dilute poly(amino amine) (PAMAM) dendrimer/methanol solutions is examined by use of small angle x-ray scattering (SAXS) combined with comparisons to various electron density models. The SAXS from generation 3 (G3) dendrimers are shown to possess scattering features similar to those of star molecules. This contrasts with the SAXS of the much larger G9 and G10 dendrimers. The G10 exhibits at least five resolvable secondary maxima. These features are successfully reproduced for a model consisting of constant density spheres with a small amount of polydispersity in molecular size. Scattering from the intermiediately sized G4 through G8 dendrimers reflect a consistent evolution of internal structure progressing from star-like to hard sphere-like organizations.
No. 14


dendrimers, electron density modeling, polymer, radius of gyration, small angle x-ray scattering, sphere, star


Prosa, T. , Bauer, B. and Amis, E. (2001), From Stars to Spheres: A SAXS Analysis of Dilute Dendrimer Solutions, Macromolecules, [online], (Accessed June 14, 2024)


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Created July 1, 2001, Updated February 17, 2017