Hedden, R.
and Bauer, B.
(2003),
Structure and Dimensions of PAMAM/PEG Dendrimer-Star Polymers, Macromolecules, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=852070
(Accessed October 10, 2024)
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Structure and Dimensions of PAMAM/PEG Dendrimer-Star Polymers
Published
Author(s)
,
Abstract
Dendrimer-star polymers are prepared by grafting monofunctional poly(ethylene glycol) (PEG) chains of low polydispersity onto the terminal groups of poly(amidoamine) (PAMAM) dendrimers. A novel gel permeation chromatography technique is used to calculate the average number of PEG branches (arms) per star. The maximum number of PEG arms (of Mn = 5,000 g mol-1) ranges from about 30 arms for a Generation 3 dendrimer-star to about 750 arms for a Generation 10 dendrimer-star. Radii of gyration of the stars are measured in dilute solution in a good solvent (methanol-d4) by small-angle neutron scattering (SANS). The stars have measured radii of gyration of (5 to 14) nm. Dendrimer-stars are modeled as a shell of linear chains tethered to a spherical core. The core radius is taken to be the measured hydrodynamic radius of the dendrimer. The density distribution within the shell and the shell thickness are adopted from a model of Vagberg, Cogan, and Gast.The radii of gyration computed from the core-shell model are consistent with the measured values from SANS.Citation
Macromolecules
Volume
36
Issue
No. 6
Pub Type
Journals
Download Paper
Keywords
dendrimer, neutron scattering radius of gyration, polymer brush, star polymer
Citation
Issues
If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.
Created March 1, 2003, Updated February 17, 2017