Solution properties of selectively modified hyperbranched polyesters

Simultaneous characterization of the degree of branching and molar mass on a molecular level for hyperbranched polymers is still strongly limited. Therefore model hyperbranched polyesters for development of new chromatographic techniques on the basis of 2,2-bis(hydroxymethyl)propionic acid were synt...

Full description

Saved in:
Bibliographic Details
Published in:Polymer (Guilford) 2010-08, Vol.51 (18), p.4110-4120
Main Authors: Boye, Susanne, Komber, Hartmut, Friedel, Peter, Lederer, Albena
Format: Article
Language:English
Subjects:
Applied sciences
Diols
Exact sciences and technology
Fractionation
Hyperbranched
Mathematical models
NMR spectroscopy
Organic polymers
Physicochemistry of polymers
Polarity
Polyester resins
Polyesters
Properties and characterization
Simulation
Structure, morphology and analysis
Terminals
Viscosity measurement
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Simultaneous characterization of the degree of branching and molar mass on a molecular level for hyperbranched polymers is still strongly limited. Therefore model hyperbranched polyesters for development of new chromatographic techniques on the basis of 2,2-bis(hydroxymethyl)propionic acid were synthesized. The two types of OH-functionalities (linear and terminal) of the hyperbranched polymer were selectively modified using different protection groups. The modification of the terminal end groups was carried out using their diol character with the formation of a ketal ring without changing the chemical structure of the linear OH groups. In order to obtain completely non-polar polymer, the linear OH-units were functionalized with an acetyl group. The last modification step was the deprotection of the terminal end groups by removing the ketal ring. Fractions with various molar masses for each modification stage were obtained by preparative fractionation. Extensive characterization by SEC-MALLS, NMR spectroscopy, and viscosity measurements elucidated the dependence of the molecular shape in solution on the polarity. These results were supported by molecular dynamic simulations. [Display omitted]
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2010.06.037