Molecular structure characterization of hyperbranched polyesteramides

Citation
Etf. Gelade et al., Molecular structure characterization of hyperbranched polyesteramides, MACROMOLEC, 34(11), 2001, pp. 3552-3558
Citations number
46
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
MACROMOLECULES
ISSN journal
00249297 → ACNP
Volume
34
Issue
11
Year of publication
2001
Pages
3552 - 3558
Database
ISI
SICI code
0024-9297(20010522)34:11<3552:MSCOHP>2.0.ZU;2-Z
Abstract
The molecular structure of a series of hyperbranched polyesteramides was st udied using size exclusion chromatography (SEC), mass spectrometry (MS) and small-angle neutron scattering (SANS). Products with increasing molecular mass were obtained through the polycondensation of in situ produced AB(2)-l ike monomeric units. Electrospray ionization MS indicates that narrow SEC f ractions consist of different isomers, the number of which increases with m olecular mass. Molecular mass moments and polydispersity numbers increase w ith polycondensation degree. The SANS measurements and SEC-DV data yield va lues for the polymers fractal dimension, which can be rationalized in the f ramework of percolation theory that originally was designed for randomly br anched polymers. Randomly branched polymer behavior in this particular case possibly results from a side reaction involving reactivity among B-end gro ups.