Skip to main content

Research Repository

Advanced Search

Synthesis, structure, and properties of hyperbranched polyesters based on dimethyl 5-(2-hydroxyethoxy)isophthalate

Parker, D.; Feast, W.J.

Authors

D. Parker

W.J. Feast



Abstract

The melt condensation polymerization of the AB(2) monomer dimethyl 5-(2-hydroxyethoxy)isophthalate exhibits unusual molecular weight growth characteristics. The number-average molecular weight (M-n) reaches a plateau value after a relatively short polymerization time,whereas the weight-average molecular weight (M-w) continues to increase. The maximum in M- n is thought to be a consequence of intramolecular cyclization reactions, evidence of which is provided by MALDI-TOF MS. It is postulated that the continual increase in weight-average molecular weight, even after complete cyclization, is due to a redistribution of polymer chains by ester interchange reactions. The polymers are soluble in common organic solvents, and solutions have characteristically low intrinsic viscosities. The degree of branching, as determined by quantitative C-13 NMR spectroscopy, is consistent with the theoretical value for a statistical distribution at high conversion. The physical characterization of these polymers is reported.

Citation

Parker, D., & Feast, W. (2001). Synthesis, structure, and properties of hyperbranched polyesters based on dimethyl 5-(2-hydroxyethoxy)isophthalate. Macromolecules, 34(7), 2048-2059. https://doi.org/10.1021/ma0018805

Journal Article Type Article
Publication Date 2001-03
Deposit Date Apr 20, 2007
Journal Macromolecules
Print ISSN 0024-9297
Electronic ISSN 1520-5835
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 34
Issue 7
Pages 2048-2059
DOI https://doi.org/10.1021/ma0018805