Publication Date
2009
Document Type
Thesis
Committee Members
David Dolson (Committee Member), Eric Fossum (Advisor), Joseph F. Thomas, Jr. (Other), Kenneth Turnbull (Committee Member)
Degree Name
Master of Science (MS)
Abstract
The synthesis and characterization of hyperbranched poly(arylene ether)s with tailored degrees of branching has been explored via an A2+B3 approach. The reactivity of the individual electrophilic sites towards nucleophilic aromatic substitution, NAS, of the BB'B" monomers 4, 3', 5'-trifluorophenyl sulfone, 1 and 4, 3', 5'-trifluoro benzophenone, 2 were studied. The concentration, temperature and solvent conditions had an effect on the degree of branching, DB, in 1 and 2 and were probed via 13C and 19F NMR spectroscopy as well as a series of model reactions employing p-cresol 16, which acts as the nucleophile. Soluble, branched, poly (arylene ether)s, with controlled degrees of branching were prepared by performing the polycondensation reactions at higher temperatures with 1 leading to relatively higher DB values than 2. The glass transition, Tg and thermal stability of the soluble polymers increased as the degree of branching increased. Tg ranged from 126 °C to 177 °C, while 5% weight loss temperatures ranged from 372 °C to 514 °C under nitrogen and from 229 °C to 510 °C in air.
Page Count
99
Department or Program
Department of Chemistry
Year Degree Awarded
2009
Copyright
Copyright 2009, all rights reserved. This open access ETD is published by Wright State University and OhioLINK.
