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Tailoring the Degree of Branching in Hyperbranched Poly (arylene ether sulfone)s and Poly(arylene ether ketone)s prepared via an A2 + BB′B″ Approach

Raghavapuram, Shravanthi
http://rave.ohiolink.edu/etdc/view?acc_num=wright1261430736

Abstract Details

2009, Master of Science (MS), Wright State University, Chemistry.
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.
Eric Fossum, PhD (Advisor)
Kenneth Turnbull, PhD (Committee Member)
David Dolson, PhD (Committee Member)
Joseph F. Thomas, Jr., Phd (Other)
99 p.
Chemistry
Hyperbranched Polymers; Poly(arylene ether)sulfone; Poly(arylene ether)ketone; Degree of branching; model reactions; thermal analysis; temperature effect; concentration effects

Recommended Citations

Citations

  • Raghavapuram, S. (2009). Tailoring the Degree of Branching in Hyperbranched Poly (arylene ether sulfone)s and Poly(arylene ether ketone)s prepared via an A2 + BB′B″ Approach [Master's thesis, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright1261430736

    APA Style (7th edition)

  • Raghavapuram, Shravanthi. Tailoring the Degree of Branching in Hyperbranched Poly (arylene ether sulfone)s and Poly(arylene ether ketone)s prepared via an A2 + BB′B″ Approach. 2009. Wright State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=wright1261430736.

    MLA Style (8th edition)

  • Raghavapuram, Shravanthi. "Tailoring the Degree of Branching in Hyperbranched Poly (arylene ether sulfone)s and Poly(arylene ether ketone)s prepared via an A2 + BB′B″ Approach." Master's thesis, Wright State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=wright1261430736

    Chicago Manual of Style (17th edition)

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© 2009, all rights reserved.
This open access ETD is published by Wright State University and OhioLINK.