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Block and star polymers based on 2-substituted-2-oxazolines

Demopolis, Tom Nick
http://rave.ohiolink.edu/etdc/view?acc_num=case1054929478

Abstract Details

1990, Doctor of Philosophy, Case Western Reserve University, Chemistry.
The objective of this research was to prepare star-block polymers which have potential surface activity. The basic method was ring-opening polymerization of 2-substituted oxazolines of differing polarities. In a preliminary phase, homo-, di- and tri- blocks were synthesized using a one-ended initiator. Triblocks were also prepared using several two-ended initiators, resulting in molecular weight distributions that were unacceptably broad. It was determined through a kinetic study that the reason for the broad distributions is that the initiation step is slower than the propagation step. The same problem was encountered when attempting to produce a three-armed star-block polymer starting with a trifunctional nosylate initiator. For this reason, it was decided to abandon the "core-first" approach and to proceed with an "arms-first" approach, in which one-ended living poly(N-benzoylethyleneimine) chains are reacted with an anchoring moiety containing one or two primary amine groups. First the poly(N-benzoylethyleneimine) polymers were synthesized, and their molecular weight distributions characterized by Gel Permeation Chromatography (GPC) and by Secondary Ion Mass Spectroscopy (TOF-SIMS). Using a monoarmine anchor, it was found that one or two chains could be attached at will, depending upon the ratio of arms to anchors. Using a diamine anchor with a four-to-one arm to anchor ratio, a star-block polymer mixture was obtained in which the desired four-armed star predominated. Confirming GPC data are presented, accompanied by TOF-SIMS and 1H NMR spectra.
Irvin Krieger (Advisor)
261 p.
Chemistry, Polymer
Block; star polymers; 2-substituted-2-oxazolines

Recommended Citations

Citations

  • Demopolis, T. N. (1990). Block and star polymers based on 2-substituted-2-oxazolines [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1054929478

    APA Style (7th edition)

  • Demopolis, Tom. Block and star polymers based on 2-substituted-2-oxazolines. 1990. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1054929478.

    MLA Style (8th edition)

  • Demopolis, Tom. "Block and star polymers based on 2-substituted-2-oxazolines." Doctoral dissertation, Case Western Reserve University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=case1054929478

    Chicago Manual of Style (17th edition)

case1054929478
641
© 1990, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.