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Novel Applications of Mass Spectrometry on Synthetic Polymeric Materials

Scionti, Vincenzo
http://rave.ohiolink.edu/etdc/view?acc_num=akron1335149657

Abstract Details

2012, Doctor of Philosophy, University of Akron, Chemistry.
This dissertation focuses on the application of new mass spectrometry approaches for the characterization of different types of synthetic materials. Combination of the classical and innovative methods, such as electron transfer dissociation (ETD) and ion mobility mass spectrometry (IM-MS) enabled the conclusive and unambiguous determination of macromolecular structures, end groups and architectures, as well as stoichiometry of high molecular weight complexes whose detection is often obscured by charge overlapping, viz. [M+Na]+ and [2M+2Na]2+. Chapter III concerns the investigation of phosphazenes, a broad class of important inorganic compounds. For this goal, different mass spectrometry techniques were employed to better understand the reaction products but also their particular chemistry under mass spectrometry conditions. The tadpole architecture was detected for the first time among the products of the reaction between NH4Cl and PCl5 by utilizing IM-MS and tandem mass spectrometry (MS2). The reaction [PCl3N]3 with MXn to form [PCl3N]3.HMXn+1 superacids was confirmed by detecting both the protonated weak base [PCl3N]3 and the corresponding labile anion species [MXn+1]-. Chapter IV evaluates of ETD, a new MS2 technique, for the structural analysis of polymers, specifically polyester homo- and copolymers, and also a comparison between this new method and the classical collisionally activated dissociation (CAD). Advantages of ETD over CAD, include less congested MS2 spectra due to site specific dissociations, fragment ions in a lower charge state than the precursor ion and absence the of consecutive dissociations of the first generation of fragment ions, which lead to more specific end group information and more readily interpretable spectra. The last chapter covers an investigation, by electrospray ionization mass spectrometry (ESI-MS), of the noncovalent interactions between differently substitued POSS molecules and sorbitol-type nucleating agents for developing nanocomposite materials with isotactic polypropylene (iPP). The complexes detected and their stoichiometries were confirmed not only by mass measurements but also by their dissociation (MS2) and by examination of their charge states and size by IM-MS. These studies confirmed the formation of high order heterocomplexes between POSS particles carrying both silanol and phenyl groups and sorbitol molecules substituted by phenyl groups, underscoring that both hydrogen bonding and π-π interactions are necessary to form POSS-sorbitol self-assemblies. Such self-assembled structures can be evenly blended with iPP to yield hybrid materials with superior physical and mechanical properties.
Chrys Wesdemiotis, Dr. (Advisor)
Peter Rinaldi, Dr. (Committee Member)
Claire Tessier, Dr. (Committee Member)
Sailaja Parachuri, Dr. (Committee Member)
Sadhan Jana, Dr. (Committee Member)
Analytical Chemistry
Mass spectrometry; ESI; MALDI; synthetic polymer; ETD; ion mobility; phosphazenes

Recommended Citations

Citations

  • Scionti, V. (2012). Novel Applications of Mass Spectrometry on Synthetic Polymeric Materials [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1335149657

    APA Style (7th edition)

  • Scionti, Vincenzo. Novel Applications of Mass Spectrometry on Synthetic Polymeric Materials. 2012. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1335149657.

    MLA Style (8th edition)

  • Scionti, Vincenzo. "Novel Applications of Mass Spectrometry on Synthetic Polymeric Materials." Doctoral dissertation, University of Akron, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1335149657

    Chicago Manual of Style (17th edition)

akron1335149657
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© 2012, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.