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• W2197638968 abstract "This dissertation focuses on the application of newmass spectrometry approaches for the characterization of differenttypes of synthetic materials. Combination of the classical andinnovative methods, such as electron transfer dissociation (ETD)and ion mobility mass spectrometry (IM-MS) enabled the conclusiveand unambiguous determination of macromolecular structures, endgroups and architectures, as well as stoichiometry of highmolecular weight complexes whose detection is often obscured bycharge overlapping, viz. [M+Na]+ and[2M+2Na]2+. Chapter III concerns theinvestigation of phosphazenes, a broad class of important inorganiccompounds. For this goal, different mass spectrometry techniqueswere employed to better understand the reaction products but alsotheir particular chemistry under mass spectrometry conditions. Thetadpole architecture was detected for the first time among theproducts of the reaction between NH4Cl andPCl5 by utilizing IM-MS and tandem massspectrometry (MS2). The reaction[PCl3N]3 withMXn to form[PCl3N]3.HMXn+1superacids was confirmed by detecting both the protonated weak base[PCl3N]3 and thecorresponding labile anion species[MXn+1]-.Chapter IVevaluates of ETD, a new MS2 technique, forthe structural analysis of polymers, specifically polyester homo-and copolymers, and also a comparison between this new method andthe classical collisionally activated dissociation (CAD).Advantages of ETD over CAD, include less congestedMS2 spectra due to site specificdissociations, fragment ions in a lower charge state than theprecursor ion and absence the of consecutive dissociations of thefirst generation of fragment ions, which lead to more specific endgroup information and more readily interpretable spectra.The lastchapter covers an investigation, by electrospray ionization massspectrometry (ESI-MS), of the noncovalent interactions betweendifferently substitued POSS molecules and sorbitol-type nucleatingagents for developing nanocomposite materials with isotacticpolypropylene (iPP). The complexes detected and theirstoichiometries were confirmed not only by mass measurements butalso by their dissociation (MS2) and byexamination of their charge states and size by IM-MS. These studiesconfirmed the formation of high order heterocomplexes between POSSparticles carrying both silanol and phenyl groups and sorbitolmolecules substituted by phenyl groups, underscoring that bothhydrogen bonding and π-π interactions are necessary to formPOSS-sorbitol self-assemblies. Such self-assembled structures canbe evenly blended with iPP to yield hybrid materials with superiorphysical and mechanical properties." @default.
• W2197638968 created "2016-06-24" @default.
• W2197638968 creator A5040659353 @default.
• W2197638968 date "2012-01-01" @default.
• W2197638968 modified "2023-09-24" @default.
• W2197638968 title "Novel applications of mass spectrometry on synthetic polymeric materials" @default.
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