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Title page for ETD etd-03222019-154426


Type of Document Dissertation
Author Crescentini, Tiffany Marie
Author's Email Address tiffany.m.crescentini@gmail.com
URN etd-03222019-154426
Title MASS SPECTROMETRY: AN APPROACH TO CHARACTERIZING POLYURETHANE POLYMERS
Degree PhD
Department Chemistry
Advisory Committee
Advisor Name Title
John A. McLean Committee Chair
David M. Hercules Committee Member
M. Shane Hutson Committee Member
Ned A. Porter Committee Member
Keywords
  • ion mobility
  • polyurethane
  • mass spectrometry
Date of Defense 2019-03-11
Availability unrestricted
Abstract
Polyurethane (PU) di-block copolymers are one of the most versatile polymeric materials, commonly manufactured in the form of flexible and rigid foams, thermoplastics, thermosets, coatings, adhesives, sealants, and elastomers. In a PU network, the polymer backbone is comprised of hard and soft segments. PU hard segments include aromatic or aliphatic diisocyanates (-NCO) and soft segments consist of aliphatic polyols (-OH). PUs are extremely complex materials, which can be challenging to characterize due to intrinsic polydispersity, cross-linking, and structural heterogeneity among the most purified samples. The development of advanced analytical techniques is needed for customizable material design. In this work, a series of mass spectrometry (MS) based techniques such as electrospray and matrix assisted laser/desorption ionization were used study PUs and their unique precursors. Additionally, tandem mass spectrometry (MS/MS) was used to study fragmentation pathways associated with different PU systems. Ion mobility-mass spectrometry (IM-MS) also provided a multidimensional approach to studying unique gas-phase architectural motifs, cation coordination, and fragmentation pathways. The combination of MS, MS/MS, and IM-MS/MS prove to be useful for detailed PU characterization.
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