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  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Solid-state nuclear magnetic resonance studies of phosphazene inorganic polymers
  name:
    name part: Crosby, Richard Carl.
    role:
      role term: creator
  name:
    name part: Haw, James F.
    role:
      role term: degree supervisor.
  name:
    name part: Martin, Charles R.
    role:
      role term: degree committee member.
  name:
    name part: Nevels, Robert D.
    role:
      role term: degree committee member.
  name:
    name part: Russell, David H.
    role:
      role term: degree committee member.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  genre: Academic theses
  origin info:
    place:
      place term: xx
    date issued: 1989
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xvii, 194 leaves : illustrations ; 29 cm
  abstract: Polyphosphazenes are inorganic polymers which are based on chains of alternating phosphorus and nitrogen atoms. These materials are of considerable interest because of their mechanical and thermal properties, solvent resistance, and potential for providing biocompatible materials. This dissertation describes solid-state NMR studies of several important problems in polyphosphazene chemistry including hydrolysis, cross-linking, morphology, and molecular dynamics. Also, instrumentation and methodology are described which make variable-temperature (VT) magic-angle spinning (MAS) NMR reliable and routine at temperature between 77 K and 540 K. The role of the hydrolysis products of hexachlorocyclo-triphosphazene as catalysts for the melt polymerization was investigated using [^1]H MAS NMR. In an effort to assign the resonances in the [^1]H MAS spectra a novel NMR experiment was developed in which the magnetization from low-[gamma] nuclei is transferred (via cross polarization) to protons. [^31]P MAS NMR was used to examine hydrolysis and cross-linking in 2 and also the role of hydrolysis in the thermal degradation of poly [bis(ethoxy)phosphazene] (PBEP). The results of those studies indicated that both hydrolysis and cross-linking sites in polyphosphazenes can be observed and quantified using [^31]P MAS NMR. Several MAS NMR techniques, in conjunction with differential scanning calorimetry (DSC), have been employed in the study of morphology in polyphosphazenes. The thermal transition behavior of poly [bis(4-isopropylphenoxy)phosphazene] (PBIP) was examined using high temperature cross polarization (CP)/MAS NMR. The NMR spectra acquired verified the existence of two distinct crystalline phases in that polymer and indicated that conversion from one crystalline phase to the other occurs through a disordered, metastable state. The morphology of poly [bis(3-methylphenoxy)-phosphazene] (PB3MP) was studied using [^31]P CP/MAS NMR and [^31]P 2-D solid-state NMR. Those studies ind…
  note: "Major subject: Chemistry."
  note: Typescript (photocopy).
  note: Vita.
  note: Ph. D. Texas A & M University 1989
  note: Includes bibliographical references.
  subject:
    topic: Nuclear magnetic resonance
  subject:
    topic: Polymers
  subject:
    topic: Solid state chemistry
  subject:
    topic: Major chemistry
  identifier: http://proxy.library.tamu.edu/login
  identifier: https://hdl.handle.net/1969.1/DISSERTATIONS-1017982
  identifier: http://gateway.proquest.com/openurl
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: https://hdl.handle.net/1969.1/DISSERTATIONS-1017982
  related item:
    location:
      url: http://gateway.proquest.com/openurl
  record info:
    record content source: TXA
    record creation date: 900629
    record change date: 20220103134952.0
    record identifier: in00000901992
    language of cataloging:
      language term: eng