rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Study of the morphology and its effects on the mechanical properties of linear low density polyethylene
  name:
    name part: Aften, Carl Wilhelm
    name part: 1961-
    role:
      role term: creator
  name:
    name part: Hoeve, C. A. J.
    role:
      role term: degree supervisor.
  name:
    name part: Adams, E. T.
    role:
      role term: degree committee member.
  name:
    name part: Ham, Joe S.
    role:
      role term: degree committee member.
  name:
    name part: Meyers, Edward A.
    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: 1992
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xxv, 196 leaves : illustrations ; 29 cm
  abstract: A linear low density polyethylene, with 1-octene as the co-unit, forms a semicrystalline matrix when cooled from the melt. This matrix is composed of a spherulitic superstructure with a lamellar microstructure. The careful study of characterized fractions allowed the quantitative description of the melting profile of the whole copolymer, which corresponds to the crystallite size distribution. This description was achieved by the calculation of the most probable unbranched ethylene sequence, and whereby it was assumed that the lamellar thickness is directly linked to this sequence. This lamellar thickness had to be adjusted by the number average molecular weight to achieve the final distribution. Another method extrapolated the effect of branching on this sequence from a region of low branching frequency to a region of high frequency. This lamellar thickness also had to be adjusted by the number average molecular weight to achieve the final distribution. The crystallite size distribution of the fractions and the whole copolymer was changed by annealing procedures. The rate of change was accelerated by the use of cool-raise and cool-raise-cool procedures. The rate and extent of change is governed by the branch and molecular weight distribution. The total crystallinity was rather invariant for this copolymer. This was explained by segregation of low-molecular weight fractions. At very low strain, the stress relaxation was found to be dependent on the total crystallinity, but independent of the crystallite size distribution. Frequency-temperature studies indicated that the modulus may be predicted, at least up to the melting point, by the extrapolation of low temperature data and by taking into account changes in the degree of crystallinity. However, the imaginary modulus is affected more than the real modulus by the distribution change.
  note: Typescript (photocopy).
  note: Vita.
  note: "Major subject: Chemistry."
  note: Ph. D. Texas A & M University 1992
  note: Includes bibliographical references.
  subject:
    topic: Polyethylene
    topic: Mechanical properties
  subject:
    topic: Polymers
    topic: Analysis
  subject:
    topic: Major chemistry
  identifier: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  record info:
    record content source: TXA
    record creation date: 930312
    record change date: 20200904152610.0
    record identifier: in00001116717
    language of cataloging:
      language term: eng