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: Mechanical behavior of multi-phase clay-modified polypropylene blend systems
  name:
    name part: Li, Yanmei.
    role:
      role term: creator
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: xx
    date issued: 2001
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xiv, 119 leaves : illustrations ; 28 cm.
  abstract: This research focuses on the toughening and strengthening mechanism in multi-phase polypropylene (PP) blends with clay at different locations. Two main categories of PP blends, based on the toughener phase used, are studied: PP/Noryl/clay blend and PP/rubber/clay blend. For PP/Noryl/clay blend, clay location can be controlled via sequential mixing technique. For PP/rubber/clay blends, clay/rubber morphology is mainly determined by rubber characteristics and the interactions between rubber phases and clay. For PP/Noryl/clay blend system, it is found that clay can maintain the rigidity of polymer comparing with the one without clay. But the clay location has little effect on the stiffness. This may be due to the low clay concentration in the blends. It is shown that clay location has great effect on toughening mechanisms in different PP blends. Toughness is decreased dramatically in the blend with clay at interface. Debonding mechanism is found to be a third toughening mechanism other than crazing and shear yielding in this blend. It is believed that debonding suppresses effective energy dissipation process, i.e., crazing. For PP/rubber/clay blend system, stiffness is increased in PP/styrene-ethylene-propylene/clay (PP/SEP/clay) in which clay resides in the matrix. Pre-mixing of SEP and clay is helpful for obtaining small clay particle size and good particle dispersion, which are crucial for strengthening PP. For PP/styrene-butadiene-styrene/clay (PP/SBS/clay) system, clay is encapsulated within SBS rubber particles. Rubber/clay particles act like rubber particles in all. Therefore, stiffness is decreased and toughness is increased. Rubber cavitation is found to be the main toughening mechanism in this system.
  note: by Yanmei Li.
  note: Vita.
  note: "Major Subject: Mechanical Engineering".
  note: Issued also on microfiche from University Microfilm Inc.
  note: Ph. D. Texas A&M University 2001.
  note: Includes bibliographical references (leaves 113-118).
  subject:
    topic: Major mechanical engineering
  identifier: 30-33830 UMI
  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: 020911
    record change date: 20190325103135.0
    record identifier: in00001702258