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Student Number 80321031
Author Hung-ching Wen(ŧ)
Author's Email Address No Public.
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Department Chemical and Materials Engineering
Year 1992
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Effect of Plasma Treatments on the Interfacial and Fracture Properties of Kevlar Fiber Composites
Date of Defense
Page Count 121
Keyword
  • Kevlar fiber;Epoxy resin;IFSS;Plasma treatment;Microbond
  • Abstract The surface of p-aramid poly( p-phenylene terephthalamide )(
    PPTA,Kevlar 149)fibers was modified using gas(oxygen and ammo-
    nia)plasma etching, monomer(acrylic acid,AAc and acrylonitrile
    ,AN)plasma deposition, and gas plasma etching / monomer plasma
    deposition to improve their adhesion to epoxy resins. The eff-
    ects on the fibers were characterized by changing the tensile
    strength and interfacial shear strength (IFSS) of the fibers.
    IFSS was measured using the microbond test method,which showed
    that the IFSS increased by a factor of 1.1to 2.07 after plasma
    treatments. The surface chemistry and morphology were charact-
    erized by IR,ESCA, and scanningelectron microscopy (SEM) . The
    plasma treatments increased the concentration of polar groups
    and surface energy on the fiber surface,resulting in a fall in
    the observed epoxy resin contact angle estimated by the drop-
    let measurement technique, and also corresponding improvements
    of interfacial shear strength between resins and the fibers .
    Infrared analysis shows that plasma-polymerized deposition of
    AAc and AN films have large fractions of homonuclear bonds and
    that this materialis best described as a Polymer.In this study
    ,the atomic composition changes of the surface of Kevlar fibers
    were identified by means of ESCA,referring to the atomic ratio
    of virgen Kevlar. SEM was also used to study the topography of
    fibers pulled from the epoxy resin.It was observed that micro-
    bond pull-out failure occurred both at the interface and in
    bulk epoxy resin. In some cases,fibrils were peeled from fibers
    . From this study,it has been found that the interfacial shear
    strength of the gas plasma etching and AAc plasma-polymerized
    film increased with the increasing of plasma treatment time and
    power input. However, the AN plasma-polymerized film is diffe-
    rent.
    Table of Content
    Reference
    Advisor
  • Shin-shing Shyu(}s)
  • Files No Any Full Text File.
    Date of Submission

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