Piezoresistive Polyvinylidene Fluoride/Carbon Filled Nanocomposites Metadata

Metadata describes a digital item, providing (if known) such information as creator, publisher, contents, size, relationship to other resources, and more. Metadata may also contain "preservation" components that help us to maintain the integrity of digital files over time.

Title

  • Main Title Piezoresistive Polyvinylidene Fluoride/Carbon Filled Nanocomposites

Creator

  • Author: Vidhate, Shailesh
    Creator Type: Personal

Contributor

  • Chair: D'Souza, Nandika
    Contributor Type: Personal
    Contributor Info: Major Professor
  • Committee Member: Vaidyanathan, Vijay
    Contributor Type: Personal
  • Committee Member: Brostow, Witold
    Contributor Type: Personal
  • Committee Member: Shepherd, Nigel
    Contributor Type: Personal
  • Committee Member: Chung, Jaycee
    Contributor Type: Personal

Publisher

  • Name: University of North Texas
    Place of Publication: Denton, Texas

Date

  • Creation: 2011-05

Language

  • English

Description

  • Content Description: This thesis examines the value of using dispersed conductive fillers as a stress/strain sensing material. The effect of the intrinsic conductivity of the filler on the ability to be effective and the influence of filler concentration on the conductivity are also examined. To meet these objectives, nanocomposites of polyvinylidene fluoride (PVDF) with carbon nanofibers (CNFs) and carbon nanotubes (CNTs) were prepared by melt-blending using a twin screw extruder. Since PVDF has a potential to be piezoresistive based on the type of crystalline phase, the effect of CNFs on PVDF crystallinity, crystalline phase, quasi static and dynamic mechanical property was studied concurrently with piezoresponse. Three time dependencies were examined for PVDF/CNTs nanocomposites: quasi-static, transient and cyclic fatigue. The transient response of the strain with time showed viscoelastic behavior and was modeled by the 4-element Burger model. Under quasi-static loading the resistance showed negative pressure coefficient below yield but changed to a positive pressure coefficient after yield. Under cyclic load, the stress-time and resistance-time were synchronous but the resistance peak value decreased with increasing cycles, which was attributed to charge storage in the nanocomposite. The outcomes of this thesis indicate that a new piezoresponsive system based on filled polymers is a viable technology for structural health monitoring.

Subject

  • Keyword: CNT
  • Keyword: structural health monitoring
  • Keyword: PVDF
  • Keyword: CNF

Collection

  • Name: UNT Theses and Dissertations
    Code: UNTETD

Institution

  • Name: UNT Libraries
    Code: UNT

Rights

  • Rights Access: public
  • Rights License: copyright
  • Rights Holder: Vidhate, Shailesh
  • Rights Statement: Copyright is held by the author, unless otherwise noted. All rights reserved.

Resource Type

  • Thesis or Dissertation

Format

  • Text

Identifier

  • Archival Resource Key: ark:/67531/metadc68059

Degree

  • Degree Name: Master of Science
  • Degree Level: Master's
  • Degree Discipline: Materials Science and Engineering
  • Academic Department: Department of Materials Science and Engineering
  • Degree Grantor: University of North Texas

Note