Influence of Cure Systems on Dielectric and Viscoelastic Relaxations in Crosslinked Chlorobutyl Rubber

Abstract

The temperature and frequency-dependent Young's modulus and loss tangent have been examined as functions of cure systems and plasticizer loading in chemically crosslinked butyl and chlorobutyl rubbers. The crosslinked materials exhibited thermorheologically simple behavior. Dielectric permittivity and loss were measured as functions of frequency and temperature. The viscoelastic and dielectric behaviors were significantly influenced by the type of crosslinking system and by plasticizer loading. The Kolrausch-Williams-Watts 'stretched exponential' function was found to be a reasonable fit to both the dielectric and dynamic mechanical spectra. The effects of molecular motions and cooperative behavior upon the two types of relaxations have been discussed.... Dielectric spectroscopy, Young's modulus, Kolrausch-Williams-Watts function, Cure systems, Chlorobutyl rubber, Cooperative relaxations.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1992
Accession Number
ADA260058

Entities

People

  • Christopher S. Coughlin
  • Linda L. Beumel
  • Rodger N. Capps

Organizations

  • United States Naval Research Laboratory

Tags

DTIC Thesaurus Topics

  • Alkenes
  • Biomedical And Dental Materials
  • Butyl Rubber
  • Copolymers
  • Dielectric Permittivity
  • Frequency
  • Materials
  • Military Research
  • Modulus Of Elasticity
  • Molecules
  • Plasticizers
  • Polymers
  • Relaxation Time
  • Rubber
  • Spectra
  • Spectroscopy
  • Synthetic Rubber

Fields of Study

  • Materials science

Readers

  • Microwave Engineering.
  • Polymer Science and Engineering.
  • Structural Dynamics.