Physical Aging Studies of Styrene-Butadiene and Carbonate-Siloxane Block Copolymers

Abstract

The physical aging process in styrene-butadiene and carbonate- siloxane block copolymers has been studied by monitoring the time dependent changes in mechanical and thermal properties. Specifically, stress-strain, stress relaxation and differential scanning calorimetry experiments were utilized. For the styrene-butadiene systems, it was found that the rate of physical aging increases with decreasing glassy content between 50 and 100% glass. However, the rate must decrease to zero when the percent glass reaches zero. The occurrence of physical aging was also noted in the polycarbonate siloxane block copolymer investigated. The data are discussed in light of the practical ramification of utilizing these block copolymers in material applications.

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Document Details

Document Type
Technical Report
Publication Date
Nov 19, 1979
Accession Number
ADA079608

Entities

People

  • Garth L. Wilkes
  • Martin R. Tant

Organizations

  • Virginia Tech

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Alkenes
  • Block Copolymers
  • Butadienes
  • Chemical Engineering
  • Chemistry
  • Copolymers
  • Engineering
  • Materials
  • Measuring Instruments
  • Mechanical Properties
  • Modulus Of Elasticity
  • Molecules
  • Polymers
  • Stress Strain Relations
  • Stresses
  • Thermal Expansion
  • Thermal Properties

Readers

  • Polymer Science and Engineering.
  • Polymer Science and Technology
  • Theoretical Analysis.

Technology Areas

  • Microelectronics