Strain Induced Plastic-to-Rubber Transition of An SBS Block Copolymer and Its Blend with PS.

Abstract

The strain softening phenomenon in poly(styrene-b-butadiene-b-styrene) and its blends with polystyrenes were investigated by means of electron microscopy and small angle x-ray scattering. Samples were cast from mixed solvents of tetrahydrofuran and methyl ethyl ketone (90/10 by volume). The structure of these samples consist of randomly oriented alternating lamellar domains of the two components. Their mechanical behavior is plastic-like in that they exhibit yielding and necking when first stretched to around 200%. After the necking has propagated throughout, the samples show typical rubber-like behavior. This phenomenon may be called the strain induced plastic-to-rubber transition, and is believed to occur as a result of structural changes from alternating lamellar domains to fragmented PS domains dispersed in a PB matrix.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1978
Accession Number
ADA055905

Entities

People

  • J. Diamant
  • K. Saijo
  • M. Fujimura
  • Meikun Shen
  • T. Hashimoto

Organizations

  • University of California, Berkeley

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Alkenes
  • Block Copolymers
  • Chemical Engineering
  • Chemistry
  • Copolymers
  • Dispersions
  • Electron Microscopy
  • Mechanical Properties
  • Polymer Chemistry
  • Polymers
  • Scattering
  • Tensile Modulus
  • Tensile Strain
  • Tensile Stress
  • X Ray Scattering
  • X Rays
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Polymer Science and Technology

Technology Areas

  • Microelectronics