Transient Structures and Rheological Properties of SBS Block Copolymer Melts.

Abstract

Shear stress growth and relaxation behavior of two well-characterized SBS block copolymers has been studied using a Melt Elasticity Tester. Effects of casting solvents on the transient rheological properties and structure variation during flow are determined via samples cast from THF/MEK and cyclohexane. the temperature dependence of the observed shear stress at the yield point and steady-state viscosities provides insight into the mechanism of structure breakdown induced by the applied flow. Shear stress relaxation upon cessation of flow reveals complex behavior, depending on temperature, casting solvents and duration of previous flow. Strain recovery data have also been obtained, indicating strong dependence on the composition of the copolymers. Significance of these observations in terms of the melt structure of SBS is discussed. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jun 08, 1982
Accession Number
ADA115927

Entities

People

  • David S. Soong
  • Naomi Sivashinsky
  • Tak Jin Moon

Organizations

  • University of California, Berkeley

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Block Copolymers
  • Chemical Engineering
  • Chemistry
  • Classification
  • Copolymers
  • Cyclic Hydrocarbons
  • Cyclohexanes
  • Elastic Properties
  • Geometry
  • Molecular Weight
  • Polymeric Films
  • Polymers
  • Residual Stress
  • Steady Flow
  • Steady State
  • Three Dimensional
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Fluid Mechanics and Fluid Dynamics.
  • Materials Science and Engineering.
  • Polymer Science and Technology

Technology Areas

  • Microelectronics