High Strength/High Modulus Aromatic Heterocyclic ABA Block Copolymers

Abstract

This paper describes our research on the synthesis and properties of ABA block copolymers composed of a rigid-rod (B) block for reinforcement and a flexible coil (A) block as the matrix. In addition to better processability (Ccr), it was anticipated that the block copolymer would have better mechanical strength than those from physical blends of the rigid-rod/flexible coil composition. In the block copolymer, the rigid-rod constituent would be chemically bonded to the flexible coil matrix, while in the physically blended molecular composite the reinforcing rigid-rod polymer is only physically entangled in the matrix. Hence, the translation of stress or strain from the reinforcing rigid-rod molecule in the matrix should be more efficient in the block copolymer than in the physical blend. This would not only provide higher tensile strength, but also fracture toughness and dimensional stability.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1987
Accession Number
ADA191666

Entities

People

  • F. E. Arnold
  • T. T. Tsai

Organizations

  • Wright Laboratory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Air Force
  • Block Copolymers
  • Chemical Synthesis
  • Chemistry
  • Fiber Spinning
  • Fibers
  • Heat Treatment
  • Hydroxides
  • Materials
  • Materials Laboratories
  • Materials Science
  • Microscopes
  • Organic Chemistry
  • Polymers
  • Rigid Rod Polymers
  • Tensile Properties
  • Tensile Testing

Readers

  • Polymer Science and Engineering.
  • Reinforced Composite Materials
  • Solar Photovoltaics and Thermoelectric Devices.

Technology Areas

  • Microelectronics