Semipermeable Membrane From Ionomeric Self-Assembling Block Copolymer

Abstract

Morphological studies have been performed on novel polystyrene-polyisobutylene- polystyrene (PS-PlB-PS) triblock copolymer films made by different processes. The PS-PIB-PS films are composed of approximately 30% polystyrene end blocks. Small-angle x-ray scattering (SAXS) and transmission electron microscopy (TEM) confirm that a self-assembled, segregated cylindrical morphology forms in the copolymer. Dynamic mechanical analysis (DMA) is used as a tool to investigate the structure-property relationships in these polymers. Fourier-transform infrared (FTIR) spectroscopy and solvent-sorption studies have validated the membrane transport properties. Modified PS-PJB-PS copolymers have also been characterized. Modifications of the copolymers were carried out by converting approximately 20% of the polystyrene end blocks to styrene-sulfonic acid. The presence of sulfonic acid groups disrupts the morphology and significantly enhances water transport properties. Morphological features of the copolymers are discussed as they relate to mechanical and transport properties.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 2001
Accession Number
ADA387974

Entities

People

  • David A. Reuschle
  • Dawn N. Crawford
  • Eugene G. Napadensky
  • Jim Sloan
  • Nora C. Tan

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Human Systems
  • Weapons Technologies

DTIC Thesaurus Topics

  • Alcohols
  • Alkenes
  • Block Copolymers
  • Dielectric Polymers
  • Diffusion Coefficient
  • Electron Microscopy
  • Low Temperature
  • Materials
  • Molecules
  • Physical Properties
  • Polymeric Films
  • Polymers
  • Scattering
  • Sulfonic Acids
  • Transmission Electron Microscopy
  • Transport Properties
  • X Ray Scattering

Fields of Study

  • Materials science

Readers

  • Polymer Science and Technology

Technology Areas

  • Microelectronics