Characterization of the Interfacial Regions of Heterogeneous Blends of Immiscible Polymers by Dynamic Nuclear Polarization (13)C NMR

Abstract

By doping one component of an immiscible blend of two polymers with a stable free radical, we can generate a dynamic nuclear polarization (DNP) enhanced C NMR signal from chains of the updoped component which are within 100 Angetroms of the interface. DNP-enhanced NMR relaxation experiments performed on polycarbonate/free-radical-doped-polystyrene blends show that polycarbonate chains in the vicinity of the polystyrene interface are more densely packed than are polycarbonate chains in the bulk state. We propose to perform DNP-selected, NMR relaxation experiments on a variety of polycarbonate-polystyrene blends with known thermal histories and solvent exposure. The results of these experiments could lead to a connection between microscopic interface properties and macroscopic mechanical properties.

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Document Details

Document Type
Technical Report
Publication Date
Oct 31, 1990
Accession Number
ADA236285

Entities

People

  • Jacob Schaefer

Organizations

  • University of Washington

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acquisition
  • Chemistry
  • Computer Simulations
  • Couplings
  • Cross Polarization
  • Dielectric Polymers
  • Diffusion
  • Electrons
  • Films
  • Free Radicals
  • Frequency
  • Magnetic Resonance
  • Nuclear Magnetic Resonance
  • Polarization
  • Polymers
  • Quantum Properties
  • Two Dimensional

Readers

  • Polymer Science and Technology
  • Quantum Chemistry