Mechanism of DNP-Enhanced Polarization Transfer Across the Interface of Polycarbonate/Polystyrene Heterogeneous Blends

Abstract

The same integrated intensity is observed for the interface-PC signal in PC(13C)/PS(12C/*) and PC(13C)/PS(2D/*) thin film blends in a DNP-difference experiment. This result proves that the dominant mechanism of polarization transfer from the electrons in the PS phase to the protons in the PC phase is by direct polarization transfer. The interface-PC signal intensity arises from a 60-A region which is 2% of the PC film thickness. Minor polarization transfer from the DNP-enhanced protons of PS to the PC protons across the PC/PS interface via H-H spin diffusion in PC(13C)/PS(12C/*) may also occur. Even in BDPA-doped homopolymers, the enhancement mechanism is mainly via direct solid-effect polarization transfer, a conclusion based on the similarity of the time dependence of the electron-proton polarization transfers for PS(*) and PS(2D/*).

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Nov 14, 1991
Accession Number
ADA242570

Entities

People

  • Jacob Schaefer
  • Mobae Afeworki

Organizations

  • University of Washington

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Boundaries
  • Chemistry
  • Classification
  • Composite Materials
  • Couplings
  • Difference Equations
  • Electrons
  • Engineering
  • Equations
  • Films
  • Free Electrons
  • Free Radicals
  • Frequency
  • Magnetization
  • Military Research
  • Thin Films
  • Time Dependence

Readers

  • Polymer Science and Technology
  • Positioning, Navigation, and Timing (PNT) Technology.
  • Solar Physics

Technology Areas

  • Microelectronics