Evaluation of Molecular Mobility by Use of Pulse NMR

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Summary

The evaluation of molecular mobility by use of pulse NMR makes it possible to investigate (1) the difference in high order structures, (2) changes in conditions with temperature, (3) correlation with physical properties of materials, and (4) changes with time in crosslinking reaction, among other things.

Evaluation of molecular mobility by use of pulse NMR

(1) Difference in high order structures
Comparison of crystalline conditions
Phase structure of block polymer
(2) Changes in conditions with temperature
Changes in crystals and noncrystals at raised temperature
Mobility of molecular chains in molten state, etc.
(3) Correlation with physical properties of materials
Resilience of urethane
Degree of crosslinking (elastic modulus) of rubber, etc.
(4) Changes with time in crosslinking reaction, etc.
Hardening process of epoxy
Reaction process of urethane
Changes in conditions in crystallization process, etc.

What can be made known by use of pulse NMR

  • The ratio and movement rate of the components showing different movement can be made known by comparing the molecular mobility.
  • Changes in conditions with temperature can be made known by making variable temperature measurements.
  • Changes with time in conditions can be made known by making short-time (1 minute or so) measurements.
  • Information on the observation cores (hydrogen, fluorine) in samples can be obtained, and the evaluation of the physical properties of the resin itself in the presence of a filler and air bubbles is made possible.

Characteristics as to measurement

  • Direct evaluation of molecular mobility
  • No restrictions on sample form
  • Sample amount: 1g
  • Measurement temp.: -70℃~150℃
  • Measurement time: 1 min.

Search Number 1039

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