Analysis of Degradation of Rubber: Correlation with Molecular Mobility
- Pulse NMR Analysis -

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Summary

Due to degradation, rubber declines in flexibility and grows in compression set (CS). The use of pulse NMR makes it possible to analyze the correlation between CS and molecular mobility and use it as an index of the degree of degradation (or prediction of life).

Correlation between compression set (CS) and molecular mobility as determined by pulse NMR

  • Regardless of degradation conditions, the correlation between CS and transverse relaxation time (T2) is determined.
  • It is possible to predict the life of of materials for secular use by conducting pulse NMR analysis from the CS/T2 correlation.
  • A combination of the determination of the remaining plasticizer amount and the degree of swelling makes the analysis of the factors causing a decline in CS.

Correlation between compression set (CS) and T2 value of pulse NMR

Advantages of pulse NMR (as compared with CS determination)

  Pulse NMR Compression set (CS)
Sample form Any form Cylindrical shape 29mm in diameter and 12.5 in thickness
Sample amount 1g
Measurement time Within 1 minute Shortest time 24 hours
Object of evaluation Rubber itself (excluding the effects of an inorganic filler and foam) Including materials added

Search Number 1041

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