Evaluation of Physical Properties of Earthquake-Resistant Mats

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Summary

A comparative study was made of two urethane-based earthquake-resistant mats showing different adhesive strength by performing an evaluation of viscoelasticity and molecular mobility by pulse NMR spectroscopy.

What can be made known by these analytical methods

Tackiness measurement :Tackiness is an index of adhesive strength for fixing an earthquake-resistant mat. It is equal to the force for peeling the mat.
Viscoelasticity measurement :Storage modulus (E’), loss modulus (E’’) and tanδ ( E’’ /E’) are determined.
  • The higher the value of the index of Storage modulus (E’) is, the higher the crosslinking degree is.
  • The higher the values of tanδ vibration absorption and glass transition temperature is, the higher the vibration absorption property is.
Pulse NMR spectroscopy :Comparison of molecular mobility (the ratio of components showing different mobility and the velocity of motion)

Product B shows high adhesive strength even at low temperature.

Produce B is low in absolute crosslinking degree and high in vibration absorption. Furthermore, Product B contains a component that exhibits glass transition at low temperature.

  • Product B demonstrating high adhesive performance is lower in relative crosslinking degree than Product A and superior to Product A in vibration absorption properties.
  • Product B has a section that shows high mobility even at low temperature and it seems that because of this, Product B demonstrates high performance even at low temperature.

Search Number 6D006

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