Abstract
Industrial applications of terahertz (THz) technology are becoming more widespread. In particular, novel evaluation methods for essential rubber products are being developed. THz absorbance spectra of various rubber polymers and reagents enable visualization of filler dispersions and vulcanization reactions. Here, improved visualization of the vulcanization reaction in thick rubber samples is discussed. Silica macro-dispersion is also analyzed because it is a general filler in automobile tires and has been difficult to evaluate with conventional techniques.
Highlights
Terahertz (THz) waves are located in the electromagnetic band between the far-infrared and the microwave regions corresponding to the fingerprint region of some materials and can exhibit penetration of materials except for metals [1]
The transmission loss due to Fresnel reflections from rubber-air interfaces was estimated to 4~5% per interface; all the results processed in this study were calculated without considering this loss
This is because it was difficult to obtain an accurate loss for each rubber sample, and it was expected that the magnitude of the loss was not so critical when the THz transmission was evaluated as absorbance having a logarithm scale
Summary
Terahertz (THz) waves are located in the electromagnetic band between the far-infrared and the microwave regions corresponding to the fingerprint region of some materials and can exhibit penetration of materials except for metals [1]. Industrial applications are limited so far, and a few, such as characterization of paint films [7] and tablet coatings [8], were reported Rubber products, such as automobile tires, rubber bands, rubber balls, insulators, and O-rings, are essential to modern society. It has been reported that THz light could nondestructively detect the mesh network structure in the vulcanization reaction and the depth of the cure condition in rubber products having thicknesses greater than 10 mm [10]. These techniques are based on the transmission capability of THz radiation.
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