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Elastomers: sulphur or peroxide cross‐linked? An analytical approach
Author(s) -
Affolter Samuel
Publication year - 2001
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200103)165:1<133::aid-masy133>3.0.co;2-b
Subject(s) - vulcanization , elastomer , varnish , sulfur , chemistry , pyrolysis , mass spectrometry , process engineering , organic chemistry , natural rubber , chromatography , engineering , coating
The analytical methods presented in this study lead to a characterisation of the vulcanisation system of unknown elastomers. The chemical determination of sulphur gives a first impression of the system. However, it cannot be proved with any degree of certainty weather a product is sulphur cross‐linked or not. Other wet chemical methods (colour reactions) are more suitable for quality control of already known systems. Most spectrometric methods (infrared spectrometry, Raman spectrometry, nuclear resonance spectrometry) are only of use for special applications and for research. A more precise characterisation is obtained by means of chromatographic methods , i.e. by identifying the products, which originated from thermal degradation of the cross‐linking reagents (sulphur, sulphur donators, peroxides). Evolved‐Gas‐Analysis (EGA) and pyrolysis gas chromatography with adequate detectors proved to be very successful as chemical‐analytical methods for such investigations. In order to make a reliable statement about the vulcanisation system of unknown elastomeric material, the results of several analytical methods have to be collected and evaluated.