Tert-Butanol

Chemical Genesis

Homolytic cleavage of the oxygen-oxygen bond in tert-butyl peroxides creates alkoxy radicals that undergo further chemical reactions during the moulding process. When these radicals extract hydrogen from the polymer chain or other molecules, tert-butanol is produced as a byproduct. This chemical pathway occurs concurrently with the crosslinking or polymerization reactions in the extruder barrel.

The amount of the byproduct generated depends on the initiator concentration and the melt temperature.

Processing Effects

Volatile residues trapped within the polymer melt can lead to surface defects and gas bubbles during high-temperature forming operations. If high concentrations of tert-butanol are retained in the resin, they can cause splay or pinholes on the surface of the moulded part. These cosmetic defects can lead to high scrap rates during injection moulding or sheet extrusion.

To prevent this, processors use post-moulding degas processes or extended drying times to drive off the volatile compounds.

Process Detection

Quantification of residual volatile organic compounds in moulded parts is critical for ensuring compliance with industrial and health standards. In laboratory tests, tert-butanol is typically measured using headspace gas chromatography with flame ionization detection. This method allows processors to verify that the concentration of the byproduct lies below the limit specified for the material.

Regular monitoring of these levels ensures that the final products maintain their structural integrity and are free of unpleasant chemical odors.