Abstract
Technical cashew nut shell liquid (CNSL) was analyzed to investigate its constituents using gas chromatography/mass spectrometry (GC/MS). The results showed that it consists of cardanols and cardols but not 2-methylcardol. After the addition of hexamethylenetetramine to technical CNSL, the mixture was polymerized into the cashew resin film by autoxidation. The film was analyzed using two-stage pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). It was found that the cashew resin is terminated with saturated cardols and cardanols after the pyrolysis at 400°C. This pyrolysis effectively identifies the cashew resin from the other resins and saps. Furthermore, pyrolysis at 500°C revealed that the autoxidative side-chain/side-chain C-C coupling accelerated the cross-linking of trienyl- and dienylcardanols during polymerization.
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