Thiols, curative

The curative mechanism of heat stabilizers accounts for a reduction in the rate of formation of polyene sequences -[CH=CH]n- and deactivation of hydroperoxides in PVC (Andreas, 1990). Organotin maleate 44 or thiol 97 released from 45 were reported to stop the growth of polyenes by adding to the C=C bond in PVC. 

Other curatives, which react through addition mechanisms are phenolic resins, particularly if the hydroxyl/epoxy reaction is catalysed using a tertiary amine (usually accomplished at elevated temperatures), thiols, polysulphides and mercaptans (can be formulated to give very rapid cures), polyetheramines (relatively slow cures, which can be accelerated with nonyl phenol), polyamides (less reactive than their amine counterparts) and amidoamines (characterized as having very long pot lives). 

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