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Urethane groups, thermal stability

Increase in crosslink density, type of crosslinking and introduction of isocyanurate ring structures in the polymer-chain backbone has a strong beneficial effect on the thermal stability of polyurethanes and is discussed later in this chapter. It is known that thermal stability increases with increasing isocyanate content of urethane elastomers, and in addition to the formation of the thermally stable isocyanurate rings, stability is influenced by the different types of urethane-based groups formed, as shown in Table 3.9a. [Pg.61]

Thermal stability of urethane group is relatively low. It was already stated that it depends on the groups to which it is attached, being the highest for aliphatic isocyanate aliphatic alcohol (approx, dissociation temperature 250 °C), then aliphatic alcohol aromatic... [Pg.542]

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Group thermal stability

Stability groups

Thermal group

Urethane ->• stabilizer

Urethane groups

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