Transition Temperatures of Acrilan in Relation to Dyeing Properties

The transition temperatures of Acrilan film have been determined by observing the viscoelastic behaviour in air and solutions. Two transition temperatures are observed in water, the higher being at 84°C. This is of importance in the dyeing of Acrilan fibres, and correlates more closely with dyeing properties than does the Tg observed at 56°C. Relationships between the transition temperatures and dyeing behaviour in the presence and absence of a dyeing assistant are discussed.