Viscoelasticity of a vitrified hindered phenol compound during thermal annealing

The viscoelasticity of vitrified 3,9-bis{1,1-dimethyl-2[β-(3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy] ethyl}-2, 4, 8, 10-tetraoxaspiro [5,5]-undecane (abbreviated as AO-80) during the annealing process was investigated by DMA under the solid shearing model for the first time. The results showed that vitrified AO-80 obtained by quenching from its melting state has super-high damping properties (tan δ > 26), which are much higher than any polymer materials (tan δ < 3). Moreover, the vitrified AO-80 annealed at 80 °C under different annealing time has different aggregate structure, resulting in the variation of its viscoelasticity. With the increasing of annealing time the peak value of tan δ decreased, but still higher than any other polymers. These results also provided the evidences of the damping properties improvement of polymer composites added AO-80.