The glass transition temperatures of natural rubber compounds cured with dicumyl peroxide and sulphur were measured on a Metravib Viscoelasticimeter. Tan 6 versus temperature curves of compounds vulcanized with peroxide show two well defined relaxations associated with the glass transition. Compounds cured with sulphur show only one relaxation. Dynamic deformations of small amplitude were superimposed on large static deformations. It was found that the intensity of the loss tangent associated with the glass-rubber transitions tends to decrease with increasing static deformation.
Посилання на статтю:
Dynamic mechanical properties of natural rubber vulcanizates with different curing systems and static strain / Luis Gonz61ez Hern&ndez*, Luis Ibarra Rueda, Andr6s Rodriguez Diazand Celia Chamorro Antbn // Polymer. – 1992. – Vol 33. – P. 3635-3638.