Influence of the blend composition in the internal friction of NR/SBR compounds

A. GHILARDUCCI; S. CERVENY; H. SALVA; C. L. MATTEO; A. J. MARZOCCA

Kautschuk Gummi Kunststoffe

Hüthig

Lugar: Heidelberg; Año: 2001 vol. 54 p. 382 - 386

0022-9520

Mechanical dynamic measurements were used in this work to analyze the behavior of cured, carbon black-filled NR/SBR blends using a sulfur/accelerator system. The loss tangent (tan 6) of the compounds was studied in the frequency range between 10-3 and 10 Hz and temperatures between 80 and 260 K. Measurements were performed with an automated sub-resonant forced pendulum. A new model was applied to loss tangent data, based on the consideration of the phase network. A secondary transition (p relaxation) appears in the blends at temperatures between 100 K and 160 K, in addition to the glass transition. This peak is analyzed in terms of the rotation of the cis and vinyl units from butadiene of SBR.