Abstract :
Polyurethane elastomers with potential for
applications in damping bearings were synthesized with
1,6-hexamethylene diisocyanate, 4,40-methylenebis-(phenylisocyanate),
poly(1,4-butane)diols (Terathane 1400), 1,4-
butane diol 1,6-hexane diol and glycerin chain extenders.
The glass-transition temperatures of the materials ranged
from -42 to -75 C and were higher for polymers based
on 4,40-methylenebis-(phenylisocyanate) and with higher
hard segment (HS) contents. The tensile strengths of the
materials were 20–55 MPa and the tensile moduli were 30–
134 MPa. These increased with increasing HS content.
Interchain cross-linking improves thermal stability, which
was measured by thermogravimetric analysis and differential
scanning calorimetry. The structure and amount of
HS used causes a significant variation in the properties of
cross-linked elastomers
