Mechanical properties of highly filled elastomers. Part I: Relationship between characteristics, shear moduli and tensile strength
conference paper
The effect of the size and of the amount of NaCl filler on the mechanical properties of polyurethane rubber was investigated. The tensile tests at room temperature showed that with the increase of filler content the characteristic rubberlike stress-strain curves change shape and exhibit a definite yield point coinciding with the onset of de-wetting. The yield strength was found to increase considerably with the decrease of the filler size. Torsion tests at small strains show that the deformation behavior is chiefly determined by the volume fraction of filler and only slightly depends on filler size. All filled and unfilled samples show a softening region where the shear modulus drops over more than two powers of ten and where the damping passes through a maximum. The position of the softening temperature only slightly depends on amount or size of filler. The levels of the shear moduli in the glassy and rubbery states increase considerably with filler content and were found to be independent of filler size. These levels may be predicted by the theory of Van der Poel from the amount of filler, the shear modulus of the filler and the corresponding level of the unfilled rubber.
TNO Identifier
282998
Source title
Proceedings 4th International Congress on Rheology, Providence, USA, 1963
Editor(s)
Lee, E.H.
Pages
241-263
Files
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