The anionically polymerized polyisoprene has the highest elongation
at break, the natural robber sample the lowest.
Both initial and aged elongations
of CNSL compound were higher than both TP 95/DOP compounds (figure 9).
For same hardness compounds, the higher surface area blacks provided moderately stifler compounds (Ml00 and M200) with a slight improvement in elongation
to break values.
In figure 2a, which compares the tensile strength and the tension set from a 100% elongation
for a range of P-E polymers, both plastomers and P-E polymers have lower tension set than EPR and iPP.
Hoechst's McNally says the company has extended its Riteflex line with new grades that possess the high molecular weight necessary for advanced levels of elongation
(over 300%), while retaining high melt flow.
The SBC at 4 phr and 1 and 2 phr levels of MPDM all gave somewhat higher losses of elongation
after aging than the coagent-less control.
The larger the flaw, the more it reduces tensile strength and breaking elongation
Two of the most common indicators of age resistance used in industry are retention of tensile strength and retention of elongation
The only exception to this is the air-aged elongation
change and these values are higher for the scorch resistant version, which could be attributable to the higher initial elongation
as the final elongation
values are all very similar.
Note should be made that the construction of coiled metallic springs allows for a high elongation
while only imposing a small flexural strain on individual segments.
The mechanical probing Mechanical properties like modulus at different strains, tensile strength, tear strength and elongation
at break are all functions of degree of crosslinking.
range) and [eta] is a carbon black networking factor based on dynamic elastic modulus: