Chemistry Reference
In-Depth Information
TABLE 8.3
Effect of Type of Elastomer Engage Modified With Silane A-174 on the
Properties of the Dynamically Cross-Linked PP/EOE-55/45% Blends
Elastomer
Engage I
Engage II
Engage III
Blend properties
MFR, g/10 min
(2.16 kg, 190 °C)
1.86
1.80
4.07
Gardbess, °Sh, D
42/39
42/40
39/38
∈
B,
%
720
752
660
σ
M,
MPa
25.2
29.5
21.9
σ
100%,
MPa
11.1
12.6
11.0
σ
y
, MPa
11.1
12.6
11.1
24.0
27.9
39.9
∈
y
, %
Symbols; ∈
100%
-
tension at 100% elongation, σ
M
- maximum tension, ∈
B
- relative
elongation at the tear off, σ
y
- yield point, ∈
y
- elongation on yield point.
Such behavior of elastomer Engage III blended with PP resulted prob-
ably from its different rheological characteristic, including its four times
lower viscosity and very high flow index as compared to Engage I, which
was recognized as the most suitable for production of nonsaturated blends
using the dynamic vulcanization method.
Blend with the selected optimum contents iPP/Engage I 55/45% and
the selected cross-linking system (silane/peroxide 3/0.03%) were charac-
terized by high thermal stability, independent from type of the material
employed to cross-linking silane. It has been confirmed with tests of TGA
of blend containing silane A-172 and silane A-174 (samples PL-1 and PL-
2, respectively), what is shown in Table 8.4 in temperature of 230 °C the
decrease of weight did not exceed 0.5%.
