Properties of Vulcanized Polyisoprene Rubber Composites Filled with Opalized White Tuff and Precipitated Silica

Table 5

Kinetic parameter and values for 𝐸_ac and 𝐸_ar for NR/PSi and NR/OWT rubber composites.

Sample	NR/PSi (phr)	NR/OWT (phr)	𝑘1(s^−1)	𝑘2(s^−1)	𝑘3(s^−1)	𝑘4(s^−1)	𝐸ac  (j mol^−1)	𝐸ar (j mol^−1)	𝐸ar/ 𝐸ac
1	100/50	—	2.9×10^−2	1.2×10^−2	4.2×10^−2	1.9×10^−3	6×10^4	8.9×10^4	1.5
2	—	100/20	3.7×10^−2	7.7×10^−4	4.7×10^−2	1.4×10^−3	4.4×10^4	9.9×10^4	2.3
3	—	100/40	3.8×10^−2	6.6×10^−4	5×10^−2	1.5×10^−3	4.8×10^4	14.7×10^4	3.1
4	—	100/50	4.7×10^−2	5.3×10^−4	5.1×10^−2	1.5×10^−3	1.2×10^4	17.9×10^4	14.9
5	—	100/60	3.8×10^−2	8.5×10^−4	5.2×10^−2	1.9×10^−3	5.6×10^4	14.2×10^4	2.5

𝑘₁,𝑘₂ at 𝑇₁(180^∘C).
𝑘₃,𝑘₄ at 𝑇₂(190^∘C).