The Effect of Waste Fodder Potato Proteins on the Mechanical Properties of Carboxylated Acrylonitrile-Butadiene Rubber

Table 1

Composition of the rubber compounds and the effect of WPFF on the curing characteristics and mechanical properties of rubber compounds and vulcanizates of XNBR.

	XNBR (Krynac X7.50)
Content	XNBR	WFPP/XNBR	WFPP + ZnO/XNBR
WFPP [phr]	—	5	—
WFPP + ZnO [phr]	—	—	5 + 5
ZnO [phr]	5	5	—
Other ingredients: Carboxylated acrylonitrile-butadiene rubber XNBR (Krynac X7.50 carboxylated nitrile
rubber)–100phr, sulphur–2,5phr, dibenzothiazyl disulphide (MBTS)–1,5phr, Stearin–2phr.
𝐿^∗min [dNm]	10,10	12,10	13,00
Δ𝐿 [dNm]	94,60	98,40	98,20
𝜏90 [min]	30	21	19
𝑎𝑓 [—]	—	0,80	0,76
𝜈T [10^4 mol/dm^3]	2,6745	2,6898	2,81
/NH3 [10^4 mol/dm^3]	1,5623	1,4412	1,35
Δ𝜈   Δ𝑉NH3=𝑉T−𝑉T/NH3 [mol/dm^3]	1,11	1,25	1,46
A1   A1=(Δ𝑉NH3/VT)∗100% [%]	41,58	46,47	51,95
S100 [MPa]	2,22	2,25	2,40
S200 [MPa]	3,72	3,36	3,79
S300 [MPa]	7,19	5,59	6,67
Ts [MPa]	10,17	10,38	13,76
Eb [%]	334	385	315
Thermal ageing S [MPa∗%/MPa∗%]	0,56	0,76	0,96
Qw–equilibrium swelling in water [mg/mg]	0,068	0,087	0,090
Biodecompisition
TS [MPa]	10,10	10,30	11,60
Eb [%]	313	299	305
Hardness A [°Sh]	58	61	59
Hardness after biodecomposition [°Sh]	57	56	59