Influence of Filler from a Renewable Resource and Silane Coupling Agent on the Properties of Epoxidized Natural Rubber Vulcanizates

Table 4

Cure characteristics of gum and filled ENR-25 vulcanizates with various RHA contents or 30 phr of silica, with and without silane coupling agent (Si69).

Sample	Min. torque; (, dN m)	Max. torque; (, dN m)	Delta torque; (, dN m)	Scorch time; (, min)	Cure time; (, min)
Gum	1.14	5.6	4.46	3.84	8.16
RH	1.44	5.73	4.29	3.10	4.61
RH	1.55	6.15	4.60	2.70	4.28
RH	1.82	7.71	5.89	2.40	4.59
RH-Si69	1.16	5.97	4.81	1.48	2.89
RH-Si69	1.23	6.68	5.45	1.27	2.69
RH-Si69	1.36	8.17	6.81	1.03	2.73
	5.13	14.45	9.32	3.67	19.54
-Si69	4.61	16.72	12.11	2.68	9.28