4. Conclusions
As the result of investigating the effect of different zinc oxide
types (active zinc oxide and zinc oxide coat on CaCO3 core) on age-
Table 7
Tention of tensile stress, elongation and 100% modulus upon ageing in nitric acid
vapors.
Ageing period (h) Retention of
Tensile stress (%) Elongation (%) 100% Modulus (%)
SBR-1 SBR-2 SBR-1 SBR-2 SBR-1 SBR-2
0 100 100 100 100 100 100
4 87 93 93 94 102 100
9.5 76 76 78 89 118 107
17 77 85 78 84 111 106
24 76 77 78 80 125 126
45 71 71 80 78 141 148
168 67 63 69 66 185 166
360 58 53 62 56 193 217
720 45 48 64 61 135 130
Table 8
Retention of tensile stress, elongation and 100% modulus upon UV ageing.
Ageing period (h) Retention of
Tensile stress (%) Elongation (%) 100% Modulus (%)
SBR-1 SBR-2 SBR-1 SBR-2 SBR-1 SBR-2
0 100 100 100 100 100 100
72 94 101 97 101 96 100
Table 9
Retention of tensile stress, elongation and 100% modulus upon weatherometer
ageing.
Ageing period (h) Retention of
Tensile stress (%) Elongation (%) 100% Modulus (%)
SBR-1 SBR-2 SBR-1 SBR-2 SBR-1 SBR-2
0 100 100 100 100 100 100
67.5 89 105 89 96 108 110
0
2
4
6
8
10
12
14
16
18
20
0 2 4 6 8 10 12 14 16
Ageing time (days)
Oil intake (%)
SBR- 1
SBR- 2
Fig. 13. Weight gain upon ageing in oil.
10
11
12
13
14
15
16
17
18
0 5 10 15
Aging time (days)
Tensile stress at break (Mpa)
SBR -1
SBR -2
Fig. 14. Change of tensile stress at break upon ageing in oil.
400
450
500
550
600
650
700
750
800
850
900
0 2 4 6 8 10 12 14 16
Ageing time(days)
Elongation atbreak (%)
SBR-1
SBR-2
Fig. 15. Change of elongation at break upon ageing in oil.
1
1.1
1.2
1.3
1.4
1.5
1.6
0 2 4 6 8 10 12 14 16
Ageing time (days)
100% Modulus
SBR-1
SBR-2
Fig. 16. Change of 100% modulus upon ageing in oil.
Table 10
Retention of tensile stress, elongation and 100% modulus upon ageing in oil.
Ageing period (h) Retention of
Tensile stress (%) Elongation (%) 100% Modulus (%)
SBR-1 SBR-2 SBR-1 SBR-2 SBR-1 SBR-2
0 100 100 100 100 100 100
2 82 90 83 89 92 91
5 81 81 80 88 92 91
9 79 87 79 88 87 87
14 76 74 76 77 84 85
1538 N. Vatansever, S. Polat / Materials and Design 31 (2010) 1533–1539
ing properties of SBR compounds; it is concluded that similar cure,
mechanical and ageing properties may be obtained by using less
ZnO. Consumption of lower amounts of ZnO is preferred for environmental
as well as economic reasons and studies for this purpose
should be continued.