Page 85 - 《橡塑技术与装备》英文版2026年1月

TEST AND ANALYSIS

Table 3 Properties of the sample before and after aging, Table 5 Properties of the sample before and after aging,
aging temperature 120 ℃ with an aging temperature of 150 ℃
1 # 2 # 1 # 2 #
Aging time /h tensile Elongation at tensile Elongation at Aging time/ h tensile Elongation at tensile Elongation at
strength T b break E b strength T b break E b strength T b break E b strength T b break E b
0 12 532 14.4 472 0 12 532 14.4 472
168 11.8 276 14 283 8 11.7 366 14.4 352
336 12.1 253 14.4 276 24 11.3 327 14.3 311
672 10.8 196 13.3 206 48 11.1 276 13.6 292
1008 10 162 13.1 192 72 10.8 246 13.3 246
2520 8.7 103 10.9 110 168 9.6 142 13.3 138
4032 8.4 23 9.4 63 2.4 Change in fractional strain energy after

aging
Table 4 Properties of the sample before and after aging,
with an aging temperature of 130 ℃ The loss of tensile strength and elongation can be
1 # 2 # 1 # 2 # described by the fractional strain energy factor at fracture, as
Aging time /h tensile Elongation at tensile Elongation at
strength T b break E b strength T b break E b expressed by Bergstrom (T E ) fO (T E ) f is defined as the ratio of the
0 12 532 14.4 472 product of the tensile strength after aging and the elongation at
24 12.4 326 14.3 336
72 11.4 271 14.4 303 fracture to that before aging. As shown in Equation
168 11 232 13.9 257
336 10.1 191 12.7 214 = (T × E b ) before aging
b
672 9.6 141 11.7 152 （ TE） f (T × E ) (1)
1008 8.8 112 10.4 123 b b after aging
1680 7 62 9.6 36
  1/ (TE ) − 1/ a  = k t '
'

f
ln k = − (E a / RT + ln A
）
'
  1/ (TE ) − 1/ a  = k t '

f
'
A
ln k = −（ E ' a / RT + ln '
）
' t =   1/ (TE） ' f − 1/ a ÷ A ' exp − E a ' / RT）
（


Figure 1 Changes in tensile strength and elongation at break with aging time at different temperatures

In the formula, T b and E b represent the tensile strength for the comparison of materials with different properties. In
and elongation at break, respectively. The fractional strain other studies, the fractional strain energy factor at break has
energy factor at break is a dimensionless parameter that allows been variously used to characterize performance degradation.

Vol.52，2026 ·39·