Review Article
50 Years of the K-BKZ Constitutive Relation for Polymers
Table 1
Relaxation spectra and material constants for two polymer melts obeying the K-BKZ model: LDPE at 160°C [
45] and HDPE at 190°C [
46].
| LDPE | HDPE | | | k | (s) | (Pa) | | k | (s) | (Pa) | |
| 1 | 1.28 × 10−4 | 4.50 × 105 | 1 | 1 | 0.537 × 10−8 | 0.236 × 109 | 0.6 | 2 | 2.51 × 10−3 | 98,795 | 1 | 2 | 0.782 × 10−5 | 0.576 × 107 | 0.6 | 3 | 2.06 × 10−2 | 48,899 | 0.18 | 3 | 0.263 × 10−2 | 99,508 | 0.6 | 4 | 1.62 × 10−1 | 22,089 | 0.45 | 4 | 0.10591 | 92,960 | 0.6 | 5 | 1.224 | 8,842 | 0.049 | 5 | 0.168 × 10−1 | 0.104 × 106 | 0.6 | 6 | 6.733 | 3,397 | 0.026 | 6 | 0.70421 | 46,958 | 0.6 | 7 | 43 | 948.5 | 0.024 | 7 | 4.2105 | 12,169 | 0.6 | 8 | 248 | 287 | 0.014 | 8 | 30.494 | 1,438.6 | 0.6 |
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