Research Article
The Physical Modification of a Natural Rubber-Polypropylene Thermoplastic Elastomer Blend by Azobisformamide Blowing Agent
Table 2
Swelling index for the different vulcanizates.
| | Ingredient |
Composition (quantities in parts per hundred parts (phr) by weight of rubber) |
| | NR | 70 | 70 | 70 | | PP | 30 | 30 | 30 | | ABFA | 0.4 | 0.8 | 0.8 | | Sulfur | 1 | 1 | — | | TMTD | 1 | — | 1 | | ZnO | 5 | 5 | — | | Stearic acid | 1 | 1 | — | | Swelling index | 2.3571 | 1.7210 | 2.6773 |
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