| 摘要 |
Normally solid, moldable polyamides, with elastomeric character, having diamine-derived structural units of the formula <IMAGE> wherein each A is individually selected from the group consisting of 5-methylnonamethylene, 2,4-dimethyloctamethylene, 2,4,6-trimethylheptamethylene, and 4-isopropylheptamethylene; and diacid-derived structural units of the formula <IMAGE> wherein each n is an integer individually selected from the group consisting of 5, 7, 9, and 11. Minor amounts of other polyamide-forming materials can be included in the polyamide to provide up to 30 percent of the nitrogen atoms and up to 30 percent of the carbonyl groups. These polyamides possess elastomeric or energy-absorbing character, as evidenced by their high impact strength, low flexural modulus, and high elongation.
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