Table 4. Nitrogen Contents of Different Composite Materials before and after Aging.
| Sample | Before aging | After aging | Nitrogen content increase rate |
|---|---|---|---|
| 4010NA | 1.60% | 1.98% | 23.8% |
| 4020 | 1.64% | 2.04% | 24.4% |
| GMA-g-PPDA | 1.62% | 1.92% | 18.5% |
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