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| sample | abbreviation |
|---|---|
| control PVC | PVC |
| PVC + PVC–PEI-coated composites | PVC–PEI |
| PVC + PVC–PEI coated + NAC immobilized | PVC–PEI–NAC |
| PVC + SNAP blended + PVC top coated | PVC–SNAP |
| PVC + SNAP + PVC–PEI coated + NAC immobilized | PVC–SNAP–PEI–NAC |
