Assessment of cellulose nanocrystals as mechanical reinforcement paper additives
Cellulose nanocrystals (CNC) are nanosized crystals of cellulose chains that can be extracted from several cellulose source and exhibit mechanical properties superior to Kevlar or glass fiber. These CNC were isolated using sulfuric acid hydrolysis from bleached Eucalyptus spp. Kraft pulp with high y...
-д хадгалсан:
| Үндсэн зохиолч: | |
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| Формат: | masterThesis |
| Хэл сонгох: | англи |
| Хэвлэсэн: |
2021
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| Нөхцлүүд: | |
| Онлайн хандалт: | https://hdl.handle.net/20.500.12008/34603 |
| Шошгууд: |
Шошго байхгүй, Энэхүү баримтыг шошголох эхний хүн болох!
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| Тойм: | Cellulose nanocrystals (CNC) are nanosized crystals of cellulose chains that can be extracted from several cellulose source and exhibit mechanical properties superior to Kevlar or glass fiber. These CNC were isolated using sulfuric acid hydrolysis from bleached Eucalyptus spp. Kraft pulp with high yield (> 70 %). CNC were successfully neutralized using a sequence of short centrifugation washing steps, drying in a transparent rigid polymer. The CNC were chemically modified at its surface prior to be used as additive to improve the mechanical properties of paper sheets. The addition of CNC obtained from three different conditions (after hydrolysis, after alkalinization and after oxidation with potassium meta periodate) were added in three levels to the paper. The results showed that acid and alkalinized CNC did not provoke a significant nor incremental increase in mechanical properties; but oxidized CNC addition results in large and continuous improvement of the mechanical properties, specially Tensile Index, Burst Index, and Folding Endurance. |
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