Depended pH behavior of chitosan on surface modified fibers of Kraft pulp | ||
| تحقیقات علوم چوب و کاغذ ایران | ||
| Article 31, Volume 30, Fall 3 - Serial Number 52, August 2015, Pages 513-524 PDF (399.55 K) | ||
| Document Type: Research Paper | ||
| DOI: 10.22092/ijwpr.2015.101474 | ||
| Authors | ||
| Noraldin Nazarnezhad* 1; Naser Rasol pour hedayati2; Omid Ramazani3 | ||
| 1Associate Prof, Wood and Paper Department, Agricultural and Natural Resources University, Sari, Iran | ||
| 2M.Sc., of pulp and paper industry. Agricultural and Natural Resources University, Sari, Iran | ||
| 3Assistant Prof, Cellulose and Paper Technology Department, Shahid Beheshti University, Ziraab, savadkooh, Iran | ||
| Abstract | ||
| Chitosan is known as a natural polymer which improves strengths of papers. So, in this study investigated improvement of chitosan absorption on modified craft fibers and increase its efficiency. The effects of chitosan were experimented in three levels of 0%, 0.75% and 1.25% on modified kraft fibers surfaces with 3% hydrogen peroxide in different pH levels (5.5, 7 and 8.5). The results showed that chitosan had better performance at low dosages and alkaline conditions. Also surface fibers modification by hydrogen peroxide caused increase of carboxyl groups and fibers anionic charge. Fibers anionic charge with participant of chitosan formed a dual system. The apparent density increased from acidic pH to alkaline. As, the highest apparent density were reached in alkaline pH and 0.75 % of chitosan. Also, tensile index and burst index of paper were reached in alkaline pH and 0.75 % of chitosan. Whereas, chitosan and the surface modified fibers of kraft pulp did not have a significant level on the tear index | ||
| Keywords | ||
| : Chitosan; Peroxide hydrogen; Modification; pH; Kraft pulp; Physical & Mechanical Properties | ||
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