Valorizing recycled paper through chitosan and glyoxal-chitosan treatments: Synergistic effects on mechanical and physical properties

IF 3.6 4区 材料科学 Q2 MATERIALS SCIENCE, COMPOSITES
Elahe Chiani, Hossein Jalali Torshizi, Alireza Ashori, Hamidreza Rudi, Mohammad Reza Nabid
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Abstract

The present study investigates the efficacy of chitosan and glyoxal-crosslinked chitosan (Chi-Gly) as reinforcing agents for enhancing the mechanical, physical, and functional properties of recycled paper. The research aims to evaluate the comparative performance of these two forms of chitosan in imparting strength characteristics and improved functionality to recycled paper substrates. Chitosan and Chi-Gly solutions prepared via glyoxal crosslinking were incorporated into recycled pulp suspensions at varying dosages. Laboratory handsheets were fabricated, and their properties were systematically evaluated through mechanical testing, morphological analysis, wettability measurements, and antibacterial assays. The results demonstrated significant improvements in the tensile index, burst index, and bending resistance for the chitosan and Chi-Gly treated papers, with the Chi-Gly exhibiting superior reinforcement. Notably, the Chi-Gly treated paper exhibited a higher wet tensile index and lower water absorption capacity than the control. SEM analysis revealed a denser, more cohesive fiber network facilitated by chitosan and Chi-Gly, aiding the reinforcement. The treated papers exhibited reduced hydrophobicity and pronounced antibacterial activity against E. coli (a gram-negative bacterium) and S. aureus (a gram-positive bacterium), with the Chi-Gly treatment outperforming chitosan. Notably, the treatments improved the functional properties without negatively impacting optical brightness. The findings highlight the synergistic effects of glyoxal crosslinking on chitosan’s reinforcing ability and the potential of these biopolymers as sustainable and multifunctional additives for the recycled paper industry.
通过壳聚糖和乙二醛-壳聚糖处理使再生纸增值:对机械和物理特性的协同效应
本研究调查了壳聚糖和乙二醛交联壳聚糖(Chi-Gly)作为增强剂在提高再生纸的机械、物理和功能特性方面的功效。研究旨在评估这两种形式的壳聚糖在赋予再生纸基材强度特性和改进功能性方面的比较性能。将通过乙二醛交联制备的壳聚糖和 Chi-Gly 溶液以不同的剂量加入回收纸浆悬浮液中。通过机械测试、形态分析、润湿性测量和抗菌试验,对实验室手纸的性能进行了系统评估。结果表明,壳聚糖和 Chi-Gly 处理过的纸张在拉伸指数、爆裂指数和抗弯强度方面都有明显改善,其中 Chi-Gly 的强化效果更佳。值得注意的是,与对照组相比,经 Chi-Gly 处理的纸张湿抗张指数更高,吸水能力更低。SEM 分析表明,壳聚糖和 Chi-Gly 使纤维网更致密、更有凝聚力,从而增强了纸张的强度。处理后的纸张疏水性降低,对大肠杆菌(一种革兰氏阴性细菌)和金黄色葡萄球菌(一种革兰氏阳性细菌)的抗菌活性明显提高,其中 Chi-Gly 处理效果优于壳聚糖。值得注意的是,这些处理方法在改善功能特性的同时不会对光学亮度产生负面影响。研究结果凸显了乙二醛交联对壳聚糖增强能力的协同作用,以及这些生物聚合物作为再生纸行业可持续多功能添加剂的潜力。
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来源期刊
Journal of Thermoplastic Composite Materials
Journal of Thermoplastic Composite Materials 工程技术-材料科学:复合
CiteScore
8.00
自引率
18.20%
发文量
104
审稿时长
5.9 months
期刊介绍: The Journal of Thermoplastic Composite Materials is a fully peer-reviewed international journal that publishes original research and review articles on polymers, nanocomposites, and particulate-, discontinuous-, and continuous-fiber-reinforced materials in the areas of processing, materials science, mechanics, durability, design, non destructive evaluation and manufacturing science. This journal is a member of the Committee on Publication Ethics (COPE).
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