Abstract

Herein, a great potential approach initiated by laccase is applied to graft the biopolymers (chitosan and phenols) onto the unbleached Kraft pulp fibers to enhance the hydrophobicity and strength. The results showed that the chitosan and laccase/phenols exhibited a synergistic action on the significant improvement of the hydrophobicity of the KP pulp fibers. Compared with the base paper, a high sizing degree value (227.08 s) was achieved when the fibers were treated by the laccase/4-hexyloxyphenol/chitosan (Lac/HP/CTS) system. The water retention value of the corresponding KP fibers reduced from 176.8 to 171.3%, and the Kappa number of treated fibers increased from 26.8 to 29.3, confirming the successful graft of HP onto the fibers. The effect of the reaction parameters, including the temperature, pH, HP and chitosan dosage, reaction time and pulp suspension consistency on the strength and hydrophobicity was investigated. pH value was found as the most remarkable factor influencing the sizing degree and gave a highest sizing value (506.2 s) at pH 5.5. The strength performance presented an opposite trend against the hydrophobicity, since the number of formed hydrogen bonds is the least when the hydrophobicity is the best. This work is extremely significant for providing valuable reference on improving the hydrophobicity and strength performance of papers through a green and biological way.

Graphic abstract

中文翻译：

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漆酶介导的苯酚/壳聚糖处理可改善牛皮纸浆的疏水性

摘要

在本文中，应用了由漆酶引发的巨大潜力的方法来将生物聚合物（壳聚糖和酚）接枝到未漂白的牛皮纸浆纤维上，以增强疏水性和强度。结果表明，壳聚糖和漆酶/酚类物质对KP浆粕纤维的疏水性显着改善具有协同作用。与原纸相比，采用漆酶/ 4-己氧基苯酚/壳聚糖（Lac / HP / CTS）系统处理纤维时，可获得较高的上浆度值（227.08 s）。相应的KP纤维的保水值从176.8％降低到171.3％，处理过的纤维的Kappa值从26.8增加到29.3，证实了HP成功接枝到纤维上。反应参数的影响，包括温度，pH，HP和壳聚糖的用量，研究了反应时间和纸浆悬浮液浓度对强度和疏水性的影响。发现pH值是影响施胶程度的最显着因素，在pH 5.5时，施胶值最高（506.2 s）。强度性能呈现出与疏水性相反的趋势，因为当疏水性最佳时，形成的氢键数量最少。这项工作对于通过绿色和生物方法改善纸张的疏水性和强度性能提供了有价值的参考。强度性能呈现出与疏水性相反的趋势，因为当疏水性最佳时，形成的氢键数量最少。这项工作对于通过绿色和生物方法改善纸张的疏水性和强度性能提供了有价值的参考。强度性能呈现出与疏水性相反的趋势，因为当疏水性最佳时，形成的氢键数量最少。这项工作对于通过绿色和生物方法改善纸张的疏水性和强度性能提供了有价值的参考。

图形摘要