差异预处理对竹浆纤维分散性能的影响行为研究

Effects of Different Pretreatment on the Dispersibility of Bamboo Pulp Fibers Suspensions

中文关键词:  竹浆纤维  分散性  预处理  羧基  分散剂

Key Words:bamboo pulp fibers  dispersibility  pretreatment  carboxylate contents  dispersants

中文摘要:

      纸浆纤维的分散性能直接影响机械法均质制备纳米纤维素的效率。本研究分析了生物酶解预处理、TEMPO氧化预处理和PFI磨浆预处理对竹浆纤维分散性能的影响。通过表征预处理纤维的表面形态和表面电荷，探讨了引起竹浆纤维分散性能差异的原因。结果表明，TEMPO氧化预处理和PFI磨浆预处理的竹浆纤维分散性好，生物酶解预处理的竹浆纤维分散性差；PFI磨浆预处理的纤维表面分丝帚化好；TEMPO氧化预处理的纤维具有较高的羧基含量和Zeta电位绝对值；0.5% CMC分散剂可以显著提高生物酶解预处理纤维的分散性。

Abstract:

      Industrial production efficiency of nanocellulose by mechanical homogenization was directly affected by dispersibility of pulp suspensions. The bamboo pulp was pretreated by TEMPO， enzymatic hydrolysis and refining to study dispersibility of the pulp suspensions. Physical morphology and surface charges of the pretreated pulp fibers were analyzed to explain the differences of dispersibility. Multiple light scattering results showed that TEMPO oxidized pulp fibers and refined pulp fibers had good dispersivity， while the enzymatic pulp fibers had bad dispersivity. Fibrillation on the refined pulp fibers was observed by scanning electron microscope （SEM）. The TEMPO oxidized pulp fibers had high carboxylate contents and high absolute value of Zeta potential. The dispersibility of the fibers could be improved by dispersants， and the best dispersibility of enzymatic hydrolysis fibers was obtained with 0.5% CMC dispersant.