阔叶木浆高锰酸钾氧化制备纤维素纳米纤维

Preparation of Cellulose Nanofibrils by Oxidation of Potassium Permanganate from Hardwood Pulp

中文关键词:  漂白硫酸盐阔叶木浆（BHKP）  高锰酸钾氧化  纤维素纳米纤维

Key Words:bleached hardwood kraft pulp （BHKP）  oxidation of potassium permanganate  cellulose nanofibers

中文摘要:

      本研究以漂白阔叶木浆为原料，通过KMnO₄氧化预处理，结合低能耗高压均质处理，成功制备了羧基化纤维素纳米纤维，并探究氧化时间对羧基化纤维素纳米纤维的形貌尺寸、得率、化学结构、Zeta电位、结晶度等参数的影响。研究结果表明，氧化反应1 h制备的羧基化纤维素纳米纤维得率高达97.3%，长径比375 nm，Zeta电位-22.5 mV，初始热分解温度高于293.2 ℃，具有良好的分散稳定性和热稳定性。通过真空抽滤制备的羧基化纤维素纳米纤维薄膜具有优异的机械性能（拉伸强度最高为85.49 MPa）和高透光率（最高为88.1%）。

Abstract:

      In this study， carboxylated cellulose nanofibers were successfully prepared by KMnO₄ oxidation pretreatment combined with low-energy and high-pressure homogenization using bleached hardwood pulp as raw material. The effects of oxidation time on the morphology， size， yield， chemical structure， Zeta potential， crystallinity， and other parameters of carboxylated cellulose nanofibers were explored. The results showed that the yield of carboxylated cellulose nanofibers with aspect ratio of 375 nm prepared by oxidation reaction for 1 h was as high as to 97.3%， and Zeta potential was -22.5 mV. The initial thermal decomposition temperature was higher than 293.2 ℃， and it had good dispersion stability and thermal stability. The thin film of carboxylated cellolose nanofibers prepared by vacuum filtration had excellent mechanical properties （maximum tensile strength was 85.49 MPa） and high light transmittance （up to 88.1%）.