漂白竹浆板制备纳米纤维素晶体及其表征

Preparation and Characterization of Cellulose Nanocrystals from Bleached Bamboo Pulp Sheet

中文关键词:  纳米纤维素晶体（NCC）  竹浆板  超声波

Key Words:cellulose nanocrystals （NCC）  bamboo pulp board  ultrasound

中文摘要:

      以漂白混合竹浆板为原料，采用碱预处理竹浆后，再采用磁力搅拌辅助硫酸水解并结合超声波的方法制备纳米纤维素晶体（NCC），竹浆∶硫酸为1∶31（固液比），探讨硫酸浓度、硫酸水解时间和反应温度对竹浆NCC制备的影响；并利用扫描电子显微镜（SEM）、原子力显微镜（AFM）、X射线衍射仪（XRD）和热重分析仪（TGA）对制得的竹浆NCC进行表征。结果表明，磁力搅拌辅助硫酸水解并结合超声波方法制备竹浆NCC的最佳工艺条件为：硫酸浓度65%、反应温度45℃、处理时间45 min，该条件下制得的竹浆NCC粒径小且分布均匀，其结晶结构具有从纤维素Ⅱ型转变成纤维素IV_Ⅱ型的趋势；与竹浆纤维素相比，竹浆NCC吸水能力增强，可及度增加，热稳定性提高。

Abstract:

      In order to obtain cellulose nanocrystals （NCC）， bamboo pulp was treated with sulfuric acid assisted by magnetic stirring and ultrasonic wave after alkali pretreatment. The solid-liquid ratio of bamboo pulp to sulfuric acid was 1∶31. Effects of sulfuric acid concentration， sulfuric acid assisted with magnetic stirring treatment time and reaction temperature on NCC were discussed. And the properties of NCC were characterized by SEM， AFM， XRD and TGA. The results showed that the particle size of NCC was small and the distribution of NCC was uniform， and the crystal structure of NCC was changed from cellulose II to cellulose IV_II when the optimum preparation condition of NCC was concentration of sulfuric acid of 65%， the reaction temperature of 45℃ and the treatment time of 45 min. Compared with bamboo cellulose， the adsorption capacity， accessibility， and thermostability of NCC were improved.