Synthesis of Nanofibrillated Cellulose by Combined Ammonium Persulphate Treatment with Ultrasound and Mechanical Processing.
Synthesis of Nanofibrillated Cellulose by Combined Ammonium Persulphate Treatment with Ultrasound and Mechanical Processing.
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DOI：
10.3390/nano8090640
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发表时间：
2018-08-21
期刊：
影响因子：
--
通讯作者：
Berzins A
中科院分区：
文献类型：
--
作者：
Filipova I;Fridrihsone V;Cabulis U;Berzins A
近年来，过硫酸铵一直被认为是一种制备纳米纤维素的试剂，但大多数研究都集中在制备纤维素纳米晶上。过硫酸铵氧化和普通机械处理相结合以获得纤维素纳米原纤维的研究已被发现。本研究的目的是研究过硫酸铵氧化结合超声波和机械处理制备的羧化纤维素纳米纤维。采用光学显微镜、原子力显微镜(AFM)、粉末X射线衍射仪(PXRD)、傅立叶变换红外光谱(FTIR)、热重分析(TGA)和Zeta电位测量等方法进行了研究。以漂白的桦木硫酸盐纸浆纤维为原料，采用过硫酸铵溶液进行化学前处理，然后在实验室高剪切混合机中进行机械处理和超声波处理，得到了不同组分的羧化纤维素悬浮液，包括纳米纤维、微纤维和束状纤维。所得纳米纤维的特征为：直径2 0~30 0 nm，结晶度74.3%，Zeta电位−2 6.9±1.8 mV，在1740 cm−1处有清晰的FTIR峰，表明C=O伸缩振动，热稳定性低于硫酸盐纸浆。该方法可用于制备具有特定结晶度的纤维素纳米纤维。
Ammonium persulfate has been known as an agent for obtaining nanocellulose in recent years, however most research has focused on producing cellulose nanocrystals. A lack of research about combined ammonium persulfate oxidation and common mechanical treatment in order to obtain cellulose nanofibrils has been identified. The objective of this research was to obtain and investigate carboxylated cellulose nanofibrils produced by ammonium persulfate oxidation combined with ultrasonic and mechanical treatment. Light microscopy, atomic force microscopy (AFM), powder X-Ray diffraction (PXRD), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and Zeta potential measurements were applied during this research. The carboxylated cellulose suspension of different fractions including nanofibrils, microfibrils and bundles were produced from bleached birch Kraft pulp fibers using chemical pretreatment with ammonium persulfate solution and further defibrillation using consequent mechanical treatment in a high shear laboratory mixer and ultrasonication. The characteristics of the obtained nanofibrils were: diameter 20–300 nm, crystallinity index 74.3%, Zeta potential −26.9 ± 1.8 mV, clear FTIR peak at 1740 cm−1 indicating the C=O stretching vibrations, and lower thermostability in comparison to the Kraft pulp was observed. The proposed method can be used to produce cellulose nanofibrils with defined crystallinity.
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