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1.青岛大学材料科学与工程学院 环境科学与工程学院 纤维与现代纺织国家重点实验室 青岛 266071
2.中国林业科学研究院木材工业研究所 北京 100091
Published:20 April 2017,
Received:15 June 2016,
Revised:18 July 2016,
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Gui-chao Ye, Yun Lu, Ya-fang Yin, Dong-jiang Yang, Jin Sun, Xi-lin She, Yan-zhi Xia. High Frequency Ultrasound Preparation of TEMPO-oxided Ultrafine Cellulose Nanofibrils of Angstrom-scale. [J]. Acta Polymerica Sinica (4):683-691(2017)
Gui-chao Ye, Yun Lu, Ya-fang Yin, Dong-jiang Yang, Jin Sun, Xi-lin She, Yan-zhi Xia. High Frequency Ultrasound Preparation of TEMPO-oxided Ultrafine Cellulose Nanofibrils of Angstrom-scale. [J]. Acta Polymerica Sinica (4):683-691(2017) DOI: 10.11777/j.issn1000-3304.2017.16200.
通过不同TEMPO氧化体系对商品竹浆进行氧化处理,经高频超声纳米纤丝化后,可以制得长度在数百纳米,宽度小于5.0 nm,厚度仅为几个埃的纤维素纳米纤丝(TEMPO-oxided cellulose nanofibrils,TOCNs).这种纳米带状(nanostrip)的TOCNs是由纤维素片层构成的.本文通过场发射扫描电子显微镜(FE-SEM)探究了原料和2组TOCNs样品的形貌变化,利用透射电子显微镜(TEM)和原子力显微镜(AFM)对2组TOCNs样品的三维尺寸(长、宽、厚)进行测量统计.通过不同氧化体系产物的TOCNs三维尺寸差异,并结合傅里叶红外吸收光谱(FTIR)、X射线衍射(XRD)及交叉极化和魔角旋转
13
C固态核磁共振光谱(CP/MAS
13
C-NMR)揭示了不同氧化体系对纤维素I
β
层内氢键及长轴方向的作用机理.
The commercial bleached bamboo was oxidized to TEMPO-oxidized cellulose nanofibrils (TOCNs) with hundreds of nanometers in length
less than 5 nm in width and the thickness less than 1 nm
which was done through TEMPO (2
2
6
6-tetramethylpiperidine-1-oxyl radical)-mediated oxidation and successive mild disintegration in water solution combined with high frequency ultrasonic treatment. The shape and dimensions of these sheets (termed "nanoribbons" hereafter)
composed of many mono-and multi-layered molecular sheets
were analyzed by scattering and spectroscopy techniques to understand the structural changes. The morphology of the raw material and two types of TOCNs nanoribbons were characterized by field emission scanning electron microscope (FESEM). And the three-dimensional morphologies of the same two TOCNs samples were measured through transmission electron microscope (TEM) and atomic force microscope (AFM). The results revealed that the TEMPO-mediated oxidization systems processed in cellulose I
β
intra-layer hydrogen bonds and the long axis direction of elementary fibrils (composed by 36 cellulose chains)
which was explained based on the three dimensional size difference and the change of the crystalline structure in TOCNs nanoribbons. The structures of different nanoribbons were analyzed by Fourier infrared absorption spectrum (FTIR)
X-ray diffraction (XRD) and cross polarization and magic angle spinning solid-state
13
C nuclear magnetic resonance (CP/MAS
13
C-NMR). FTIR analysis indicated that structure of the cellulose nanofibrils was changed during oxidization
significant amount of C6 carboxylate groups were selectively formed on each cellulose nanofibril surface by TEMPO-mediated oxidation without any changes to the original crystalline structure. XRD analysis indicated that the cellulose elementary fibrils were broken mainly along its (101) planes in TEMPO/NaClO/NaClO
2
and TEMPO/NaClO/NaBr oxidized systems under high frequency ultrosonic treatment
while the I
β
crystalline structure was retained. CP/MAS
13
C-NMR results were in accordance with the analyses from XRD and Raman spectra. Moreover
the oxidization scheme was important to explain the structures of the final products. This research has important significance for design
development and application of ultrafine biomass cellulose nanoribbons.
TEMPO氧化高频超声纤维素纳米纤丝三维尺寸氧化机理
TEMPO-oxidizationHigh frequency ultrasonicationCellulose nanofibrilsThree dimensional sizeOxidation mechanism
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