Continuous Bacterial Cellulose Aerogel Fibers with High Strength

Jun-yan Zhang; Si Meng; Wen-ping Chen; Yan-hua Cheng; Mei-fang Zhu

doi:10.11777/j.issn1000-3304.2020.20143

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Continuous Bacterial Cellulose Aerogel Fibers with High Strength

Research Article | 更新时间：2021-05-15

- Continuous Bacterial Cellulose Aerogel Fibers with High Strength
- Acta Polymerica Sinica Vol. 52, Issue 1, Pages: 69-77(2021)
- 作者机构：
  
  纤维材料改性国家重点实验室东华大学材料科学与工程学院　上海 201620
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2020.20143
  CLC：
- Published：3 January 2021，
  
  Published Online：28 July 2020，
  
  Received：1 June 2020，
  
  Revised：21 June 2020，
扫描看全文
Jun-yan Zhang, Si Meng, Wen-ping Chen, Yan-hua Cheng, Mei-fang Zhu. Continuous Bacterial Cellulose Aerogel Fibers with High Strength. [J]. Acta Polymerica Sinica 52(1):69-77(2021)
DOI：

Jun-yan Zhang, Si Meng, Wen-ping Chen, Yan-hua Cheng, Mei-fang Zhu. Continuous Bacterial Cellulose Aerogel Fibers with High Strength. [J]. Acta Polymerica Sinica 52(1):69-77(2021) DOI： 10.11777/j.issn1000-3304.2020.20143.

摘要

气凝胶纤维因其高外表面积和高柔韧性在能量管理系统中具有潜在应用而引起了广泛关注. 但是，目前制备的气凝胶纤维力学强度较低，限制了其实际应用. 为提高气凝胶纤维力学性能，在始终保持细菌纤维素(BC)纳米纤维处于湿态下，利用NaOH/尿素/硫脲复合溶剂直接低温溶解原生BC，获得透明的BC纺丝原液；通过湿法纺丝制备了BC水凝胶纤维，经过水洗和冷冻干燥后处理，制得BC气凝胶纤维. 采用偏光显微镜(POM)、

C核磁共振(

C-NMR)和高级旋转流变仪研究BC在复合溶剂中的溶解过程与状态；利用全反射傅里叶变换红外吸收光谱(ATR-FTIR)、X射线衍射(XRD)和热失重(TG)研究BC溶解前后结构与性能变化；利用场发射扫描电镜(FESEM)、全自动比表面积和孔径分布分析仪、单丝强力仪对获得的BC气凝胶纤维结构与性能进行表征. 结果表明，复合溶剂在−15 °C条件下可以直接溶解原生湿态BC，最高溶解浓度为3 wt%；采用湿法纺丝制得高度多孔的连续BC气凝胶纤维，比表面积高达192 m

/g且具有优异的力学性能，断裂强度和杨氏模量高达(9.36±1.68) MPa和(176±17.55) MPa，如0.4 mg BC气凝胶纤维可以支撑高于其本身质量5×10

倍的重物.

Abstract

Aerogel fibers have attracted increasing interests due to their high outside specific surface area and high flexibility for applications in energy management systems. However

aerogel fibers usually suffer from weak mechanical properties and complicated fabrication process

thus severely restricting their broad application. In this paper

the never-dried bacterial cellulose (BC) with high molecular weight was firstly dissolved in NaOH/urea/thiourea aqueous solution at −15 °C. Followed by wet spinning

solvent exchange and freeze-drying

the BC aerogel fiber with high mechanical properties was simply obtained. The dissolution process was observed by polarized optical microscope (POM)

C nuclear magnetic resonance (NMR) and viscoelastic measurements. The variations of structure and properties on original BC and regenerated BC aerogel fibers were characterized by attenuated total reﬂection-Fourier transform infrared spectrometry (ATR-FTIR)

X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The structure and properties of BC aerogel fiber were studied by field emission scanning electron microscopy (FESEM)

specific surface area and pore size distribution analyzer (BET) and fiber strength tester. The results show that the never-dried BC can be dissolved in NaOH/urea/thiourea solution at low temperature. The maximum concentration of BC in the solution reaches up to 3 wt%. The resulted BC solution behaves as pseudoplastic fluid and stays stabe at room temperature. To fabricate BC aerogel fibers

wet-spinning technology and freeze-drying were utilized using BC solution as spinning dope. After regeneration

the crystal structure of BC transforms from I to II without derivatization. Meanwhile

highly porous structure in axial alignment with a high specific area of 192 m

/g was demonstrated in the BC aerogel fibers. Due to the high molecular weight of BC

strong intramolecular and intermolecular interactions

and molecular chain orientation

the tensile strength and Young’s modulus of BC aerogel fibers could reach up to (9.36±1.68) MPa and (176±17.55) MPa

which are higher than those of state-of-the-art aerogel fibers. The lightweight BC aerogel fiber can withstand a load of more than 5×10

times its own weight. Such BC aerogel fibers show high potentials in flexible biological scaffolds

drug carriers

bio-adsorbents and advanced thermal insulation textiles.

关键词

气凝胶纤维细菌纤维素低温溶解力学性能

Keywords

Aerogel fiberBacterial celluloseLow temperature dissolutionMechanical properties

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College of Materials Science and Engineering, Qingdao University

Department of Polymer Science and Engineering, Zhejiang University

School of Materials and Chemical Engineering, Xi'an Technological University

College of Bioresource Chemical and Materials Engineering, Shaanxi University of Science &Technology

State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University

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