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Controlled mercerization of bacterial cellulose provides tunability of modulus and ductility over two orders of magnitude.
Journal of the Mechanical Behavior of Biomedical Materials ( IF 3.9 ) Pub Date : 2018-11-06 , DOI: 10.1016/j.jmbbm.2018.11.005
Mousa Younesi 1 , Xinyu Wu 1 , Ozan Akkus 2
Affiliation  

Effects of mercerization process on plant-based cellulose is well studied in the literature whereas the effects of mercerization on mechanical properties of bacterial cellulose is not investigated. In this work bacterial cellulose (BC) was mercerized in NaOH solution with different molar concentrations of 0, 1.50, 1.75, 2.00, 2.13, 2.25, 5.00, 7.00 and 10.00 M. The BC samples shrunk substantially with increasing NaOH concentration. At the same concentration, NaOH treatment resulted in significantly larger shrinkage than KOH treatment. Mercerization of BC samples in 7 M NaOH resulted in an order of magnitude increase in elongation from 5.4 ± 1.6% to 50.8 ± 5.7% along with about 30-fold reduction in Young's modulus. Mercerized samples in 4 M NaOH had maximum toughness among all groups at a value of 64.0 ± 15.8 MJ m−3. Changes in BC crystalline structure from cellulose I to cellulose II were characterized and confirmed semiquantitatively by using X-ray diffraction (XRD) and Raman spectroscopy. Results of this work demonstrated mercerization as a method to tune the mechanical properties of BC precisely. Mercerized BC as a biocompatible material with tunable mechanical properties shows potential to be utilized in tissue engineering and regenerative medicine in the future.



中文翻译:

细菌纤维素的受控丝光作用可提供超过两个数量级的模量和延展性可调性。

丝光化过程对植物基纤维素的影响已在文献中进行了充分的研究,而丝光化对细菌纤维素的机械性能的影响尚未得到研究。在这项工作中,细菌纤维素(BC)在NaOH溶液中丝光,其摩尔浓度分别为0、1.50、1.75、2.00、2.13、2.25、5.00、7.00和10.00M。BC样品随着NaOH浓度的增加而显着收缩。在相同的浓度下,NaOH处理比KOH处理产生明显更大的收缩率。BC样品在7 M NaOH中的光化导致伸长率从5.4±1.6%到50.8±5.7%数量级增加,同时杨氏模量降低了约30倍。在所有组中,在4 M NaOH中进行丝光处理的样品均具有最大的韧性,值为64.0±15.8 MJ m -3。表征了从纤维素I到纤维素II的BC晶体结构的变化,并通过X射线衍射(XRD)和拉曼光谱法进行了半定量证实。这项工作的结果表明丝光处理是一种精确调整BC机械性能的方法。丝光化的BC作为具有可调节机械性能的生物相容性材料,显示了将来在组织工程和再生医学中使用的潜力。

更新日期:2018-11-06
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