Cellulose nanocomposites with nanofibres isolated from pineapple leaf fibers for medical applications
Cellulose nanocomposites with nanofibres isolated from pineapple leaf fibers for medical applications
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DOI：
10.1016/j.carbpol.2011.07.009
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发表时间：
2011-10-15
影响因子：
11.2
通讯作者：
Thomas, Sabu
中科院分区：
文献类型：
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作者：
Cherian, Bibin Mathew;Leao, Alcides Lopes;Thomas, Sabu
纳米纤维素是从可再生纤维素来源获得的结晶域，用于提高聚合物复合材料的机械性能和生物降解性。本工作主要是研究高压去纤和化学净化对PALF纤维形态从微米级到纳米级的影响。利用显微镜和X射线衍射技术研究了所制备的纳米纤维和复合材料的结构和性能。显微镜研究表明，所使用的个性化过程导致PALF纤维的互联网状结构的独特形态。所产生的纳米纤维是纤维素纤维束，其宽度在5和15 nm之间，估计长度为几微米。与其他常规方法相比，发现通过该技术获得的纳米管的产率和纵横比非常高。纳米复合材料是通过压缩成型的方式制备的，通过将纳米纤维素纤维垫堆叠在聚氨酯膜之间。结果表明，纳米纤维能有效地增强聚氨酯。添加5重量%的纤维素纳米原纤到PU的强度增加了近300%，刚度增加了2600%。开发的复合材料被用来制造各种通用的医疗植入物。(C)2011爱思唯尔有限公司保留所有权利。
Nanocellulose is the crystalline domains obtained from renewable cellulosic sources, used to increase mechanical properties and biodegrability in polymer composites. This work has been to study how high pressure defibrillation and chemical purification affect the PALF fibre morphology from micro to nanoscale. Microscopy techniques and X-ray diffraction were used to study the structure and properties of the prepared nanofibers and composites. Microscopy studies showed that the used individualization processes lead to a unique morphology of interconnected web-like structure of PALF fibers. The produced nanofibers were bundles of cellulose fibers of widths ranging between 5 and 15 nm and estimated lengths of several micrometers. Percentage yield and aspect ratio of the nanofiber obtained by this technique is found to be very high in comparison with other conventional methods. The nanocomposites were prepared by means of compression moulding, by stacking the nanocellulose fibre mats between polyurethane films. The results showed that the nanofibrils reinforced the polyurethane efficiently. The addition of 5 wt% of cellulose nanofibrils to PU increased the strength nearly 300% and the stiffness by 2600%. The developed composites were utilized to fabricate various versatile medical implants. (C) 2011 Elsevier Ltd. All rights reserved.