Interfacial layer thickness design for exploiting the reinforcement potential of nanocellulose in cellulose triacetate matrix
Interfacial layer thickness design for exploiting the reinforcement potential of nanocellulose in cellulose triacetate matrix
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DOI：
10.1016/j.compscitech.2017.05.010
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发表时间：
2017-07-28
影响因子：
9.1
通讯作者：
Isogai, Akira
中科院分区：
文献类型：
--
作者：
Soeta, Hiroto;Fujisawa, Shuji;Isogai, Akira
采用2,2,6,6 -四甲基哌替啶-1-氧（TEMPO）氧化纤维素纳米纤维（TOCN）和三醋酸纤维素（CTA）研究了界面层厚度对复合材料性能的影响。为了控制界面层厚度，通过接枝不同分子量的胺端聚乙二醇（PEG-NH2）对TOCNs表面进行修饰。将纯TOCNs或PEG接枝TOCNs与CTA复合，制备了不同界面层厚度的纳米复合膜。研究表明，较薄的界面层增强了纳米复合膜的刚度，而较厚的界面层增强了其延展性。即使添加TOCNs或接枝peg TOCNs，也能保持CTA膜的高透明度和低双折射率。虽然TOCN的加入抑制了纳米复合膜的热膨胀，但TOCN表面PEG层的存在对其热膨胀的抑制产生了负面影响。这些结果表明，界面层厚度对纳米纤维素增强复合材料的力学和热性能有重要影响。(C) 2017 Elsevier Ltd.版权所有。
The contribution of the interfacial layer thickness to composite properties was investigated using 2,2,6,6tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofiber (TOCN) and cellulose triacetate (CTA). To control the interfacial layer thickness, the surface of the TOCNs was modified by grafting amine terminated poly(ethylene glycol) (PEG-NH2) with different molecular weights. Neat TOCNs or PEG grafted TOCNs were compounded with CTA to prepare nanocomposite films with different interfacial layer thicknesses. We demonstrated that thinner interfacial layers enhanced the stiffness of the nano composite films, whereas thicker interfacial layers enhanced their ductility. The high transparency and low birefringence of the CTA films were preserved even with the addition of TOCNs or PEG-grafted TOCNs. Although the thermal expansion of the nanocomposite films was suppressed by TOCN addition, the presence of PEG layers on the TOCN surfaces had a negative impact on their restraint of the thermal expansion. These results suggest that the interfacial layer thickness plays an important role in the mechanical and thermal properties of nanocellulose-reinforced composites. (C) 2017 Elsevier Ltd. All rights reserved.