Tailoring Electrical and Mechanical Properties of All-Natural Polymer Composites for Environmentally Friendlier Electronics,ACS Applied Polymer Materials

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Tailoring Electrical and Mechanical Properties of All-Natural Polymer Composites for Environmentally Friendlier Electronics
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-02-24 , DOI: 10.1021/acsapm.9b01098
Mikel Rincón-Iglesias ₁ , Erlantz Lizundia _{1,

2} , Carlos M. Costa _{3,

4} , Senentxu Lanceros-Méndez _{1,

5}

Affiliation

Here we report the effect of cellulose nanocrystal (CNC) addition on the structural, mechanical, and dielectric properties of ι-carrageenan nanocomposites. Free-standing nanocomposites with a CNC concentration up to 20 wt % were fabricated using solely water as a solvent by doctor-blade casting followed by room-temperature drying. CNC incorporation does not modify the structural and morphological features of neat ι-carrageenan films. Uniaxial tensile testing shows a marked increase in the Young’s modulus from 231 ± 24 MPa for neat ι-carrageenan to 1725 ± 50 MPa for the 5 wt % counterpart with no remarkable loss in ductility. Such an increase, which remains well above the theoretical prediction obtained from modified Halpin–Tsai equations, together with morphological observations, indicates that CNCs are homogeneously dispersed within the matrix, as well as the presence of a strong ι-carrageenan-CNC interface. Finally, it is observed that CNC incorporation enhances the real dielectric constant ε′ and the AC conductivity values thanks to the additional ι-carrageenan-CNC interfacial contributions to the dielectric response. Overall, the experimental results shown here provide approaches for the improvement of the mechanical and dielectric properties of polysaccharides from marine origin to increase their range of applications.

中文翻译：

量身定制用于环保电子产品的全天然聚合物复合材料的电气和机械性能

在这里，我们报道了纤维素纳米晶体（CNC）的添加对α-角叉菜胶纳米复合材料的结构，机械和介电性能的影响。仅使用水作为溶剂通过刮刀浇铸，然后在室温下干燥，制造了CNC浓度最高为20 wt％的自支撑纳米复合材料。CNC结合不改变纯的α-角叉菜胶膜的结构和形态特征。单轴拉伸试验表明，杨氏模量从纯的α-角叉菜胶的231±24 MPa显着增加到5 wt％的对应物的1725±50 MPa，而延展性没有明显降低。这样的增加仍然远远超过从修改过的Halpin-Tsai方程获得的理论预测以及形态学观察结果，表明CNCs均匀地分散在基质中，以及强的α-角叉菜胶-CNC界面的存在。最后，观察到由于附加的1-角叉菜胶-CNC对介电响应的贡献，CNC掺入提高了实际介电常数ε'和AC电导率值。总体而言，此处显示的实验结果为改善海洋来源多糖的机械和介电性能提供了方法，以增加其应用范围。

更新日期：2020-02-24

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