电场辅助制备具有增强介电常数和各向异性光学性能的 PANI/TPU 全有机复合材料,Polymer Engineering and Science

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电场辅助制备具有增强介电常数和各向异性光学性能的 PANI/TPU 全有机复合材料
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2022-09-26 , DOI: 10.1002/pen.26156
Weifei Wu ₁ , Tianli Ren ₂ , Xueqing Liu ₃ , Kai Huai ₁ , Xin Cui ₁ , Huaixiao Wei ₁ , Jinjin Hu ₁ , Yuming Xia ₄ , Shuohan Huang ₄ , Kun (Kelvin) Fu ₅ , Jianming Zhang ₁ , Yuwei Chen ₁

Affiliation

为了满足多功能应用的需求，开发具有优异性能（如高介电常数、良好的机械性能和各向异性透光率）的功能复合材料迫在眉睫。在这方面，用全有机成分制备复合材料是一种很有前途的策略。在此，我们展示了一种通过交流电场在 TPU 基体中组装和排列聚苯胺 (PANI) 颗粒的简单且省时的方法。聚苯胺在聚合物基体中的排列不仅明显提高了介电常数，而且有效地增加了光学各向异性。在相同的填料含量下，在 10 Hz 电场下制备的定向复合材料的介电常数为 10.63 (10 ^-1 Hz)，高于随机复合材料的介电性能 (8.58)。在施加交流电场的情况下，通过原位光学显微镜系统地研究了 PANI 粒子排列过程的动力学。我们相信，这项研究工作提供了一种潜在的解决方案，可以通过电场排列有机填料来增加复合材料的介电常数和光学各向异性，这对于未来的柔性可穿戴电子产品至关重要。

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Electric field-assisted preparation of PANI/TPU all-organic composites with enhanced dielectric permittivity and anisotropic optical properties

To meet the demands of multifunctional applications, developing functional composites with excellent properties (such as high dielectric permittivity, good mechanical properties, and anisotropic optical transmittance) is urgent. In this regard, preparing composites with all-organic components is a promising strategy. Herein, we demonstrated a simple and time-saving method for assembling and aligning polyaniline (PANI) particles in the TPU matrix by an AC electric field. The alignment of PANI in the polymer matrix not only obviously enhances dielectric permittivity but also effectively increases optical anisotropy. At the same filler loading content, the dielectric permittivity of aligned composites prepared under 10 Hz electric fields is 10.63 (10⁻¹ Hz), which is higher than the dielectric property of random composites (8.58). The kinetics of aligning process of PANI particles are systematically studied by in situ optical microscope while an AC electric field is applied. We believe that this research work provides a potential solution to increase both dielectric permittivity and optical anisotropy of composites by the alignment of organic fillers via an electric field, which is essential for future flexible wearable electronics.

更新日期：2022-09-26

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