The Influence of Pristine and Aminoacetic Acid-Treated Aluminum Nitride on the Structure, Curing Processes, and Properties of Epoxy Nanocomposites

IF 3 Q2 MATERIALS SCIENCE, COMPOSITES

Journal of Composites Science Pub Date : 2023-11-21 DOI:10.3390/jcs7120482

A. Bekeshev, A. Mostovoy, Andrey Shcherbakov, L. Tastanova, Marzhan Akhmetova, Ainagul Apendina, Raigul Orynbassar, M. Lopukhova

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Abstract

This article describes the preparation of aluminum nitride (AlN) functionalized with amino groups by chemically modifying the surface of AlN with aminoacetic acid and their dispersion in the epoxy composition. As a result of the studies, it was found that the functionalization of AlN particles with aminoacetic acid ensured their better chemical compatibility with the epoxy composition, which facilitated the dispersibility of AlN particles; it was also found that the functionalization of the nanofiller has a significant effect on the structure, curing kinetics, physicochemical and mechanical properties of epoxy nanocomposites. The optimal concentration of the functionalizing agent (aminoacetic acid) has been determined, which is necessary for the chemical binding of the functional groups of aminoacetic acid, the epoxy oligomer and AlN, which best affects the dispersion and the size distribution of AlN particles, and also ensures maximum strength characteristics of epoxy composites containing AlN treated with aminoacetic acid: bending stress and bending modulus increase by 35% and 80%, respectively, while tensile strength and tensile elastic modulus increase by 74% and 36%, respectively. Furthermore, the impact strength shows a remarkable boost of 133% compared to plasticized epoxy composite without AlN.

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原始氮化铝和经氨基乙酸处理的氮化铝对环氧纳米复合材料的结构、固化过程和性能的影响

本文介绍了通过用氨基乙酸对氮化铝表面进行化学修饰，制备出具有氨基基团功能的氮化铝（AlN），并将其分散在环氧树脂组合物中。研究结果发现，用氨基乙酸对 AlN 颗粒进行官能化处理可确保其与环氧组合物具有更好的化学相容性，从而促进 AlN 颗粒的分散性；研究还发现，纳米填料的官能化对环氧纳米复合材料的结构、固化动力学、物理化学和机械性能具有显著影响。研究确定了官能化剂（氨基乙酸）的最佳浓度，该浓度是氨基乙酸、环氧低聚物和 AlN 的官能团化学结合所必需的，能最好地影响 AlN 颗粒的分散和尺寸分布，还能确保含有经氨基乙酸处理的 AlN 的环氧复合材料具有最大的强度特性：弯曲应力和弯曲模量分别增加了 35% 和 80%，拉伸强度和拉伸弹性模量分别增加了 74% 和 36%。此外，与不含 AlN 的塑化环氧复合材料相比，冲击强度显著提高了 133%。

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