Construction of 3D aerogels consisting of cellulose and BNNSs bridged by AgNPs for enhancing thermal and tribological properties of polyurethane composites

Nano Materials Science Pub Date : 2024-02-26 DOI:10.1016/j.nanoms.2024.02.004

Yu He, Yuanya Zhang, Yongjun Zhou, Junya Yuan, Xuehu Men

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Abstract

Waterborne polyurethane (WPU) is attracting widespread attention in the friction field, but pure WPU cannot meet the wear resistance requirements due to poor thermal and self-lubricating properties. Herein, a novel cellulose/BNNSs-AgNPs aerogel (CBAg) composed of zero-dimensional silver nanoparticles (AgNPs), one-dimensional cellulose and two-dimensional boron nitride nanosheets (BNNSs) was successfully fabricated. Specifically, AgNPs were loaded onto the surface of BNNSs, which could serve as bridges to connect adjacent BNNSs. Cellulose was used to construct a 3D skeleton structure for stabilizing better dispersion of inorganic fillers. Finally, the thermal and tribological properties of CBAg-WPU were improved compared to pure WPU, with a 69% increase in thermal conductivity and an 89% reduction in wear rate. This was attributed to the load-bearing capacity of cellulose and outstanding thermal and lubricant capability of BNNSs-AgNPs. In addition, BNNSs and AgNPs inside the aerogel were transferred to the sliding interface and participated in the formation of high-quality friction transfer film, further endowing CBAg-WPU composites prominent tribological performance. Therefore, the novel design of 3D hybrid aerogels provided a promising avenue to improve the tribological performance of WPU composites.

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用 AgNPs 桥接纤维素和 BNNSs 构建三维气凝胶，提高聚氨酯复合材料的热性能和摩擦学性能

水性聚氨酯（WPU）在摩擦领域受到广泛关注，但由于热性能和自润滑性能较差，纯 WPU 无法满足耐磨性要求。本文成功制备了一种新型纤维素/BNNSs-AgNPs 气凝胶（CBAg），该气凝胶由零维银纳米粒子（AgNPs）、一维纤维素和二维氮化硼纳米片（BNNSs）组成。具体来说，AgNPs 被负载到 BNNSs 表面，可作为连接相邻 BNNSs 的桥梁。纤维素被用来构建三维骨架结构，以更好地稳定无机填料的分散。最后，与纯 WPU 相比，CBAg-WPU 的热性能和摩擦学性能得到了改善，热导率提高了 69%，磨损率降低了 89%。这归功于纤维素的承载能力和 BNNSs-AgNPs 出色的导热和润滑能力。此外，气凝胶中的 BNNSs 和 AgNPs 被转移到滑动界面，参与形成了高质量的摩擦传递膜，进一步赋予了 CBAg-WPU 复合材料突出的摩擦学性能。因此，三维混合气凝胶的新颖设计为改善WPU复合材料的摩擦学性能提供了一条很有前景的途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Nano Materials Science

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