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

作　　者：Yu He Yuanya Zhang Yongjun Zhou Junya Yuan Xuehu Men 

机构地区：[1]School of Materials and Energy,Lanzhou University,Lanzhou,730000,PR China [2]State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou,730000,PR China [3]Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai,Yantai,265503,PR China [4]National United Engineering Laboratory for Advanced Bearing Tribology,Henan University of Science and Technology,Luoyang,471023,PR China

出　　处：《Nano Materials Science》2024年第6期752-763,共12页纳米材料科学(英文版)

基　　金：supported by the Open Project of Basic Research of Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai(Grant No.AMGM2023F08);Open Fund Project of National United Engineering Laboratory for Advanced Bearing Tribology(No.202301).

摘　　要：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),onedimensional 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.

关 键 词：BNNSs-AgNPs Hybrid aerogel Polymer-based composites Thermal conduction pathways Tribological properties 

分 类 号：TB3[一般工业技术—材料科学与工程]