Enhanced mechanical property and flame resistance of phosphorylated cellulose nanofiber based‐aerogel combined with boric acid

• DOI: 10.1002/app.56151
• Publication Date: 2024-08-16T13:08:11Z
• Authors: Jia‐Lin Zhou; Yu‐Qin Yang; Shuai Wang; Shanshan Zhang; Baiyu Jiang; Qian Li; Qiang Wu; Shi‐Neng Li
• Keywords: Boric acid

Abstract As for cellulose‐based aerogels, a feature of inadequate mechanics and easy‐flammability seriously restricts their practical applications. To address this issue, herein lightweight, mechanical elastic flame‐retardant phosphorylated lignin‐based cellulose nanofiber (PLCNF‐B) aerogel with the aid boric acid was successfully obtained by freeze‐drying method. Due to uniform tough network structure benefitting strong hydrogen bond between fibers acid, resultant showed excellent performance, that is, high compressive strength 8.9 kPa (strain: 50%) outstanding cyclic reliability (remain 90% after 10 cycles). Meanwhile, PLCNF‐B possesses highly improved property, LOI value (up 46%), significantly reduced peak heat release rate (11.2 W/g) total (0.47 kJ/g). Based on structural observation analysis, behavior should be attributed formation PxOy/amorphous boron oxide protective layer, which is derived from phosphorus containing group PLCNF acid. The splendid overall performance material offers potential tactic design development advanced bio‐based aerogels