Sustainable Bacterial Cellulose-Based Composite Aerogels with Excellent Flame Retardant and Heat Insulation

Author:

Wang Zhixin1,E YuYu1,Li Jie2,Du Tingting3,Wang Kun1,Yao Xi4,Jiang Jianxin1,Wang Meng5

Affiliation:

1. Beijing Forestry University

2. Chinese Academy of Sciences

3. Shandong University

4. International Centre for Bamboo and Rattan

5. China National Pulp and Paper Research Institute Co., Ltd.

Abstract

Abstract Bacterial cellulose (BC) aerogels with ultralight, low density, and low thermal conductivity are hopeful candidates for environmentally friendly heat insulating materials. However, the application of BC in packaging and building as a heat nonconductor is seriously limited by its flammable characteristics. Hence, we report a moderate approach to fabricating a flame retardant and heat-insulating composite aerogel by introducing zinc borate (ZB) particles into BC via an ultrasound-assistant deposition process. The in situ synthesis of ZB particles resulted in the separation of single fibers from fiber bundles in BC instead of damaging its homogeneous porous structure, improving its thermal stability by weakening the convective intensity of heat rays. The heat release capacity of the prepared composite aerogel was only 8 J·g− 1 k− 1, exhibiting excellent flame retardancy. The probable mechanism proposed to be that the dehydration of ZB particles lowered the surface temperature by releasing the bound water, and simultaneously produced metallic oxides (ZnO and B2O3) for retarding the spread of heat and isolating the flammable fibrils within the combustion area. Because of the natural substrate and simple process, the present approach has potential applications for industrial-scale production of green and flame retardant material.

Publisher

Research Square Platform LLC

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