Manufactory and Properties of Poly(p-Phenylenebenzobisoxazole) Aerogels Prepared by a Simple Freeze-Drying Procedure

Abstract:

Aerogels based on organic high performance fibers have been attracted great attention due to its excellent thermal and mechanical properties. Here, PBO nanofiber aerogel were prepared from the super-fiber PBO through a top-down process with a sol-gel process and a simple freeze-drying process, followed by thermal cross-linking. The prepared aerogel has a small volume shrinkage, a high specific surface area of 168.9 m² /g and a small pore diameter of 1.356 nm. Because of its 3D porous structure, it results in a low density of 6 to 30 mg/cm³ and a high porosity (98%). The aerogel retains the molecular structure of PBO at the same time, which gives it initial thermal decomposition temperature up to 500 °C and a superior fire-retardant capability. PBO aerogel possesses good compressive properties with a yield stress of 0.44MPa at 80% strain and an elasticity modulus of 1.98 MPa which is higher than SiO₂ and cellulose aerogel reported.

• Periodical: Materials Science Forum (Volume 993)
• Pages: 662-668
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.993.662
• Online since: May 2020
• Authors: Yu Nong Wei, Guang Li, Sheng Lin Yang, Jun Hong Jin*
• Keywords: Aerogel, High Decomposition Temperature, High Porosity, PBO Fiber

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