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    Linear and crosslinked polyimide aerogels: synthesis and characterization

    Year: 2019

    Journal: J. Mater. Res. Technol-JMRT, Volume 8, MAY-JUN, page 2638–2648

    Authors: Simon-Herrero, Carolina; Chen, Xiao-Yuan; Luz Ortiz, Maria; Romero, Amaya; Valverde, Jose L.; Sanchez-Silva, Luz

    Organizations: European Union's Horizon 2020 research and innovation program [646397]

    Keywords: Freeze-drying; Polyimide; Sound absorption coefficient; High thermal stability

    Linear and crosslinked polyimide aerogels have been synthesized by means of a simple and eco-friendly process. Water-soluble poly(amic acid), PAA, solution was produced and thermal imidization was employed. Furthermore, freeze drying was used. In the present work, the influence of the solid content of the PAA solution and the crosslinking addition on the properties of the resulted aerogels were evaluated. An increase in solid content resulted in denser structures. Thermogravimetric analysis demonstrated thermal stability of polyimide aerogels up to 550 degrees C. Moreover, the crosslinking addition resulted in mechanical properties improvements. In addition, the obtained polyimide aerogels retained an oil amount of 14 times higher than its dry weight. Besides, polyimide aerogels showed very good values of sound absorption coefficient (maximum value of 0.91) and low thermal conductivities (0.038-0.045 W/m K). Summarizing, PI aerogels presented very good thermal and acoustic insulation properties, excellent thermal stability and good oil sorption capability. (C) 2019 The Authors. Published by Elsevier B.V.
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