Linear and crosslinked polyimide aerogels: synthesis and characterization

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...

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Bibliographic Details
Published in:Journal of materials research and technology 2019-05, Vol.8 (3), p.2638-2648
Main Authors: Simón-Herrero, Carolina, Chen, Xiao-Yuan, Ortiz, Maria Luz, Romero, Amaya, Valverde, José L., Sánchez-Silva, Luz
Format: Article
Language:English
Subjects:
Freeze-drying
High thermal stability
Polyimide
Sound absorption coefficient
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Summary: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°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 (0.038–0.045W/mK). Summarizing, PI aerogels presented very good thermal and acoustic insulation properties, excellent thermal stability and good oil sorption capability.
ISSN:2238-7854
DOI:10.1016/j.jmrt.2019.02.016