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Quantitative Evaluation of the Hierarchical Porosity in Polyimide Aerogels and Corresponding Solvated Gels.
Rinehart, Samantha J; Nguyen, Baochau N; Viggiano, Rocco P; Meador, Mary Ann B; Dadmun, Mark D.
Afiliación
  • Rinehart SJ; Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States.
  • Nguyen BN; Ohio Aerospace Institute, 22800 Cedar Point Road, Cleveland, Ohio 44135, United States.
  • Viggiano RP; NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, Ohio 44135, United States.
  • Meador MAB; NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, Ohio 44135, United States.
  • Dadmun MD; Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States.
ACS Appl Mater Interfaces ; 12(27): 30457-30465, 2020 Jul 08.
Article en En | MEDLINE | ID: mdl-32538072
Aerogels are promising materials for many aerospace applications, including high-performance antennae and flexible insulation, because of their inherent low density and high surface areas. Polymer aerogels, especially polyimide aerogels, provide excellent mechanical properties beyond traditional silica aerogels while maintaining the required thermal stability. Polyimide aerogel surface area, porosity, and pore volume are important properties; however, these measurements are traditionally conducted on the aerogel after removal of the solvent. Because of this, the impact of synthetic control and solvent presence on the nanoscale to mesoscale structure of polyimide aerogels in functional applications is unclear. In this report, we use small-angle neutron scattering to determine the dry and solvated skeletal strut size and composition of polyimide aerogels to deduce the impact of solvation on the structure of complex aerogel struts. Our results show that the aerogel contains a hierarchical assembly of pores, with pores present both within and between the supporting struts. This translates to a material with solvent in the larger pores, as well as absorbed in the supporting polyimide skeleton. The amount of solvent uptake in the struts varies with the solvent and polyimide properties. The insight from these results provides pathways to determine the correlations between aerogel nano- and mesoscale structural characteristics, fabrication processes, and their performance in functional applications such as polymeric battery separators. These results also broaden the characterization tools of polymeric aerogels that differentiate between dry and solvated nano- and mesoscale structures that exist in common operating conditions.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: ACS Appl Mater Interfaces Asunto de la revista: BIOTECNOLOGIA / ENGENHARIA BIOMEDICA Año: 2020 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: ACS Appl Mater Interfaces Asunto de la revista: BIOTECNOLOGIA / ENGENHARIA BIOMEDICA Año: 2020 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos