Title

One Pot Synthesis of Multifunctional Aramid Aerogels

Abstract

Aerogels are quasi-stable, low-density, three-dimensional assemblies of nanoparticles, but they are commonly associated with poor mechanical properties. The most successful efforts to improve their mechanical properties involve cross-linking of the skeletal nanoparticles with polymers. However, post gelation cross-linking is time-consuming. Hence, it is reasonable to seek robust all-polymer aerogels among polymers known for their high mechanical strength. As a result, here we report the facile one-pot synthesis of a new class of Kevlar-like aerogels based on the rather underutilized reaction of multifunctional isocyanates and carboxylic acids. The resulting materials are up to 84% v/v porous with surface areas as high as 380 m 2 g -1. The ultimate compressive strength per unit density is within 10% equal to that of Kevlar 49. The high specific energy absorption (37 J g -1) and Styrofoam-like thermal conductivity (0.028 W m -1 K -1) combined with thermal stability up to 350°C render aramid aerogels multifunctional materials suitable for defense, civil and transportation related applications. Upon pyrolysis at 800°C they can be converted to 80% (v/v) porous, electrically conducting carbons with surface areas as high as 474 m 2g -1. © 2012 Materials Research Society.

Meeting Name

Materials Research Society Fall Meeting (2011, Boston, MA)

Department(s)

Chemistry

International Standard Book Number (ISBN)

9781605113807

International Standard Serial Number (ISSN)

2729172

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2012 Materials Research Society, All rights reserved.


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