Abstract

A family of ambient-dried poly benzoxazine aerogels is prepared with a facile and scalable process as a high-performance polymeric aerogel with strong and robust thermomechanical properties at elevated temperatures. Those materials are inherently flame-retardant and superhydrophobic over the entire bulk density range (0.24-0.46 g cm-3). In addition, they are mechanically strong with strengths (e.g., 1 MPa at 0.24 g cm-3 at room temperature) higher than those of other high-performance aerogels of similar density, including polyimide and polyamide (Kevlar-like) aerogels as well as polymer-cross-linked X-silica and X-Vanadia aerogels, at a significantly lower cost. Furthermore, unlike most other glassy polymeric materials, the maximum strength of the synthesized aerogels occurs at service temperatures slightly higher than room temperature (about 50 °C), which eliminates the possibility of any drop in strength with respect to the room temperature strength up to 150 °C at all densities. At higher temperatures (up to 250 °C), the overall performance of those aerogels is also stable and robust without any significant drop in Young's modulus or strength levels, which makes them suitable for various industrial applications including high-performance structural and thermal protection applications as an alternative to the significantly more expensive polyimides.

Department(s)

Chemistry

Comments

National Science Foundation, Grant CMMI-1530603

Keywords and Phrases

aerogels; ambient drying; flame-retardant materials; high-performance polymers; polybenzoxazine; superhydrophobic surfaces

International Standard Serial Number (ISSN)

2637-6105

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 American Chemical Society, All rights reserved.

Publication Date

13 Sep 2019

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