Processing and Mechanical Characterization of Polyurea Aerogels

Abstract

The polyurea aerogels (PUA) were created by reacting triisocyanate Desmodur N3300a and water using triethylamine as a catalyst in a solution of acetone. Three PUA with densities 0.12 g/cm3, 0.17 g/cm3 and 0.33 g/cm3 were fabricated tested and used in model simulation. Quasi-static testing was conducted for mechanical strength in tension, compression, and shear. Testing was also conducted in dynamic tension and bending. Simulations were performed to develop a better understanding of structure-property response of PUA. Micro-scale effects such as particle stiffness, bond strength, and particle frictional coefficients were incorporated into the macro-scale structure-property relationship for the prediction of the Young's modulus. the results indicate that polyurea aerogels are not particularly sensitive to various mid-range frequencies. the change in storage modulus across the tested range was minimal. the 0.17 g/cm3 damped the oscillatory motion more effectively in tension than the other two densities. Compression simulations using PFC3D were completed using the PUA model. Simulations showed that the shear and normal stiffness of the particles were equivalent rather than a ratio as suggested by literature.

Meeting Name

14th Biennial International Conference on Engineering, Science, Construction, and Operations in Challenging Environments: Engineering for Extreme Environments, Earth and Space 2014 (2014, St. Louis)

Department(s)

Mechanical and Aerospace Engineering

Second Department

Chemistry

International Standard Book Number (ISBN)

978-0784479179

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2014 American Society of Civil Engineers (ASCE), All rights reserved.

Publication Date

01 Jan 2014

Link to Full Text

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