Bonding aerogels with polyurethanes

Aerogels, porous silica glasses with ultra-fine cell size (30nm), are made by a solution gelation (sol-gel) process. The resulting gel is critical point dried to densities from 0.15--0.60 g/cc. This material is machinable, homogeneous, transparent, coatable and bondable. To bond aerogel an adhesive...

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Bibliographic Details
Main Authors: Matthews, F.M., Hoffman, D.M.
Language:unknown
Published: 2021
Subjects:
36 MATERIALS SCIENCE
GELS
ADHESION
URETHANE
COATINGS
MECHANICAL PROPERTIES
SILOXANES
CARBAMATES
CARBONIC ACID DERIVATIVES
CARBOXYLIC ACID SALTS
COLLOIDS
DISPERSIONS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SILICON COMPOUNDS
Psi
Carbonic acid
Online Access:http://www.osti.gov/servlets/purl/5374655
https://www.osti.gov/biblio/5374655
Description
Summary:Aerogels, porous silica glasses with ultra-fine cell size (30nm), are made by a solution gelation (sol-gel) process. The resulting gel is critical point dried to densities from 0.15--0.60 g/cc. This material is machinable, homogeneous, transparent, coatable and bondable. To bond aerogel an adhesive should have long cure time, no attack on the aerogel structure, and high strength. Several epoxies and urethanes were examined to determine if they satisfied these conditions. Bond strengths above 13 psi were found with double bubble and DP-110 epoxies and XI-208/ODA-1000 and Castall U-2630 urethanes. Hardman Kalex Tough Stuff'' A-85 hardness urethane gave 18 psi bond strength. Hardman A-85, Tuff-Stuff'' was selected for further evaluation because it produced bond strengths comparable to the adherend cohesive strength. 5 refs., 2 figs.

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