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Moisture-Resistant Polyimide Aerogels Containing Propylene Oxide Links in the Backbone

Moisture-Resistant Polyimide Aerogels Containing Propylene Oxide Links in the Backbone

Mary Ann B Meador, Marika Agnello, Linda McCorkle, Stephanie L Vivod, Nathan Wilmoth

ACS Appl Mater Interfaces. 2016 Oct 26;8(42):29073-29079.

PMID: 27731971

Abstract:

Polyimide aerogels made using anhydride-capped oligomers from 4,4'-oxydianiline (ODA) and 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA) cross-linked with 1,3,5-tri(aminophenoxy)benzene (TAB) have been reported with very good mechanical properties but poor resistance to moisture. Replacing 50 mol % of the ODA with poly(propylene glycol)bis(2-aminopropyl ether) (PPG) with an average molecular weight of 230 g/mol in the oligomer backbone gives aerogels with water contact angles of 80°. The aerogels also absorb very little moisture on soaking in water. The aerogels also shrink less with increasing PPG concentration and therefore have significantly lower density and higher porosity than those made without PPG. Mechanical properties of the aerogels increased with increasing density, regardless of the polymer backbone. Brunauer-Emmett-Teller (BET) surface area of the aerogels studied ranged from 300 to 400 m2/g, depending mainly on PPG concentration. The high moisture resistance makes them promising materials for substrates for lightweight antennas as well as insulation for a variety of applications.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP9046100	Poly(propylene glycol) bis(2-aminopropyl ether)		9046-10-0	Price

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