Effect of a derivatized oxide layer and environment on the bond durability of aluminum/polyimide and titanium/polyimide bonds

A surface pretreatment for aluminum and titanium involving the reaction of phosphonic acid (RPO(OH)2), R=butyl or vinyl for aluminum and R=vinyl for titanium, has been investigated. The durability of phosphonic acid-pretreated samples was compared with that for P2-etched (ferric sulfate-sulfuric acid) adherends. Samples were bonded with LaRC-IA adhesive in a wedge test geometry. Environmental testing consisted of static and cyclical exposure for 240 hours in three atmospheres: 1) 170°C, 2 torr; 2) -20°C; 3) 60°C, 70% relative humidity. Crack propagation arrested within 48 hours. The order of durability in static environmental tests for aluminum was vinyl phosphonic acid > P2 > butyl phosphonic acid. The durability performance was reversed for cyclic testing. The durability of specimens using P2-etched titanium was superior to that for vinyl phosphonic acid-treated titanium in all environmental tests.

Name thesis:degree_name

Master of Science

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

Chemistry

Department dc:contributor.department

Chemistry

Grantor dc:publisher

Virginia Tech

Year dc:date.issued

1994

Author dc:creator

• Holmes, Brenda L.

Chair dc:contributor.committeechair

• Dillard, John G.

Committee members dc:contributor.committeemember

• Webster, H. F.
• Wightman, James P.

Statement dc:rights

• In Copyright

Licence dc:rights.uri

• http://rightsstatements.org/vocab/InC/1.0/

Language dc:language.iso

en

Dc Identifier Other

etd-03142009-040506

OAI identifier oai:identifier

oai:vtechworks.lib.vt.edu:10919/41597