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Ultra Pure Polyimide from PMDA and 4, 4' Diaminodiphenyl Ether

IP.com Disclosure Number: IPCOM000088300D
Original Publication Date: 1977-May-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Duran, J: AUTHOR [+2]

Abstract

Pyromellitic dianhydride (PMDA) and 4,4' diaminodiphenyl ether were each progressively and ultimately purified by extensive zone refining. Each material, following completion of purification, can withstand unlimited melt-freeze cycles in vacuo with no trace of discoloration or degradation. This is in great contrast to material not zone-refined.

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Ultra Pure Polyimide from PMDA and 4, 4' Diaminodiphenyl Ether

Pyromellitic dianhydride (PMDA) and 4,4' diaminodiphenyl ether were each progressively and ultimately purified by extensive zone refining. Each material, following completion of purification, can withstand unlimited melt-freeze cycles in vacuo with no trace of discoloration or degradation. This is in great contrast to material not zone-refined.

Both materials must be processed in an inert atmosphere. The use of a light sensitive solvent required protective measures. Prepurified dimethylformamide (DMF) was selected as the solvent to be used.

The polyamic-acid formed a weak, pale yellow, charge transfer complex.

Cyclization to a polyimide of a 4-5 Mu film in air, to 350 Degrees C, showed excellent adhesion to a quartz substrate, no darkening, and remained uniformly light yellow in color.

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