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Prevention of Degradation of Polyamic Acid Solution

IP.com Disclosure Number: IPCOM000088938D
Original Publication Date: 1977-Aug-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Bargon, J: AUTHOR [+3]

Abstract

It has been shown that ultra-pure polyamic acid derived from pyromellitic dianhydride (PMDA) and diamino-diphenyl ether (DADP) is bright yellow in color. When the yellow polymer is dissolved in 1-methyl-2-pyrollidone (NMP), the solution turns dark. The same process does not occur when the polymer is dissolved in dimethyl formamide (DMF). In this case the solution of polyamic acid is not susceptible to chemical degradation.

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Prevention of Degradation of Polyamic Acid Solution

It has been shown that ultra-pure polyamic acid derived from pyromellitic dianhydride (PMDA) and diamino-diphenyl ether (DADP) is bright yellow in color. When the yellow polymer is dissolved in 1-methyl-2-pyrollidone (NMP), the solution turns dark. The same process does not occur when the polymer is dissolved in dimethyl formamide (DMF). In this case the solution of polyamic acid is not susceptible to chemical degradation.

To prevent degradation, instead of NMP, use as solvent DMF, dimethyl sulfoxide (DMSO) or propylene glycol carbonate. These solvents are not as susceptible to oxidation.

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