Characterization of penetrant interactions in Kapton polyimide using a gravimetric sorption technique

Journal Article · Thu Apr 01 00:00:00 EST 1982 · J. Appl. Polym. Sci.; (United States)

DOI:https://doi.org/10.1002/app.1982.070270406· OSTI ID:6735833

Iler, L R; Laundon, R C; Koros, W J

Sorption of pure anhydrous ammonia and pure sulfur dioxide in Kapton polyimide has been measured at 30 and 35/sup 0/C at subatmospheric pressures using a McBain quartz spring balance. The sulfur dioxide sorption and desorption was well described by the Fickian transport model; however, the ammonia sorption exhibited significant deviations from Fickian behavior. A substantial fraction of the initially sorbed ammonia remained in the film after extended periods under vacuum at 35/sup 0/C. Infrared analysis of the treated film revealed the presence of new carbonyl and nitrogen-hydrogen stretching peaks characteristic of primary and secondary amides. These observations suggest that the ammonia reacts chemically with some of the imide linkages. Based on infrared analysis of the ammonia-exposed Kapton, heating the sample under vacuum at 120/sup 0/C caused re-fomation of most of the originally disturbed imide structures, with attendant evolution of ammonia as a condensation product.

• Research Organization: North Carolina State Univ., Raleigh
• OSTI ID: 6735833
• Journal Information: J. Appl. Polym. Sci.; (United States), Vol. 27:4
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AMMONIA
DESORPTION
SORPTION
POLYAMIDES
SORPTIVE PROPERTIES
SULFUR DIOXIDE
DIAGRAMS
EXPERIMENTAL DATA
FICK LAWS
INTEGRAL EQUATIONS
KINETICS
MEDIUM TEMPERATURE
SPECTRA
STEREOCHEMISTRY
CHALCOGENIDES
DATA
EQUATIONS
HYDRIDES
HYDROGEN COMPOUNDS
INFORMATION
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXIDES
OXYGEN COMPOUNDS
POLYMERS
SULFUR COMPOUNDS
SULFUR OXIDES
SURFACE PROPERTIES
400105* - Separation Procedures