Electron paramagnetic resonance investigation of free radicals in polymide films

Journal Article · Thu Jun 14 04:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100375a071· OSTI ID:6194195

George, M A; Ramakrishna, B L; Glaunsinger, W S ^[1]

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1. Arizona State Univ., Tempe (USA)

Both unirradiated and far-ultraviolet irradiated Kapton H polyimide films have been investigated by electron paramagnetic resonance spectroscopy as a function of temperature, microwave power, irradiation time, and chemical treatment. Free radicals are always observed in the bulk. Irradiation of Kapton H films in air produces relatively stable oxidized and unoxidized aromatic-type radicals in close vicinity of the surface, whereas film irradiation in the absence of oxygen yields only the latter radicals. The g values, line widths, spin concentrations, and relaxation times of both the bulk radicals in unirradiated films and the surface radicals in films irradiated in air have been determined. It was found that irradiation of Kapton H enhanced the adhesion of gold films to the polyimide surface. On the basis of the results of this study, a qualitative model for the radical-formation mechanism is proposed.

• OSTI ID: 6194195
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:12; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
DATA
DATA ANALYSIS
ELECTRON SPECTROSCOPY
EXPERIMENTAL DATA
FILMS
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYAMIDES
POLYMERS
RADICALS
SPECTROSCOPY