X-ray absorption spectromicroscopy study of UV-photoinduced surface modification and anisotropy in polyimide films

Article Abstract:

An extensive study performed in the UV-photo-induced surface anisotropy of PI by near-edge absorption fine structure (NEXAFS) spectroscopy both in the partial (PEY) and total (TEY) electron yield acquisition mode is discussed. The linear polarized deep ultraviolet (LPDUV) irradiation causes an anisotropic decomposition of the PI backbone with the cleavage of the cyclobutane ring to form a maleimide structure as the main decomposition channel.

X-ray spectroscopy, Photochemistry, Structure

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Transformations of the micro-domain structure of polyimide films during thermally induced chemical conversion: characterization via thermodynamics of irreversible processes

Article Abstract:

The transformation of the micro-domain structure of polyimide films during thermally induced chemical conversion from the polyamic acid prepared from 3,3',4,4'-diphenyl tetracarboxylic dianhydride and p-phenylene diamine is investigated with a transmission electron microscopy. The results studied in terms of the kinetic conception of fracture of solids are shown to depend in a defined manner on the domain structure of the polymers.

United States, Observations, Transmission electron microscopes, Atomic properties

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Photoinduced, controlled generation of palladium crystalline structures in polyimide films

Article Abstract:

Structures if Pd crystallites with nanomer dimensions were formed on the surface of an inside polyimide films by a combination of photochemical and thermal processes. Photoinduced transformations of polyamic acid films containing Pd(super 2+) complexes prior to thermal curing affect the subsequent thermal imidization of the polymer and reduction of the remaining palladium ions.

Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Palladium, Crystals, Crystal structure, Optical properties

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