Photolysis of polydimethylsiloxane by light at 147 and 123. 6 nm

Journal Article · Tue Nov 01 04:00:00 EST 1988 · High Energy Chem. (Engl. Transl.); (United States)

OSTI ID:6083380

Dorofeev, Yu L; Skurat, V E

Mass spectrometry and optical absorption spectrometry in the wavelength interval 120-300 nm are used to study the photolysis of polydimethylsiloxane by light at 147 and 123.6 nm. The primary gaseous products are CH/sub 4/, H/sub 2/, and C/sub 2/H/sub 6/. During photolysis at 147 nm detachment of H atoms predominates and at 123.6 nm, detachment of H/sub 2/ molecules. The formation of cross links during photolysis causes suppression of the Rydberg transition bands n ..-->.. 3s and n ..-->.. 3p (lambda approx. = 175 nm) in the absorption band owing to a reduction in the intermolecular distances (photodensification of the polymer) and to a reduction in the efficiency of methane formation that is more rapid (by a factor of approx.5) than the release of methyl groups.

• OSTI ID: 6083380
• Journal Information: High Energy Chem. (Engl. Transl.); (United States), Journal Name: High Energy Chem. (Engl. Transl.); (United States) Vol. 22:3; ISSN HIECA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ABSORPTION
ABSORPTION SPECTRA
ALKANES
ALKYL RADICALS
BAND THEORY
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COLLISIONS
CROSS-LINKING
DECOMPOSITION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY ABSORPTION
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
ETHANE
EXCITED STATES
FILMS
HYDROCARBONS
HYDROGEN
KINETICS
MASS SPECTRA
MASSLESS PARTICLES
METHANE
METHYL RADICALS
MOLECULAR STRUCTURE
MOLECULE COLLISIONS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
ORGANIC SILICON COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PHOTON COLLISIONS
PHOTON-MOLECULE COLLISIONS
PHOTONS
POLYMERIZATION
POLYMERS
RADICALS
REACTION KINETICS
RYDBERG STATES
SILOXANES
SPECTRA
WAVELENGTHS
YIELDS