KINETICS OF DISAPPEARANCE OF RADICALS TRAPPED IN IRRADIATED POLYETHYLENE

Journal Article · Sun Jul 01 04:00:00 EDT 1962 · Journal of Chemical Physics (U.S.)

DOI:https://doi.org/10.1063/1.1732938· OSTI ID:4806335

Smith, W V; Jacobs, B E

Development of a technique for determining the concentration of alkyl radicals trapped in irradiated polyethylene using iadio-iodine is described. It is applied to study the kinetics of alkyl radical disappearance in irradiated polyethylene and polypropylene, and the kinetics are interpreted in terms of a simple model. The radicals are assumed to the formed in isolated spherical spurs and rapidly attain an approximately uniform concentration within a spur. This concentration decreases with time due to second-order recombination accompanied by a diffusion-like expansion of the spur. Recombination is increased by hydrogen and the diffusive expansion is increased by hydrogen and by preirradiation. Both processes are faster in polypropylene than in polyethylene. The number of free radicals pei spur after the irradiation decieases with increase in radiation dose, due probably to the effect of the hydrogen produced by irradiation. (auth)

• Research Organization: U.S. Rubber Co., Wayne, N.J.
• Sponsoring Organization: USDOE
• NSA Number: NSA-16-029003
• OSTI ID: 4806335
• Journal Information: Journal of Chemical Physics (U.S.), Journal Name: Journal of Chemical Physics (U.S.) Vol. Vol: 37; ISSN JCPSA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALKYL RADICALS
CHEMISTRY
DIFFUSION
EXPANSION
FREE RADICALS
HYDROGEN
IODINE ISOTOPES
IRRADIATION
POLYETHYLENES
PROPYLENE
REACTION KINETICS