Pulse radiolysis of polyethylene films: Formation of ions and excited states of aromatic solutes

Johnson, George; Willson, Andrew

doi:10.1016/0146-5724(77)90014-0

Cited by 17 publications

(6 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pulse radiolysis of polyethylene films containing pyrene gives transient absorption spectra typical of pyrene excited states and radical ion species 1 Py*, 3 Py*, Py +• , Py -• . , Figure shows the transient absorption spectra of 10 mol/m 3 pyrene in Rx immediately after the pulse, 4 ms later, and 3 s after the pulse was given. The bands at 498, 385, and 365 nm are assigned to the pyrene radical anion (Py -• ), 455 nm to the pyrene radical cation (Py +• ), and 415 nm to the pyrene triplet state ( 3 Py*)…”

Section: Resultsmentioning

confidence: 99%

Radiolysis of Polyethylene Films Containing Arenes: Bromopyrene Dissociation and Pyrene Binding in Polymer Films

and

Thomas

1999

J. Phys. Chem. B

View full text Add to dashboard Cite

Radiation induced dehalogenation of haloarenes and binding of arenes have been studied in polyolefin films. Dehalogenation takes place from a highly excited triplet state that is formed by the recombination of arene radical ions, while binding takes place through a polymer aryl radical intermediate. The latter process is dependent on the reactivity of the polymer radical and decreases in low molecular weight and branched polymer films. It is found that energy deposited by high-energy irradiation is transferred efficiently out of the crystalline zones and into the amorphous zones of the polymer.

show abstract

Section: Resultsmentioning

confidence: 99%

Radiolysis of Polyethylene Films Containing Arenes: Bromopyrene Dissociation and Pyrene Binding in Polymer Films

and

Thomas

1999

J. Phys. Chem. B

View full text Add to dashboard Cite

show abstract

“…Familiarity with the concepts briefly illustrated in 92 is made easier by the several books and reviews dealing primarily with radiation chemistry and its applications in general chemistry and radiation biology (e.g. Adams 1972, Adams and Wardman 1977, Allen 1961, Baxendale and Rodgers 1978, Burton and Magee 1969-76, Dainton 1975, Denaro and Jayson 1972, Dorfman 1974, Draganic and Draganic 1971, Ebert et a1 1965, Fendler and Fendler 1970, Gould 1965, 1968, Hart and Anbar 1970, Hunt 1976, Matheson 1975, Matheson and Dorfman 1969, Mozumder and Magee 1975b, Neta 1976, O'Donnell and Sangster 1969, Pikaev 1967, Shafferman and Stein 1975, Spinks and Woods 1976, Stein 1968, Swallow 1973, Ward 1975, Willson 1977. Thus both the concepts needed to devise an experiment and the information required to choose suitable experimental conditions are generally available, or can be derived without much difficulty.…”

Section: Basic Requirements and Experimental Conditionsmentioning

confidence: 99%

Application of pulse radiolysis methods to study the reactions and structure of biomolecules

Wardman

1978

Rep. Prog. Phys.

View full text Add to dashboard Cite

T o study reactions occurring on timescales faster than N 10-&lo-3 s, simple mixing of reagents is too slow and other methods of initiating reactions have to be used. Pulses of thermal energy, light quanta or ionising radiation have been used to perturb chemical and biological systems from equilibrium. Pulse radiolysis is the more recent of these three methods of initiating fast reactions, and this review emphasises the versatility of this technique for studying events occurring between 10-11 and 1 0 2 s after energy absorption. The extent and tiniescale of radiation damage in dilute aqueous solutions are outlined and the facile manipulation of experimental conditions to isolate a single reactive species is illustrated. The basic requirements for the radiation pulse and detection system are discussed. T h e experimental techniques which have been used to monitor fast reactions following pulse radiolysis include optical absorption spectroscopy and light scattering, and timeresolved electrical conductivity, polarography, and electron spin resonance spectroscopy. Some applications of pulse radiolysis to study fast reactions of biologically important molecules are illustrated, including the kinetics and thermodynamics of redox processes and electron-transfer reactions, enzymic processes and structural effects which are revealed by physical or kinetic properties.

show abstract

“…Sim-5600 Hamamatsu photomultiplier, 19 it was possible to detect weak traces of Py excimer emission ilar absorption bands attributed to e 0 t were found in the case of polyethylene. 3,5,11,20 The yield of e 0 t generated with a ca. 10 ns delay for 0.01 mol dm…”

Section: Resultsmentioning

confidence: 99%

Ionic and excited intermediates in pulse-irradiated polypropylene doped with aromatics

Mayer¹,

Szreder²,

Szadkowska–Nicze³

et al. 1998

J. Polym. Sci. A Polym. Chem.

View full text Add to dashboard Cite

Pulse radiolysis of polyethylene films: Formation of ions and excited states of aromatic solutes

Cited by 17 publications

References 21 publications

Radiolysis of Polyethylene Films Containing Arenes: Bromopyrene Dissociation and Pyrene Binding in Polymer Films

Radiolysis of Polyethylene Films Containing Arenes: Bromopyrene Dissociation and Pyrene Binding in Polymer Films

Application of pulse radiolysis methods to study the reactions and structure of biomolecules

Ionic and excited intermediates in pulse-irradiated polypropylene doped with aromatics

Contact Info

Product

Resources

About