Energy transfer and radiolytic product formation in the system polystyrene–pyrene

Wilske, J.; Heusinger, H.

doi:10.1002/pol.1969.150070401

Cited by 26 publications

(5 citation statements)

References 37 publications

(1 reference statement)

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“…These experiments found a G value of 0.24 molecules per 100 eV for hydrogen production from PMMA, as determined from the slope of the line in Figure 1. The reported G values for hydrogen from PS vary between 0.026 and 0.031 in γ and β radiolysis 30–33. These experiments determine the G value to be 0.033 molecules per 100 eV for hydrogen production in PS at room temperature.…”

Section: Resultsmentioning

confidence: 84%

Hydrogen production in ?-ray and helium-ion radiolysis of polyethylene, polypropylene, poly(methyl-methacrylate), and polystyrene

Chang

LaVerne

2000

J. Polym. Sci. A Polym. Chem.

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Section: Resultsmentioning

confidence: 84%

Hydrogen production in ?-ray and helium-ion radiolysis of polyethylene, polypropylene, poly(methyl-methacrylate), and polystyrene

Chang

LaVerne

2000

J. Polym. Sci. A Polym. Chem.

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“…The low yields may be due to the carbonyl and phenyl side chain groups, respectively. These groups are very effective radical scavengers and H atoms are expected to mainly add to them. , Increasing LET will increase combination reactions with an observed increase in molecular hydrogen yields for these two polymers. However, such a large increase in molecular hydrogen yields as observed in the present studies indicates that H atom production in PMMA and PS is substantial.…”

Section: Resultsmentioning

confidence: 99%

Hydrogen Production in the Heavy Ion Radiolysis of Polymers. 1. Polyethylene, Polypropylene, Poly(methyl methacrylate), and Polystyrene

and

LaVerne

2000

J. Phys. Chem. B

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The production of molecular hydrogen in the radiolysis of isotactic polypropylene (PP), poly(methyl methacrylate) (PMMA), and polystyrene (PS) with protons and carbon ions has been investigated. Previous experimental data on the above polymers with γ-ray and helium ion irradiations have been combined with similar studies on high-density polyethylene (PE) to give a comprehensive survey of the dependence of molecular hydrogen yields on particle linear energy transfer, LET, in the range 0.2-800 eV/nm. The radiation chemical yields of molecular hydrogen are very dependent on LET and generally increase with increasing LET. However, the relative change in hydrogen yield as a function of LET is very different for the various polymers. It appears that with increasing high LET the hydrogen yields for each of the polymers are approaching the same value. This observation suggests that the radiolytic source of molecular hydrogen is similar for all of the polymers and increases with increasing LET of the irradiation. Unexpectedly high yields of molecular hydrogen can have implications in many fields including those that involve heavy charged particles and intense photon sources.

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“…The polyenyl radical that is produced by warming the sample to 2OoC shows the same behavior as does the alkyl radical in the presence of an additive. In the presence of additive S: RX+ + S -RX + S+ (9) Warming to room temperature:…”

Section: Rzmentioning

confidence: 99%

Elementary radical formation and conversion processes in γ‐irradiated polyvinylchloride

Torikai

Adachi

Fueki

1981

J. Polym. Sci. Polym. Chem. Ed.

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SynopsisElementary processes of y-irradiated polyvinylchloride (PVC) have been investigated by both electron spin resonance (ESR) and optical absorption measurements. On irradiating PVC film with y rays at -196OC, alkyl-type radicals are produced. When the PVC film is warmed to room temperature, the radicals convert to polyenyl type. y Irradiation of PVC film containing biphenyl (Ph2) or pyrene (Py) at -196OC yields the corresponding radical cation. The relative ESR peak heights of the radicals decrease and the G values for the formation of cation radicals increase with increasing additive concentrations. These facts indicate that energy is transferred from the precursor of the radicals to the additive. In the case of PVC film containing Py, the Py cation radical decreases and the cyclohexadienyl-type radical from Py is produced by thermal annealing. A possible mechanism for radical formation and conversion is proposed.

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Energy transfer and radiolytic product formation in the system polystyrene–pyrene

Cited by 26 publications

References 37 publications

Hydrogen production in ?-ray and helium-ion radiolysis of polyethylene, polypropylene, poly(methyl-methacrylate), and polystyrene

Hydrogen production in ?-ray and helium-ion radiolysis of polyethylene, polypropylene, poly(methyl-methacrylate), and polystyrene

Hydrogen Production in the Heavy Ion Radiolysis of Polymers. 1. Polyethylene, Polypropylene, Poly(methyl methacrylate), and Polystyrene

Elementary radical formation and conversion processes in γ‐irradiated polyvinylchloride

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