2006
DOI: 10.1016/j.jnoncrysol.2006.04.004
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Positron annihilation study of the free volume changes in thermally treated polymers based on acrylate oligomers

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Cited by 8 publications
(6 citation statements)
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“…The intermediate lifetime (τ 2 ~ 0.36 ns) is due to the annihilation of free positrons with electrons in the bulk material and positron trapping modes [8,[14][15][16]. The results of the calculation of the mean values of positron lifetimes for the investigated samples showed the existence of a long-lived component in the positron annihilation lifetime spectra.…”
Section: Resultsmentioning
confidence: 88%
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“…The intermediate lifetime (τ 2 ~ 0.36 ns) is due to the annihilation of free positrons with electrons in the bulk material and positron trapping modes [8,[14][15][16]. The results of the calculation of the mean values of positron lifetimes for the investigated samples showed the existence of a long-lived component in the positron annihilation lifetime spectra.…”
Section: Resultsmentioning
confidence: 88%
“…The formation probability and lifetime of the positronium are extremely sensitive to the electron density surrounding Ps. The o-Ps localises in the space between and along the polymer chains and at chain ends (free volume holes), and the lifetime gives an indication on the mean radii of these holes [5][6][7][8]. The original free volume theory for positron annihilation in molecular substances was proposed by Brandt, Berko and Walker [9].…”
Section: Introductionmentioning
confidence: 99%
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“…The best-defined value for all known data is 1.656 Å. Based on the model proposed by Tao and Eldrup (5), it is possible to link the lifetime of the ortho-positronium (through the “pick-off” process) τ 3 with the size of the free volume penetrated by the posits in the material structure [ 14 , 15 ] as: where τ 3 is the mean lifetime of o-Ps through the “pick-off” process expressed in ns and R is the mean radius of the free volume expressed in nm. In the above equation, after the empirical solution and determining R, we can calculate the free volume size according to the following formula: …”
Section: Introductionmentioning
confidence: 99%
“…The positronium formation probability and lifetime are extremely sensitive to the electron density surrounding Ps. The o-Ps localises in the space between and along polymer chains and at chain ends (free volume holes), and the lifetime gives an indication on the mean radii of these holes [1][2][3][4]. The original free volume theory for the positron annihilation in molecular substances was proposed by Brandt, Berko and Walker [5].…”
Section: Introductionmentioning
confidence: 99%