Free Volume in Plastified Poly(Vinyl Chlorate)

Abstract

Positron lifetimes measurements in pure poly(vinyl chlorate) (PVC) and in plastified PVC were performed. Three different plasticizers were used: dibutyl phtalate, dioctyl phtalate and tricresyl phosphate. The measured samples were prepared of PVC with two different plasticizers concentration (20% and 30% of the plasticizers in the poly(vinyl chlorate)). Alł the measurements were performed in air at room temperature. A conventional fast-slow coincidence lifetime spectrometer was used for the measurements. Free volume radii were calculated from the lifetime data.

The Influence of Filtration of Atrasine on the Spectrum of Positron Lifetimes in Immobilized Liquid Filtration Membranes

“…In order to determine the sizes of free volumes in substances in which positronium forms (e.g. voids in gels and liquids) this technique was widely applied by Goworek et al [1][2][3][4][5][6][7], Jerie et al [8][9][10][11][12], Osoba [13][14][15][16][17] and others [18][19][20]. The theoretical relation between ortho-Ps and the dimensions of internal "voids", as offered by Tao [21] and Eldrup et al [22], has been made use of in the present work.…”

Spectra of Positrons Lifetimes in Choose Gel Drugs

“…For several years now the technique of measuring positrons lifetimes has been used to determine empty spaces in liquids [1][2][3][4][5] and porous materials, including gels [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. In the paper [21] the results of measurements of positrons lifetimes in medical preparations of insulin were presented, in which, applying the model of annihilation of ortho-Ps in empty spaces (as proposed by Tao [22] and Eldrup et al [23]), we determined the radii of empty spherical spaces in preparations of different technologies of manufacture.…”