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Positron annihilation study of the free volume changes in thermally treated polymers based on acrylate oligomers

“…Larger values of the free volume in D-1 and D-2 with respect to D-5-2 were explained by different sample compositions [10,11]. It seems to be connected with the presence of DMOEM content in composition of the sample, their chains are shorter.…”

“…Therefore, during the fitting for the shortest lifetime, As the o-Ps component is relevant to the free-volume properties, and it is markedly sensitive to the microstructure changes, in this paper, our main attention is paid to the s 3 and I 3 . The lifetime parameters for the samples in the initial state, before thermal treatment, have already been reported [10][11][12]. The variations of o-Ps pick-off lifetime and its intensity for the investigated samples before and after thermal treatment are presented in Table 2.…”

Gamma irradiation effects on UV-cured polymers based on acrylate oligomers studied by positron annihilation lifetime spectroscopy

“…If this happens then we have to observe a decrease in V f and s 3 and an increase in I 3 , respectively. On the other hand, it was found in [9][10][11] that intensity is not affected by crosslinking process. Thus degradations seem to be the more likely explanation.…”