Open spaces and molecular motions of acrylic epoxy‐based network polymers probed by positron annihilation

Free volumes and structural relaxations in diglycidyl ether of bisphenol-A based epoxy–polyether amine networks

“…17,38 Positron annihilation lifetime spectroscopy (PALS) is an analytical tool capable of quantifying the nanoholes that are in the order of 2 to 20 Å in diameter, which are consistent with many of the interchain dimensions occurring in most polymers. 39 The effect of changes in the molecular topology of epoxy-amine networks on the free volume content has been studied extensively using PALS. 39,40 The cumulative effects of structural relaxations, especially the sub-T g ones, and the free volume content on the moisture uptake of epoxy-amine networks have been elegantly studied by Soles et al [41][42][43] and more recently by other researchers.…”

“…39 The effect of changes in the molecular topology of epoxy-amine networks on the free volume content has been studied extensively using PALS. 39,40 The cumulative effects of structural relaxations, especially the sub-T g ones, and the free volume content on the moisture uptake of epoxy-amine networks have been elegantly studied by Soles et al [41][42][43] and more recently by other researchers. 44,45 From a fundamental point of view, the structural relaxations and free volume characteristics of epoxy-amine networks continue to be a topic of interest among researchers.…”