A comparison of the physical and chemical vitrification is reported. Despite the differences in the molecular processes involved in chemical and physical vitrification, surprising similarities are observed in the dynamics and in the thermodynamical properties of the resulting glasses. We report on a systematic study of reactive glass formers following a process involving progressive polymerization of the constituent molecules via the formation of irreversible chemical bonds. The formation of most of the materials used in engineering plastics and the hardening of natural and synthetic resins, including epoxy glues, are based on chemical vitrification. The clear analogies on different time scales characterizing different physical universal behavior of the structural arrest are shown.
Different routes to the glass transition: a comparison between chemical and physical vitrification
COREZZI, Silvia
2012
Abstract
A comparison of the physical and chemical vitrification is reported. Despite the differences in the molecular processes involved in chemical and physical vitrification, surprising similarities are observed in the dynamics and in the thermodynamical properties of the resulting glasses. We report on a systematic study of reactive glass formers following a process involving progressive polymerization of the constituent molecules via the formation of irreversible chemical bonds. The formation of most of the materials used in engineering plastics and the hardening of natural and synthetic resins, including epoxy glues, are based on chemical vitrification. The clear analogies on different time scales characterizing different physical universal behavior of the structural arrest are shown.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
