Positron annihilation lifetime studies of free volume changes in polycarbonate under static tensile deformation

Autor:	Robert Simha, A. M. Jamieson, M. Y. Ruan, H. Moaddel, J. D. McGervey
Rok vydání:	1992
Předmět:	Bisphenol-A-polycarbonate Materials science Polymers and Plastics Annealing (metallurgy) Organic Chemistry Inorganic Chemistry Equilibrium density visual_art Ultimate tensile strength Materials Chemistry visual_art.visual_art_medium Polycarbonate Composite material Positron annihilation
Zdroj:	Macromolecules. 25:2407-2411
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma00035a018
Popis:	It is found that, for well aged bisphenol A polycarbonate (PC), the fractional free volume h increases with strain up to a level of 4%, after which no further change in h occurs. This behaviour is consistent with literature observations of strain-enhanced rejuvenation of the mechanical properties of polycarbonate. Upon long-term room-temperature annealing of a PC specimen held at 3% strain, it is found that h gradually decreases to levels below the initial value, suggesting a strain-induced reactivation of physical ageing, and hence a closer approach to the equilibrium density
Databáze:	OpenAIRE
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