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Your search keyword '"M. Y. Ruan"' showing total 2 results
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2 results on '"M. Y. Ruan"'

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

Author

Robert Simha, A. M. Jamieson, M. Y. Ruan, H. Moaddel, and J. D. McGervey

Subjects
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
Abstract

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

Published
1992

2. Positron Lifetimes and Free Volume of Polycarbonate under Tensile Strain

Author

M. Y. Ruan, Alexander M. Jamieson, John D. McGervey, Z. Yu, H. Moaddel, and Robert Simha

Subjects
Positron, Materials science, Volume (thermodynamics), Mechanics of Materials, Mechanical Engineering, visual_art, visual_art.visual_art_medium, General Materials Science, Tensile strain, Polycarbonate, Composite material, Condensed Matter Physics
Published
1992

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