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Positron annihilation study of high impact polystyrene |
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| Authors: | Naoki Suzuki Akimitsu Takamori Junpei Baba Junichi Matsuda Toshio Hyodo Yasushi Okamoto Hiroshi Miyagi |
| Institution: | a Institute of Physics, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo153-8902, Japan b Chiba Research Laboraory, Sumitomo Chemical Company, Ltd., 2-1 Kitasode, Sodegaura Chiba 299-0266, Japan |
| Abstract: | Positron lifetime spectra for general purpose polystyrene (GPPS), polybutadiene rubber (PBR), and their copolymers, styrenebutadiene rubber (SBR) and high impact polystyrene (HIPS) have been measured. It has been found that the free volumes in the copolymers are smaller than the average over the individual polymers, due to the interfacial interaction between the styrene and rubber phases. A long-lived component with a mean lifetime of about 123 ns was observed in the spectrum for deformed HIPS, showing the existence of ortho-positronium (o-Ps) in the deformation induced crazes. |
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