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1 Time and Temperature Dependence of Recovery Behavior of Residual Strains in Largely Deformed Glassy Poly (Methyl Methacrylate) by Shin'ya YOSHIOKA*, Ryoji NAKAGAWA** and Yukuo NANZAI* Time and temperature dependence of recovery behavior of residual strains in largely compressed glassy poly (methyl methacrylate) (PMMA) has been studied. At several temperatures lower than the glass transition temperature Tg, uniaxially compressed specimens were isothermally kept in the stress-free state for a variation of time tf, and then subjected to thermally stimulated strain recovery measurement. Thermally stimulated recovery of residual strains in specimens right after the compression began at heating temperatures lower than Tg. With increasing time tf, residual strains recoverable at heating temperatures below Tg decreased simply from those recoverable at the lowest heating temperature. The decrease of residual strains recovering at a heating temperature less than Tg was examined as a function of time tf and was found to be expressed by a single exponential retardation function. Thus, the sub- Tg strain recovery was revealed to be a simple viscoelastic process with distribution of retardation times. Temperatur dependence of the retardation time allowed us to calculate activation energy of sub-tg strain recovery as a function of heating temperature. The activation energy of sub-tg strain recovery was found to be approximately the same function of temperature as that of the linear viscoelastic relaxation of the polymer. This result led us to a conclusion that, as a first approximation, the molecular mechanism governing the sub-tg recovery of strains given by large deformation is almost the same as that of linear viscoelastic relaxation. Key words: Glassy polymer, Poly (methyl methacrylate), Large deformation, Strain recovery, Activation energy
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5 Fig. 6. Activation energy for recovery of residual strains plotted against heating temperature. Solid curve is activation energy for linear viscoelastic relaxation of the same polymer.
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1) i) Barber, M. et al.: Brit. Med J, 2, 565, 19'49. ii) Barber, M.F.G. J. Hayhoe and J. E. M. Whithead: Lancet, 1120 `1125, 1949.-2) Bergey: Bergey's Manual of Determinative Bacteriology 7 th Ed: (1958).-3)
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1-122013 1 2 1 2 20 2,000 2009 12 1 2 1,362 68.1 2009 1 1 9.5 1 2.2 3.6 0.82.9 1.0 0.2 2 4 3 1 2 4 3 Key words acupuncture and moxibustion Treatment with acupuncture, moxibustion and Anma-Massage-Shiatsu
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008 stress behavior at the joint of stringer to cross beam of the steel railway bridge 1115117 1..FEM FEM 3. 4. ABSTRACT 1. BackgroundPurpose The occurrence of fatigue crack is reported in the joint of
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perature was about 2.5 Ž higher than that of the control irrespective of wind speed. With increasing wind speeds of more than 1m/s, the leaf temperatu
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Title 泌尿器科領域に於ける17-Ketosteroidの研究 17-Ketosteroidの臨床的研究 第 III 篇 : 尿 Author(s) 卜部, 敏入 Citation 泌尿器科紀要 (1958), 4(1): 3-31 Issue Date URL
Title 泌尿器科領域に於ける17-Ketosteroidの研究 17-Ketosteroidの臨床的研究 第 III 篇 : 尿 Author(s) 卜部, 敏入 Citation 泌尿器科紀要 (1958), 4(1): 3-31 Issue Date 1958-01 URL http://hdl.handle.net/2433/111559 Right Type Departmental Bulletin
Title 外傷性脊髄損傷患者の泌尿器科学的研究第 3 報 : 上部尿路のレ線学的研究並びに腎機能について Author(s) 伊藤, 順勉 Citation 泌尿器科紀要 (1965), 11(4): Issue Date URL
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