| TSC STUDIES ON SUB-Tg STORAGE OF POLYETHYLENE TEREPHTHALATE |
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| 作者姓名： | 李炜 童刚 周漪琴 漆宗能 |
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| 作者单位： | Department of Applied Chemistry，University of Science and Technology of China，Hefei Institute of Chermstry，Academla sinica，Beliing，Department of Applied Chemistry，University of Science and Technology of China，Hefei，Department of Applied Chemistry，University of Science and Technology of China，Hefei，Institute of Chemistry，Academia Sinica，Beijing |
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| 摘 要： | The Thermally Stimulated Current (TSC) spectra of a series of Sub-T_θannealed polyethylene terephthalate (PET) specimens have been measured. It is found that there is only one peak at 80℃above room temperature, which related to the thermo-relaxation of frozen-in dipoles. The activation energy of such dipole motion has been calculated. The relation between the maximum current and the storage time can be explained by the free volume theory and agrees with the results from the excess thermodynamic properties. Compared with Differential Scanning Calorimeter (DSC) and tensile stress-strain method, TSC is a simpler and more sensitive method in studying Sub-T_θannealed polymers.
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| 关 键 词： | Polyethylene terephthalate Sub-T_θ Storage TSC Studies. |
| 收稿时间： | 1984-08-09 |
TSC STUDIES ON SUB-Tg STORAGE OF POLYETHYLENE TEREPHTHALATE |
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| LI Wei,TONG Gang,ZHOU Yiqin,QI Zongneng.TSC STUDIES ON SUB-Tg STORAGE OF POLYETHYLENE TEREPHTHALATE[J].Chinese Journal of Polymer Science,1987,0(4):285-291. |
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| Authors: | LI Wei TONG Gang ZHOU Yiqin QI Zongneng |
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| Institution: | Department of Applied Chemistry; University of Science and Technology of China; Hefei Institute of Chermstry; Academla sinica; Beliing; Hefei; Institute of Chemistry; Academia Sinica; Beijing |
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| Abstract: | The Thermally Stimulated Current (TSC) spectra of a series of Sub-Tθ annealed polyethylene terephthalate (PET) specimens have been measured. It is found that there is only one peak at 80℃ above room temperature, which related to the thermo-relaxation of frozen-in dipoles. The activation energy of such dipole motion has been calculated. The relation between the maximum current and the storage time can be explained by the free volume theory and agrees with the results from the excess thermodynamic properties.Compared with Differential Scanning Calorimeter(DSC) and tensile stree-strain method,TSC is a simpler and more sensitive method in studying Sub-Tg annealed polymers. |
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