On the aging characterization of poly(ethylene terephthalate) by positron spectroscopy |
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| Affiliation: | 1. Department of Physics, Wuhan University, Wuhan 430072, China;2. Department of Materials Science & Engineering, University of Science and Technology of China, Hefei 230026, Anhui, China;1. School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney 2052, Australia;2. School of Computer Science and Technology, Shaoxing University, Shaoxing, Zhejiang 312000, China;3. Department of Electrical Engineering, National Chung Cheng University, No. 168, University Rd, Min-Hsiung Township, Chiayi County 621, Taiwan;4. Key Laboratory of Modern Design and Rotor Bearing System of Ministry, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China;1. College of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China;2. Department of Applied Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;3. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA;4. Department of Materials Physics, and IEMM, Nanjing University of Information Science and Technology, Nanjing 210044, China |
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| Abstract: | Positron spectroscopy was used to study the free volume properties of glassy poly(ethylene terephthalate) as a function of temperature and aging time. The experimental results indicate that the glass transition temperature increases with increasing aging time. This is confirmed by differential scanning calorimetry measurements. From the aging time dependence of the intensity of the ortho-positronium (o-Ps) component I3 and the fractional free volume, we observe that the concentration of free volume holes and the fractional free volume show a continuous decrease at a fixed aging temperature, which suggests that structural relaxation and segmental rearrangement occur during physical aging. |
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