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- W2109494680 abstract "Thermally stimulated current (TSC) was used to study molecular relaxations in polyethylene terephthalate (PET) bottles. Unstretched PET film, which was used as a model for the bottle preform, exhibited two peaks at 77 and 90°C that correspond to the α and ρ relaxation processes, respectively. The bottles exhibited only the ρ relaxation, which is located within the temperature range for blow molding PET bottles. The α peak is associated with the main glass transition temperature (Tg) and the ρ peak may be associated with a second Tg. The second Tg is attributed to a “constrained state,” which shows dipolar behavior. Heat-shrinkage behavior was examined at 90°C. The maximum TSC (Im) of the ρ peak decreased with increasing heat set temperature, and with decreasing shrinkage. Bottles blown at 113°C showed a lower Im and shrinkage than those blown at 103°C for equivalent heat set temperatures. The higher blowing temperature allowed a higher stretch speed that produced higher crystallinity bottles with self-heat generation during rapid deformation. A relationship between the shrinkage mechanism and the dipole relaxation was proposed." @default.
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- W2109494680 date "2000-02-01" @default.
- W2109494680 modified "2023-09-27" @default.
- W2109494680 title "Correlation of thermally stimulated current and blow molding condition in poly(ethylene terephthalate) bottles" @default.
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- W2109494680 doi "https://doi.org/10.1002/pen.11172" @default.
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