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- W2587384227 abstract "The activation of three polyethylenes, the low density, the high density and the linear low density polyethylene, was determined by means of dynamic mechanical analysis (DMA). Storage modulus and tan δ spectra were obtained as a function of the temperature from −60 to 50 °C with a heating rate of 2° min−1 at frequencies of 1, 2 and 5 Hz and measurement strain amplitude of 10−5. In the tan δ spectra, a small peak in the β region of the three polyethylenes was found and substantiated by subtracting the growing exponential background. This procedure was based on a model that associates the dislocation motion on metals under cyclic stress to vibrating strings and considering the same for the polymeric chains. For the determination of the activation energy we have utilized the frequency versus the reciprocal of the absolute temperature peak of the tan δ. The values obtained for the three polyethylenes, the low density, the high density and the linear low density were, 362 ± 12, 266 ± 9 and 197 ± 6 kJ mol−1, respectively, which were compared with those presented in the literature." @default.
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- W2587384227 date "2017-01-01" @default.
- W2587384227 modified "2023-09-24" @default.
- W2587384227 title "Contribution to the β Relaxation Study of the HDPE, LDPE and LLDPE" @default.
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- W2587384227 doi "https://doi.org/10.1007/978-3-319-51382-9_68" @default.
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