1998
DOI: 10.1002/(sici)1521-4044(199809)49:9<495::aid-apol495>3.0.co;2-z
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NMR and dynamic mechanical studies of drawn polypropylene fibers

Abstract: The influence of drawing on the relaxation processes connected with the glass transition in polypropylene fibers have been studied in terms of the spin—lattice relaxation times T1 and the storage and loss components of the dynamic modulus measured at different temperatures. The measurements were carried out at the frequencies f0 = 30 MHz and fE = 110 Hz, respectively. The experimental results were interpreted using the Williams—Landel—Ferry (WLF) theory. Glass transition tempera‐tures Tg and correlation times … Show more

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Cited by 5 publications
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“…The constant C of eq 2 is 2.9 × 10 9 s -2 , of the expected order of magnitude. 5,29 The correlation times τ of eqs 6 and 7, calculated for the two dynamic processes, are reported in Figure 4. It is interesting to note that given the very different thermal activation of the two processes, the difference between the two correlation times decreases from 8 to only 1 order of magnitude on passing from the glass-transition temperature to 80 °C.…”
Section: J(ω) )mentioning
confidence: 99%
“…The constant C of eq 2 is 2.9 × 10 9 s -2 , of the expected order of magnitude. 5,29 The correlation times τ of eqs 6 and 7, calculated for the two dynamic processes, are reported in Figure 4. It is interesting to note that given the very different thermal activation of the two processes, the difference between the two correlation times decreases from 8 to only 1 order of magnitude on passing from the glass-transition temperature to 80 °C.…”
Section: J(ω) )mentioning
confidence: 99%