1983
DOI: 10.1002/pol.1983.180211107
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Pulsed NMR observation of ultradrawn polypropylene

Abstract: Proton spin‐spin relaxation times have been measured as a function of temperature for ultradrawn polypropylene with draw ratios λ up to 24. The three relaxation times T2a (the longest), T2i (intermediate), and T2c (the shortest), observed for all the samples, have been ascribed to the relaxations of the amorphous, constrained amorphous, and crystalline components, respectively. T2i and T2a, which reflect the changes in structure and mobility in the noncrystalline regions, decrease with increasing λ; T2i become… Show more

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Cited by 21 publications
(10 citation statements)
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“…These effective interproton distances were calculated according to Eq. (5) with fulfilled condition (6). For relaxation constant C was used the expression for rigid lattice approximation [1, p. 42].…”
Section: Spin-lattice Relaxation Times Tmentioning
confidence: 99%
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“…These effective interproton distances were calculated according to Eq. (5) with fulfilled condition (6). For relaxation constant C was used the expression for rigid lattice approximation [1, p. 42].…”
Section: Spin-lattice Relaxation Times Tmentioning
confidence: 99%
“…There are several papers dealing with relaxation properties of the partially crystalline PP by using the pulsed NMR techniques [1][2][3][4][5][6]. A lot of investigators [4,7,8] analysed the broad-line NMR spectrum.…”
Section: Introductionmentioning
confidence: 99%
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“…On oriented isotactic polypropylene films and fibers, several works have already been reported [3][4][5]. There are, however, few investigations of the relaxation effects on the thermally shrunk sample.…”
Section: Introductionmentioning
confidence: 97%
“…In the second part of this series the form of the master curve is discussed in terms of the modified Graessley theory. [11][12][13][14] The shift parameter TO [cf. eq.…”
Section: Introductionmentioning
confidence: 99%