2007
DOI: 10.1063/1.2773732
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Deuteron and proton spin-lattice relaxation dispersion of polymer melts: Intrasegment, intrachain, and interchain contributions

Abstract: Proton and deuteron field-cycling NMR relaxometry was applied to deuterated and undeuterated bulk polyethyleneoxide and polybutadiene melts and mixtures thereof with molecular weights above the critical value. Spin-lattice relaxation data due to intrasegment (quadrupolar) couplings and intra- and interchain (dipolar) interactions were evaluated. Diverse dynamic limits are identified both with the proton and deuteron frequency dispersion data. The comparison between the intrachain and the interchain contributio… Show more

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Cited by 54 publications
(78 citation statements)
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“…The experimental finding is T 1 / M 0 o 0:4ÁÁÁ0:5 . The attempt to explain this power law by the influence of inter-chain dipolar interaction [49,58] was ruled out since the same behavior was observed in melts of perdeuterated melts of the same species where intramolecular spin interactions dominate [59]. Thus, there is no explanation currently available for this distinct feature of spin-lattice relaxation dispersion in entangled polymer melts.…”
Section: Harmonic Radial Tube Potential (Confined Polymer Chains)mentioning
confidence: 88%
“…The experimental finding is T 1 / M 0 o 0:4ÁÁÁ0:5 . The attempt to explain this power law by the influence of inter-chain dipolar interaction [49,58] was ruled out since the same behavior was observed in melts of perdeuterated melts of the same species where intramolecular spin interactions dominate [59]. Thus, there is no explanation currently available for this distinct feature of spin-lattice relaxation dispersion in entangled polymer melts.…”
Section: Harmonic Radial Tube Potential (Confined Polymer Chains)mentioning
confidence: 88%
“…Indeed, as anticipated above, it has been shown that the intermolecular contribution to R 1 (ω) must not be ignored suggesting that the exponent α might also be influenced by the intermolecular relaxation [13,16,17,25]. Moreover, the intermolecular relaxation is an important source of information regarding translational dynamics in polymer melts.…”
Section: Full Dipolar Correlation Function In Polymer Meltsmentioning
confidence: 99%
“…The dynamics of the investigated systems is mainly reflected through characteristic features of nuclear spin relaxations. Important findings of recent years [7,[11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30], affecting the understanding of the proton spin dynamics in polymer melts are the subject of discussion of this paper.…”
mentioning
confidence: 99%
“…Proton and fluorine spin-lattice relaxation are dominated by the same function modified by a small and usually negligible translational contribution, which can only be identified at low frequencies using a special experimental protocol. 18 Transverse NMR relaxation also depends on this sort of correlation function with m = 0, 1, 2. The spherical harmonics in Eq.…”
mentioning
confidence: 99%