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000189954 037__ $$aFZJ-2015-02922
000189954 041__ $$aEnglish
000189954 1001_ $$0P:(DE-Juel1)162191$$aUnidad, Herwin Jerome$$b0$$eCorresponding Author$$ufzj
000189954 1112_ $$a79th Annual Meeting of the DPG and DPG Spring Meeting$$cBerlin$$d2015-03-15 - 2015-03-20$$gDPG2015$$wGermany
000189954 245__ $$aChain Dynamics near the Unentangled-Entangled Transition of Polymer Melts
000189954 260__ $$c2015
000189954 3367_ $$0PUB:(DE-HGF)6$$2PUB:(DE-HGF)$$aConference Presentation$$bconf$$mconf$$s1430398330_14198$$xOther
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000189954 3367_ $$2BibTeX$$aINPROCEEDINGS
000189954 520__ $$aIt is well-known that the transition between unentangled to entangled dynamics occurs at a critical molecular weight (Mc), typically assumed to be twice the entanglement molecular weight (Me). Recently, we have reiterated a previous finding that the ratio between Mc and Me doesn't assume a universal value of 2 for all polymer melts but in fact shows a dependence on the packing length (p). Not withstanding, the physical picture behind the independent existence of Me and Mc remains unclear.Here, we reinvestigate the problem by probing the microscopic dynamics of polybutadiene melts near the transition by neutron spin echo spectroscopy. We analyze the dynamic structure factor within the framework of the Rouse model with modified mode spectrum. We find that suppression of long-wavelength modes in the spectra already occurs for melts with molecular weight above Me, even if they are still below Mc. We rationalize these results based on earlier ideas on entanglement formation. We also apply this framework in confronting our viscosity data for various polymers.
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000189954 65017 $$0V:(DE-MLZ)GC-140$$2V:(DE-HGF)$$aSoft Matter, Macromolecules, Complex fluids, Biophysics $$x0
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000189954 693__ $$0EXP:(DE-MLZ)J-NSE-20140101$$1EXP:(DE-MLZ)FRMII-20140101$$5EXP:(DE-MLZ)J-NSE-20140101$$6EXP:(DE-MLZ)NL2ao-20140101$$aForschungs-Neutronenquelle Heinz Maier-Leibnitz $$eJ-NSE: Neutron spin-echo spectrometer$$fNL2ao$$x0
000189954 7001_ $$0P:(DE-Juel1)131056$$aZamponi, Michaela$$b1$$ufzj
000189954 7001_ $$0P:(DE-Juel1)136923$$aIvanova, Oxana$$b2$$ufzj
000189954 7001_ $$0P:(DE-Juel1)131036$$aWillner, Lutz$$b3$$ufzj
000189954 7001_ $$0P:(DE-Juel1)130902$$aPyckhout-Hintzen, Wim$$b4$$ufzj
000189954 7001_ $$0P:(DE-Juel1)131040$$aWischnewski, Andreas$$b5$$ufzj
000189954 7001_ $$0P:(DE-Juel1)130917$$aRichter, Dieter$$b6$$ufzj
000189954 7001_ $$0P:(DE-HGF)0$$aFetters, Lewis J.$$b7
000189954 773__ $$y2015
000189954 8564_ $$uhttp://www.dpg-verhandlungen.de/year/2015/conference/berlin/part/cpp/session/21/contribution/7
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000189954 9141_ $$y2015
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