Are Entangled Polymer Melts Different From Solutions?

Publication: ResearchConference abstract for conference – Annual report year: 2012

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The possible existence of a qualitative difference on extensional steady state viscosity between polymer melts
and polymer solutions is still an open question. Recent experiments [1-4] showed the extensional viscosity of both
polymer melts and solutions decayed as a function of strain rate with an exponent of -0.5. When the strain rate
became higher than the order of inverse Rouse time, the polymer solutions showed an upturn [1, 4]. However, in
the same regime for polymer melts, the experiments were contrary: some of the experiments showed an upturn
[4, 5], while others did not [2, 3].
In order to further investigate the extensional steady state viscosity of polymer melts, we carefully synthesized two
monodisperse polystyrenes with molar masses of 248 and 484 kg/mole. The start-up and steady uniaxial
elongational viscosity have been measured for the two melts using a filament stretching rheometer. We then
compared the measurements with the bi-disperse polystyrene melts made from the above two polymers. The
influence and sensitivity of impurities were studied by adding different percentages of 484k into 248k polystyrene
melt. Furthermore a polydisperse polystyrene with weight average molecular weight 230 kg/mole was also
measured for comparison. Possible reasons for the differences shown in the previously mentioned experiments
are discussed.
Original languageEnglish
Publication date2012
StatePublished

Conference

Conference16th International Congress on Rheology
Number16
CountryPortugal
CityLisbon
Period05/08/1210/08/12
Internet addresshttp://www.rheology-esr.net/ICR2012

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