Are Entangled Polymer Melts Different From Solutions?

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

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Are Entangled Polymer Melts Different From Solutions?. / Huang, Qian; Mednova, Olga; Rasmussen, Henrik K.; Skov, Anne Ladegaard; Almdal, Kristoffer; Hassager, Ole.

2012. Abstract from 16th International Congress on Rheology, Lisbon, Portugal.

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

Harvard

Huang, Q, Mednova, O, Rasmussen, HK, Skov, AL, Almdal, K & Hassager, O 2012, 'Are Entangled Polymer Melts Different From Solutions?' 16th International Congress on Rheology, Lisbon, Portugal, 05/08/12 - 10/08/12,

APA

CBE

Huang Q, Mednova O, Rasmussen HK, Skov AL, Almdal K, Hassager O. 2012. Are Entangled Polymer Melts Different From Solutions?. Abstract from 16th International Congress on Rheology, Lisbon, Portugal.

MLA

Vancouver

Huang Q, Mednova O, Rasmussen HK, Skov AL, Almdal K, Hassager O. Are Entangled Polymer Melts Different From Solutions?. 2012. Abstract from 16th International Congress on Rheology, Lisbon, Portugal.

Author

Huang, Qian; Mednova, Olga; Rasmussen, Henrik K.; Skov, Anne Ladegaard; Almdal, Kristoffer; Hassager, Ole / Are Entangled Polymer Melts Different From Solutions?.

2012. Abstract from 16th International Congress on Rheology, Lisbon, Portugal.

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

Bibtex

@misc{36ed5d0e0f3e40e38a078c2718771811,
title = "Are Entangled Polymer Melts Different From Solutions?",
author = "Qian Huang and Olga Mednova and Rasmussen, {Henrik K.} and Skov, {Anne Ladegaard} and Kristoffer Almdal and Ole Hassager",
note = "Oral Presentation.",
year = "2012",
type = "ConferencePaper <importModel: ConferenceImportModel>",

}

RIS

TY - ABST

T1 - Are Entangled Polymer Melts Different From Solutions?

A1 - Huang,Qian

A1 - Mednova,Olga

A1 - Rasmussen,Henrik K.

A1 - Skov,Anne Ladegaard

A1 - Almdal,Kristoffer

A1 - Hassager,Ole

AU - Huang,Qian

AU - Mednova,Olga

AU - Rasmussen,Henrik K.

AU - Skov,Anne Ladegaard

AU - Almdal,Kristoffer

AU - Hassager,Ole

PY - 2012

Y1 - 2012

N2 - The possible existence of a qualitative difference on extensional steady state viscosity between polymer melts <br/>and polymer solutions is still an open question. Recent experiments [1-4] showed the extensional viscosity of both <br/>polymer melts and solutions decayed as a function of strain rate with an exponent of -0.5. When the strain rate <br/>became higher than the order of inverse Rouse time, the polymer solutions showed an upturn [1, 4]. However, in <br/>the same regime for polymer melts, the experiments were contrary: some of the experiments showed an upturn <br/>[4, 5], while others did not [2, 3]. <br/>In order to further investigate the extensional steady state viscosity of polymer melts, we carefully synthesized two <br/>monodisperse polystyrenes with molar masses of 248 and 484 kg/mole. The start-up and steady uniaxial <br/>elongational viscosity have been measured for the two melts using a filament stretching rheometer. We then <br/>compared the measurements with the bi-disperse polystyrene melts made from the above two polymers. The <br/>influence and sensitivity of impurities were studied by adding different percentages of 484k into 248k polystyrene <br/>melt. Furthermore a polydisperse polystyrene with weight average molecular weight 230 kg/mole was also <br/>measured for comparison. Possible reasons for the differences shown in the previously mentioned experiments <br/>are discussed.

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

ER -