Stress relaxation of entangled polystyrene solution after constant-rate, uniaxial elongation

Yumi Matsumiya, Yuichi Masubuchi, Hiroshi Watanabe, Qian Huang, Henrik K. Rasmussen, Nicolas Javier Alvarez, Ole Hassager

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

Abstract

For an entangled solution of linear polystyrene (PS 545k; M = 545k) in dibutyl phthalate (DBP), the stress relaxation after constant-rate uniaxial elongation was examined with an extensional viscosity fixture mounted on ARES (TA Instruments). The PS concentration, c = 52 wt%, was chosen in a way that the entanglement density M/Me of the solution coincided with that of PS 290k melt (M = 290k). After the elongation at the Rouse-based Weissenberg number Wi(R) ~ 3 up to the Hencky strain of 3, the short time stress relaxation of the solution was accelerated by a factor of ~4, which was less significant compared to the acceleration (by a factor of ~ 10) noted for PS melt under a similar condition. This result, being in harmony with the mild acceleration found for a 52 wt% blend of PS 545k with
an oligomeric styrene (M = 1k), suggested that the segmental friction is reduced when the chain is highly stretched and oriented but this reduction weakens on an increase of the concentration of un-stretchable solvent molecules. This change of the stretch/orientation reduction of the friction with the solvent concentration appears to be consistent with the monotonic thinning of the steady-state elongational viscosity seen for melts and the lack of monotonic thinning observed for the semidilute solutions. Results for less concentrated solutions will be also presented on site.
Original languageEnglish
Publication date2013
Publication statusPublished - 2013
Event85th Annual Meeting of The Society of Rheology - Montreal, Que., Canada
Duration: 13 Oct 201317 Oct 2013
Conference number: 85
http://www.rheology.org/sor/annual_meeting/2013Oct/

Conference

Conference85th Annual Meeting of The Society of Rheology
Number85
CountryCanada
CityMontreal, Que.
Period13/10/201317/10/2013
Internet address

Bibliographical note

[CONFERENCE ABSTRACT]
Stress relaxation of entangled polystyrene solution after constant-rate, uniaxial elongation

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