NDLI: Simultaneous stress and birefringence measurements during uniaxial elongation of polystyrene melts with narrow molecular weight distribution

Content Provider	Springer Nature Link
Author	Luap, Clarisse Müller, Christian Schweizer, Thomas Venerus, David C.
Copyright Year	2005
Abstract	Tensile stress and flow-induced birefringence have been measured during uniaxial elongation at a constant strain rate of two polystyrene melts with narrow molecular weight distribution. For both melts, the stress- optical rule (SOR) is found to be fulfilled upto a critical stress of 2.7 MPa, independent of strain rate and temperature. Estimation of the Rouse times of the melts, from both the zero-shear viscosity and the dynamic-shear moduli at high frequency, shows that the violation of the SOR occurs when the strain rate multiplied by the Rouse time of the melt exceeds by approximately 3. The presented results indicate that in contrast to current predictions of molecular theories, the regime of extensional thinning observed by Bach et al. (2003) extends well beyond the onset of failure of the SOR, and therefore the onset of chain stretch in the non-Gaussian regime.
Starting Page	83
Ending Page	91
Page Count	9
File Format	PDF
ISSN	00354511
Journal	Rheologica Acta
Volume Number	45
Issue Number	1
e-ISSN	14351528
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-07-05
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer melt Birefringence Elongational flow Polystyrene Rheo-optics Nonlinear viscoelasticity
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Materials Science

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