Transient Shear And Elongational Data For Polyisobutylene Melts
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Eindhoven University of Technology MASTER Towards the
Eindhoven University of Technology MASTER Towards the rheological characterization of polymer solutions using complex flows van Dam, J.W.A. Award date:
Experimental study on the capillary thinning of entangled
The elongational relaxation time λe has been compared to a mean shear relaxation time defined as follows (Liang and Mackley 1994): ¯λ s = 3giλi gi (3) which is calculated from the relaxation time spectrum which can be obtained from small amplitude oscillatory shear (SAOS) experiments without assuming a specific constitu-tive equation.
Evaluation of constitutive equations for polymer melts and
and computationally, model fluids are used instead of polymer melts in the main part of this study. Most results are obtained fora shear-thinning salution of 5% (w/w) polyisobutylene in tetradecane (referred to with 5% PIB/C14). In case of a low density polyethylene (LDPE) melt, a preliminary analysis is made using the same geometry.
Progress and Trends in Rheology V
Volume/shear interaction in glassy polymers KNAUSS W.G. 21 Rheology of biopolymer gel systems LAPASIN R., PRICL S. 22 Wall slip of polymer melts from squeeze flow and capillary rheometry LAUNH.M. 26 Some problems related to flow of rheokinetic liquids MALKINA.YA. 30 Microstructural changes in structured colloidal dispersions MELLEMAJ., VAN DEN
Measuring the transient extensional rheology of polyethylene
used recently to characterize the transient extensional response of polyethylene melts that are closely related to those we investigate in the present study fBach et al. s2003bdg. In the present work we seek to evaluate the performance of a new test ﬁxture, known as the SER, developed for elongational rheometry by Sentmanat s2003a, 2003bd. The
On the modelling of a PIB PB Boger ﬂuid in extensional ﬂow
In this study, we will focus on a single (Boger) ﬂuid: a dilute solution of polyisobutylene (PIB) in polybutene (PB) and kerosene, the so-called ﬂuid B . In the paper by van Nieuwkoop and Muller von Czernicki , the transient elongational viscosity of this ﬂuid (sample 3) was measured up to a strain of 7.2.
Extensional deformation, stress relaxation and necking
of weakly strain-hardening fluid such as polymer melts and concentrated polymer solutions. However, little experimental data for such materials has been available to date. A detailed experimental and numerical study of the dynamical behavior of shear-thinning and
On the performance of enhanced constitutive models for
optical measurement of the full 3D transient stress tensor by Kalogrianitis and van Egmond . However, this technique works only for homogeneous flows (simple shear in their case). For inhomogeneous flows, two approaches may be adopted. Firstly, for known flow kinematics, the constitutive equations may be integrated along a particle path.
Investigation of the rheological properties of short glass
Rheol Acta (2009) 48:59 72 DOI 10.1007/s00397-008-0309-9 ORIGINAL CONTRIBUTION Investigation of the rheological properties of short glass ﬁber-ﬁlled polypropylene in extensional ﬂow
Rheological characterization of the time and strain
obtained from step-strain data using controlled-strain mechanical spectrometers ]2,8,91. Polyisobutylene, in the form of both pure melts and solutions, has been exten- sively studied, for example, in the field of elongational flow [ 10,111, second normal
Measuring the Transient Extensional Rheology of Polyethylene
the performance of the new test fixture. Transient stress growth experiments are carried out over a range of Hencky strain rates from 0.003 s-1 to 30 s-1 and the data shows excellent agreement with the published material functions. At deformation rates greater than 0.3 s-1 a true steady state extensional viscosity is not