Transient Shear And Elongational Data For Polyisobutylene Melts

Below is result for Transient Shear And Elongational Data For Polyisobutylene Melts in PDF format. You can download or read online all document for free, but please respect copyrighted ebooks. This site does not host PDF files, all document are the property of their respective owners.

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 [2]. In the paper by van Nieuwkoop and Muller von Czernicki [1], 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 [8]. 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