Temperature and Shear Rate Dependence of Small Angle Neutron Scattering from Semidilute Polymer Solutions

1999 ◽  
Vol 32 (21) ◽  
pp. 7208-7223 ◽  
Author(s):  
I. Morfin ◽  
P. Lindner ◽  
F. Boué
Keyword(s):  
Shear Rate ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Polymer Solutions ◽  
Rate Dependence ◽  
Shear Rate Dependence

Observations on concentrated polymer solutions near the Θ condition using small-angle neutron scattering

1990 ◽  
Vol 23 (25) ◽  
pp. 5270-5273 ◽  
Author(s):  
Erik Geissler ◽  
Simon Mallam ◽  
Anne Marie Hecht ◽  
Adrian R. Rennie ◽  
Ferenc Horkay
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Polymer Solutions

Effects of Shear on the Structures in a System of Small Rodlike Micelles

1994 ◽  
Vol 376 ◽  
Author(s):  
Paul D. Butler ◽  
L.J. Magid ◽  
William A. Hamilton ◽  
P.J. Kreke ◽  
Johnb. Hayter
Keyword(s):  
Shear Rate ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Supporting Electrolyte ◽  
Type Ii ◽  
Spherical Micelles ◽  
Shear Induced Structure ◽  
Induced Structure

ABSTRACTWe have used small angle neutron scattering (SANS) to study solutions of cetyltrimethylammonium 2,6-dichlorobenzoate (2,6) at rest and as a function of shear. These solutions are Newtonian, and up to a concentration of at least 100mM contain spherical micelles. Comparison with viscoelastic solutions of the closely related, and much studied, cetyltrimethylammonium 3,5-dichlorobenzoate (3,5) is made. While spheres are not expected to align under shear, a shear induced sphere to rod transition has been postulated for this system. In the results presented here, no shear induced sphere to rod transition was observed even at the highest accessible shear rate. Addition of sufficient supporting electrolyte (up to 1M NaCl) does cause such a transition in the quiescent solution. Hoffmann et al. have seen what they refer to as the formation of a shear induced structure (SIS or type II micelles) on similar systems where short rods form in the absence of supporting electrolyte. Shearing of the salted system produces rapid though not spectacular alignment, with no evidence of a SIS forming.

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