The effect of unidirectional shear on the structure of triblock copolymers. I. Polystyrene-polybutadiene-polystyrene

Flow severely affects the morphological and rheological properties of microphase-separated block copolymers as shown with a polystyrene--polybutadiene--polystyrene triblock copolymer. Small-angle X-ray scattering (SAXS) and form birefringence show that cylindrical polystyrene domains orient in the f...

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Published in:Macromolecules 1989-09, Vol.22 (9), p.3533-3540
Main Authors: Morrison, Faith A, Winter, H. Henning
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Language:English
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Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Rheology and viscoelasticity
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Winter, H. Henning
description Flow severely affects the morphological and rheological properties of microphase-separated block copolymers as shown with a polystyrene--polybutadiene--polystyrene triblock copolymer. Small-angle X-ray scattering (SAXS) and form birefringence show that cylindrical polystyrene domains orient in the flow direction reaching a saturated orientation after approx 30 shear units in a constant-stress experiment. The size and shape of the domains are unaffected by the flow as measured by SAXS and transmission electron microscopy (TEM). Shift factors a sub T used to obtain master curves from small-strain dynamic measurements also do not change with shear. The master curves of samples sheared at 160 deg C first drop at all frequencies, omega , with increasing strain and then recover at high omega for the highest strains. Samples sheared at 180 deg C behave similarly but recover completely to the initial rheological state even though the domains in the samples are highly oriented. A flow mechanism is proposed to describe these results. Graphs. 18 ref.--AA
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subjects Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Rheology and viscoelasticity
title The effect of unidirectional shear on the structure of triblock copolymers. I. Polystyrene-polybutadiene-polystyrene
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