Small-angle neutron scattering studies on phase behavior of block copolymers

1999 ◽  
Vol 60 (8-9) ◽  
pp. 1307-1312 ◽  
Author(s):  
H Hasegawa ◽  
N Sakamoto ◽  
H Takeno ◽  
H Jinnai ◽  
T Hashimoto ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Neutron Scattering ◽  
Phase Behavior ◽  
Small Angle ◽  
Small Angle Neutron Scattering

Small-Angle Neutron Scattering Studies of the Phase Behavior and Mesophases of Homopolymers, Block Copolymers and Complex Mixtures

1997 ◽  
Vol 30 (5) ◽  
pp. 702-707 ◽  
Author(s):  
K. Mortensen ◽  
K. Almdal ◽  
D. Schwahn ◽  
F. S. Bates
Keyword(s):  
Block Copolymers ◽  
Neutron Scattering ◽  
Phase Behavior ◽  
Critical Behavior ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Diblock Copolymers ◽  
Polymer Complex ◽  
X Rays ◽  
Lifshitz Point

Small-angle scattering of X-rays and neutrons are particularly powerful techniques for studying complex materials such as polymers, micellar solutions and lyotropic mesophases of amphiphilic molecules. In the present paper, we review some of the recent progress on polymer complex fluids made using small-angle neutron scattering. These studies include examination of the phase behavior of binary polymers where fluctuations due to the free volume significantly renormalize the critical behavior. Block copolymers phase-separate on the microscopic level given by the length scale of the polymer coils and form a variety of mesoscopic ordered phases. Blends of homopolymers and diblock copolymers show new physical phenomena where different critical behavior meets in a Lifshitz point. Block copolymers in selected solutions self-assemble into micellar structures which provide the basis for ordered structures.

Small-angle neutron scattering by two-component particles: Application to block copolymers

1981 ◽  
Vol 19 (7) ◽  
pp. 1019-1031 ◽  
Author(s):  
L. Ionescu ◽  
C. Picot ◽  
M. Duval ◽  
R. Duplessix ◽  
H. Benoit ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Two Component

Shear Induced Phase Behavior of Polymer Blends by Small Angle Neutron Scattering

1989 ◽  
Vol 166 ◽  
Author(s):  
Alan I. Nakatani ◽  
Hongdoo Kim ◽  
Charles C. Han
Keyword(s):  
Neutron Scattering ◽  
Polymer Blends ◽  
Phase Behavior ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Large Body ◽  
Concentric Cylinder ◽  
Shear Rates ◽  
Lower Shear ◽  
High Shear Rates

ABSTRACTThe phase behavior of polymer blends and solutions can be changed dramatically by a flow field using a variety of flow geometries. Unlike simple binary fluids which require extremely high shear rates to produce only small shifts in the phase boundary, polymer phase behavior may be influenced by as much as 10 degrees with the application of much lower shear rates. However, there is a large body of conflicting data concerning the nature of these shear effects in polymers.Here we report on the effects of shear on the phase behavior of polymer blends by small angle neutron scattering (SANS). Experiments were conducted using a specially constructed, concentric cylinder apparatus for in situ studies of concentrated polymer solutions and melts. Two separate systems will be discussed: 1) a blend of polystyrene and polybutadiene. 2) a blend of polystyrene and poly(vinylmethylether). Both systems exhibit shifts in the phase behavior which indicate shear induced mixing in agreement with previous results obtained by other techniques. These results will be interpreted within the context of existing theories of shear induced phase behavior.

Small-Angle Neutron Scattering from Nonuniformly Labeled Block Copolymers

2004 ◽  
Vol 37 (5) ◽  
pp. 1960-1968 ◽  
Author(s):  
Megan L. Ruegg ◽  
Maurice C. Newstein ◽  
Nitash P. Balsara ◽  
Benedict J. Reynolds
Keyword(s):  
Block Copolymers ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering
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