Small-Angle Neutron Scattering Studies on the Phase Behavior of Binary Polymer Blends Driven by Photoisomerization

1998 ◽  
Vol 31 (22) ◽  
pp. 7962-7965 ◽  
Author(s):  
Osamu Urakawa ◽  
Okimichi Yano ◽  
Qui Tran-Cong ◽  
Alan I. Nakatani ◽  
Charles C. Han
Keyword(s):  
Neutron Scattering ◽  
Polymer Blends ◽  
Phase Behavior ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Binary Polymer

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.

The structure of high-performance polymer blends by small-angle neutron scattering

1997 ◽  
Vol 234-236 ◽  
pp. 240-241 ◽  
Author(s):  
J. Caspar ◽  
B. Dünges ◽  
R.G. Kirste ◽  
T. Heitz ◽  
A. Wiedenmann
Keyword(s):  
Neutron Scattering ◽  
Polymer Blends ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
High Performance ◽  
High Performance Polymer

Characterization of Micron-Sized Periodic Structures in Multicomponent Polymer Blends by Ultra-Small-Angle Neutron Scattering and Optical Microscopy

2008 ◽  
Vol 41 (2) ◽  
pp. 471-477 ◽  
Author(s):  
Nisita S. Wanakule ◽  
Alisyn J. Nedoma ◽  
Megan L. Robertson ◽  
Zhuangxi Fang ◽  
Andrew Jackson ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Polymer Blends ◽  
Optical Microscopy ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Periodic Structures ◽  
Multicomponent Polymer

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
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