Small-angle neutron scattering studies of compatible blends of linear poly(vinyl methyl ether) and cross-linked deuterated polystyrene

1989 ◽  
Vol 22 (2) ◽  
pp. 940-948 ◽  
Author(s):  
Barry J. Bauer ◽  
Robert M. Briber ◽  
Charles C. Han
Keyword(s):  
Neutron Scattering ◽  
Methyl Ether ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Vinyl Methyl ◽  
Vinyl Methyl Ether ◽  
Linear Poly

Three-dimensional small-angle neutron scattering of shear-induced phase separation in a dynamically asymmetric polymer mixture

2006 ◽  
Vol 39 (6) ◽  
pp. 878-888 ◽  
Author(s):  
Satoshi Koizumi ◽  
Jun-ichi Suzuki
Keyword(s):  
Phase Separation ◽  
Neutron Scattering ◽  
Temperature Region ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Three Dimensional ◽  
Shear Velocity ◽  
Intermediate Temperature ◽  
Polymer Mixture ◽  
Vinyl Methyl Ether

A polymer mixture of polystyrene (PS)/poly(vinyl methyl ether) (PVME) has been investigated by using a three-dimensional small-angle neutron scattering (3D-SANS) method. PS and PVME exhibit a large difference in the glass transition temperatureTg. Therefore, dynamical asymmetry is strongly enhanced in an intermediate temperature region between theTgvalues of neat PS and PVME. In the intermediate temperature region, a shear deformation was imposed on the polymer mixture to enhance the concentration fluctuations,i.e.shear-induced phase separation. By rotating the film specimen, which was rapidly quenched after deformation, 3D-SANS due to shear-induced phase separation was observed successfully. In theqx=qyplane of the sample coordinate system, whereqis a component of scattering vectorq, it was possible to observe SANS of `double-lobe' shape, with the minor axes of the lobes inclined towardsqx=qy, whereqx,qyandqz, denote the shear, velocity gradient and vorticity directions in reciprocal space, respectively. Abnormal `butterfly' scattering was observed in a section cut through the 3D-SANS in theqxqzplane. The 3D-SANS thus obtained is discussed in comparison with a model of dynamical coupling between stress and diffusion.

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