Numerical study of microphase separation in gels and random media

2004 ◽  
Vol 328 (2-3) ◽  
pp. 201-206
Author(s):  
Nariya Uchida
Keyword(s):  
Random Media ◽  
Microphase Separation ◽  
Numerical Study

A numerical study of rays in random media

1973 ◽  
Vol 28 (1) ◽  
pp. 223-238 ◽  
Author(s):  
M. Y. Youakim ◽  
C. H. Liu ◽  
K. C. Yeh
Keyword(s):  
Random Media ◽  
Numerical Study

Numerical study of magnetic flux lines in random media

1992 ◽  
Vol 169 (4) ◽  
pp. 287-292 ◽  
Author(s):  
Yoshihisa Enomoto ◽  
Ken-ichi Katsumi
Keyword(s):  
Magnetic Flux ◽  
Random Media ◽  
Numerical Study ◽  
Flux Lines ◽  
Magnetic Flux Lines

Total reflection of a plane wave by a semi-infinite random medium

1972 ◽  
Vol 8 (2) ◽  
pp. 217-229 ◽  
Author(s):  
P. L. Sulem ◽  
U. Frisch
Keyword(s):  
Wave Propagation ◽  
Reflection Coefficient ◽  
Plane Wave ◽  
Random Media ◽  
Numerical Study ◽  
Random Medium ◽  
Exact Result ◽  
Total Reflection ◽  
One Dimensional ◽  
The Mean

An exact result in the theory of wave propagation in random media is presented. Using the ergodic theory of dynamical systems, it is shown that a semi-infinite, one-dimensional random medium is totally reflecting. A direct numerical study shows that the mean reflection coefficient converges exponentially to one.

Morphological studies of linear (AB)n multiblock copolymers and their blends

1992 ◽  
Vol 50 (1) ◽  
pp. 384-385
Author(s):  
Richard J. Spontak ◽  
Steven D. Smith ◽  
Arman Ashraf
Keyword(s):  
Electron Microscopy ◽  
Microphase Separation ◽  
Multiblock Copolymers ◽  
First Order ◽  
Morphological Studies ◽  
Transmission Electron ◽  
First Order Phase Transition ◽  
Covalently Bonded ◽  
Total Molecular Weight ◽  
First Order Phase

Block copolymers are composed of sequences of dissimilar chemical moieties covalently bonded together. If the block lengths of each component are sufficiently long and the blocks are thermodynamically incompatible, these materials are capable of undergoing microphase separation, a weak first-order phase transition which results in the formation of an ordered microstructural network. Most efforts designed to elucidate the phase and configurational behavior in these copolymers have focused on the simple AB and ABA designs. Few studies have thus far targeted the perfectly-alternating multiblock (AB)n architecture. In this work, two series of neat (AB)n copolymers have been synthesized from styrene and isoprene monomers at a composition of 50 wt% polystyrene (PS). In Set I, the total molecular weight is held constant while the number of AB block pairs (n) is increased from one to four (which results in shorter blocks). Set II consists of materials in which the block lengths are held constant and n is varied again from one to four (which results in longer chains). Transmission electron microscopy (TEM) has been employed here to investigate the morphologies and phase behavior of these materials and their blends.

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