Calculates the macroscopic scattering intensity for a multi-component homogeneous mixture of polymers using the Random Phase Approximation. This general formalism contains 10 specific cases
Case 0: C/D binary mixture of homopolymers
Case 1: C-D diblock copolymer
Case 2: B/C/D ternary mixture of homopolymers
Case 3: C/C-D mixture of a homopolymer B and a diblock copolymer C-D
Case 4: B-C-D triblock copolymer
Case 5: A/B/C/D quaternary mixture of homopolymers
Case 6: A/B/C-D mixture of two homopolymers A/B and a diblock C-D
Case 7: A/B-C-D mixture of a homopolymer A and a triblock B-C-D
Case 8: A-B/C-D mixture of two diblock copolymers A-B and C-D
Case 9: A-B-C-D tetra-block copolymer
**NB: these case numbers are different from those in the NIST SANS package!**
Only one case can be used at any one time.
The RPA (mean field) formalism only applies only when the multicomponent polymer mixture is in the homogeneous mixed-phase region.
**Component D is assumed to be the "background" component (ie, all contrasts are calculated with respect to component D).** So the scattering contrast for a C/D blend = [SLD(component C) - SLD(component D)]$^2$.
Depending on which case is being used, the number of fitting parameters - the segment lengths (ba, bb, etc) and $\chi$ parameters (Kab, Kac, etc) - vary. The *scale* parameter should be held equal to unity.
The input parameters are the degrees of polymerization, the volume fractions, the specific volumes, and the neutron scattering length densities for each component.
A Z Akcasu, R Klein and B Hammouda, *Macromolecules*, 26 (1993) 4136
|Uploaded||Sept. 15, 2016, 5:27 p.m.|
|Verified||This model has not been verified by a member of the SasView team|
|In Library||This model is not currently included in the SasView library. You must download the files and install it yourself.|
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