Interpretation of small angle neutron scattering by copolymer solutions as a function of concentration

Small angle neutron scattering at the National Institute of Standards and Technology

“…In the case of block copolymers, the off-diagonal elements of the bare structure factors matrix X 0 ( Q ) are non-zero and represent cross correlations between different blocks. These results were derived by Benoit and coworkers [ 31 ]. Sakurai et al [ 32 ] used a similar approach to sort out the effects of microstructure and deuterium labeling in random copolymers of 3,4 polyisoprene (hPI) with 1,4 hPI in 1,2 dPB with 1,4 dPB (copolymer A-B in copolymer C-D).…”

“…This RPA result for the structure factors is an extension [ 30 , 31 ] of Eq. (2) in which the solvent volume fraction ϕ s is replaced by ϕ B S 0BB ( Q ).…”

Dynamics of copolymer solutions determined by using neutron spin-echo

“…If one writes the expansion of > and rI|C introducing the translation diffusion coefficient D0 = kT/N f, one obtains , -Q2D0 1 + q2 .R GT (8) i,c…”

Microphase separation transition of weakly charged copolymers in solution

“…The second term on the rhs of eq 9 is the structure factor one would measure if the increments of the refractive indices of the two blocks are equal but have opposite signs. [8][9][10][11][12][13][14][15][16] In this so-called optical condition or zero average contrast condition, one has 4S,(q) P1/2(q)-P(q) -* =--(Ha) l-|0AT[P1/2(q)-PT(q)] Si(q) represents the static correlations of composition fluctuations, namely if pi(q) is the quantity…”