Abstract
The dynamics of order parameter fluctuations has been investigated near
the maximum of the static structure factor for semidilute solutions in a
neutral good solvent of a very high molecular weight diblock copolymer.
The effect of the proximity to the disorder-to-order transition (ODT)
was evident both in the static light scattering intensity and in the
internal relaxation by increasing the copolymer concentration up to
phi(ODT). All extra relaxation was also observed which can be attributed
to curvilinear Rouse motion of the blocks between entanglements inside
their tubes.