Satoshi Okabe

Abstract: The dynamic aspect of double network (DN) gels showing an extremely high mechanical strength has been investigated by dynamic light scattering (DLS) measurements The DN gels are formed from highly cross-linked poly(2-acrylamido-2-methylpropanesulfonic acid) (PAMPS) as the first network and loosely cross-linked (or non-cross-linked) polyacrylamide (PAAm) as the second network The results of DLS show that the presence of slow mode besides the gel mode (fast mode) enhances the strength of DN gels at the low cross-linking density of the second network The dynamics of the slow mode cannot be explained in terms of reptational motion of the second component in the first network, but it is similar to the translational motion of PAAm polymers in a semidilute solution A strong velocity dependence of the mechanical strength is observed at a shear rate close to the inverse of the relaxation time of the slow mode These results suggest that large “voids” of the first network may exist, and PAAm polymers that exist

TL;DR: The structure and dynamics of poly(N-isopropylacrylamide) (PNIPA)−clay nanocomposite (NC) gels have been investigated by small-angle neutron scattering and dynamic light scattering in order to account for their high strength and high deformability as mentioned in this paper.

TL;DR: In this paper, the structure and deformation mechanism of nanocomposite (NC) gels have been investigated by small-angle neutron scattering (SANS), and two-dimensional SANS intensity patterns were obtained for deformed NC4 gels with the stretching ratio up to 6 times.

TL;DR: In this article, the authors showed that the observed change in viscosity was due to the formation of a macrolattice with body-centered-cubic symmetry of spherical micelles in aqueous solution.

TL;DR: In this article, the dynamic light scattering and small-angle neutron scattering investigations were carried out on aqueous solutions of block (Block) and gradient copolymers (Grad) comprising EOVE and MOVE.