Showing papers by "Kazutoshi Haraguchi published in 2004"
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.
Abstract: 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. The structure of clay dispersion in water was an assembly of clay platelets 300 A in diameter and 10 A thick. The structure factors of the clay dispersions were reduced to a master curve by normalizing with the clay concentration, Cclay, even across its sol−gel transition. On the other hand, the structure factors of the NC gels cannot be represented with a simple addition of the structure factors of the components, but with a sum of Lorentz (L) and squared-Lorentz (SL) functions. It was found that the SL term, indicating the gel inhomogeneities, becomes dominant by increasing Cclay. The chain dynamics of the gels was found to be similar to the conventional PNIPA gels chemically cross-linked with bis-acrylamide.
126 citations
Patent•
04 Aug 2004
TL;DR: In this paper, an epoxy resin composition is defined, which essentially consists of a polyamine compound having at least one amino group or imino group in the molecule and a boric acid compound represented by the following general formula (1): B(OR)n(OH)3-n (wherein n is an integer of 0-3; R represents an alkyl group expressed as CmH2m+1; and m is a integer of 1-10).
Abstract: Disclosed is an epoxy resin composition which essentially contains an epoxy resin having two or more epoxy groups in the molecule and, as a curing agent for the epoxy resin, a polyamine borate obtained from a polyamine compound (A) having at least one amino group or imino group in the molecule and a boric acid compound (B) represented by the following general formula (1): B(OR)n(OH)3-n (wherein n is an integer of 0-3; R represents an alkyl group expressed as CmH2m+1; and m is an integer of 1-10).
5 citations