Electrophoretic mobilities and viscosities of poly (sodium acrylate) of different molecular weight were measured over pH range 4 to 10 in buffer solution systems of CH3COOHCH3COONa, Na2HPO4-KH2PO4 and Na2CO3-NaHCO3 at 0.2 ionic strength. The intrinsic mobilities (Uc→o) obtained at zero polymer concentration were independent of molecular weight in this pH range, and its relation was, particularly, held also in oligomer range (3.67×103mol.wt.) too. The relationship between [η] and Mn was [η] =7.9×10-5 Mn0.75 and [η] =1.6×10-4 Mn0.80 at pH 4 and 7, respectively, and at θ point it was also estimated from Fixman-plots of [η] vs Mn. On the other hand, it was observed that, on constant molecular weight, [η] ~ pH curve was analogous to Uco~pH curve, and the plots of [η] vs Uc→o were a straight line.
Usually light emitting diodes are molded by resins, and these must have some good characteristics, for processing, adhering, and transperency. Furthermore, the resins should scatter lights efficiently in some case. These light scattering resins can be made by dispersing small particles into themselves. However, the optimum condition for dispersing, particle sizes, amounts, diffraction indices of particles have not been found yet. To find this optimum condition, the authors dispersed some kinds of particles (Al2O3, Ti02, BaSO4, ZnO) into epoxy resins and measured light scattering intensities for various particles, changing particle amount N. The light scattering theories by small particles show that In I 180 depends on N linearly. The measurements show this linearity, but it begins to break off with increasing N. And, this breaking off point Ni180 depends upon particle size and diffraction index, that the amount Ni180 increase with increasing particle size and decreasing diffractive index. The scattering intensity along ∠ 135°axis shows maximum at Ni135 and this Ni135 is about the same as Ni180. This particle amount at Ni is the optimum condition for light scattering of small particles dispersed resin system. And, this is available for practical use.
Oil-free isophthalic acid resins were prepared from isophthalic acid chloride, trimethylolpropane and 2, 2-dimethyl-1, 3-propanediol by low-temperature polycondensation in chloro-form or 1, 2-dichloroethane. The same resins were also obtained from isophthalic acid and above polyols by melt polycondensation. The obtained oil-free vehicles were examined in the performance characteristics as an alkyd coating according to JIS K 5400. Each of the isophthalic acid vehicles made into a transparent paint film and offered an outstanding resistance to bend, impact, heat, acid and gasoline. The three components resin prepared by low-temperature solution polycondensation was excellent in resistance to water, salt water and alkali in comparison with other resins.