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SYNOPSISTwo series of segmented polyurethanes based on 3 /2 / 1 and 21 1 / 1 molar ratios of methylene diphenyldiisocyanate (MDI) , N,N-bis (2-hydroxyethyl) isonicotinamide (BIN ) , and poly(tetramethy1ene oxide) (PTMO, MW = 1000) were synthesized and blended with different metal acetates. The thermal behavior and mechanical properties of the pyridinecontaining polyurethane precursors and their blends were characterized by DSC, DMTA, and tensile testing. The results suggest that coordination between pyridine groups in the hard segments and the metal ions in the acetates improves hard-domain cohesion and phase separation and, subsequently, has an effect on mechanical properties. The varying ability of the pyridine group to coordinate with different cations results in different extents of phase separation. The interaction of pyridine with Ni or Cu(I1) is much stronger than with Zn. It is shown that coordination interactions can be a driving force for phase separation and hard-domain aggregation in multiblock copolymer systems. T w o different morphologies are proposed for polyurethanes of differing stoichiometry to explain the differences in the results from DMTA and tensile testing.

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Protein denaturation, common in hydrophobic adsorption systems, causes misinterpretation of adsorption mechanisms, interferes with analysis in analytical chro matograph-v, and

The tristimulus values (X, Y, Z) of the color need to be faithfully matched when a specified color is to be reproduced on the display. In RGB color system, there is only one solution, but in multi‐primary‐color system, there will be numerous combinations due to the color redundancy. In this paper, a 5.5‐inch 6‐primary‐color module was made with resolution of FHD (1920 x 1080) and a color conversion model was established to solve the problem of color reproduction redundancy.