| Part I. The conductivities, electron spins, and g values of (MMn(DTO);Part II. Segmented polyurethanes were prepared by reacting of soft polyol with diisocyanate to form a prepolymer then chain extended with a short chain diol to form high polymer. Stoichiometry considerations are critical for the synthesis of high molecular weight polyurethanes. Preliminary purification, drying, and molecualr weight determination of the starting materials and soft segments are extremely important. The segmented polyurethanes phase separated into hard and soft phases which was confirmed by the observation of constant glass transition temperature of each polymer system. None of the polymers showed reproducible melting transition due to the accompanied decomposition. p2BuDOP based polymers were the most acid-sensitive polymers in all five systems we studied.;pAMMO/MDI/pDTM triblock copolymers with 16%, 26%, and 42% hard segment content are excellent elastomers. They showed reproducible melting transitions at maxima of... |
