With purpose to prepare waterborne polyurethane with improved performance, bis (methyoxyl hydroxyl)-functionalized polysiloxanes with different dimethylsiloxane segment length were prepared. The preparation includes three steps, the first is synthesis of 1,3-bis (glycidoxypropyl) tetramethyldisiloxane (compound Ⅰ) via hydrosilylation of allylglycidyl ether with tetramethyldisiloxane, followed by a subsequent methoxylation of the resultant compound from the hydrosilylation to give 1,3-bis (3-(1-methoxy-2-hydroxypropoxy)propyl) tetramethyldisiloxane (compound Ⅱ). Using this compound II and octamethylcyclotetrasiloxane (D4), an equilibrium reaction was carried out to obtain the target Product Ⅲ, i.e. bis (methoxyl hydroxyl)-functionalized polysiloxanes. The ratio of D4/compound Ⅱ was varied in order to prepare product Ⅲ with different segment length consisting of dimethylsiloxane units. At each step, the outcome compounds were characterized through Infrared, 1H NMR, 13C NMR as well as H-H and H-C Correlated Spectroscopy (COSY). The results showed that each step was successfully carried out and objective products were achieved. It was estimated that compound Ⅱ was not exclusive in the methoxylation step. Characterizations of the compound II enabled us to give a reliable quantitative amount for the by-products for the first time. In addition, the molecular weights of the final product Ⅲ with varying dimethylsiloxane length were estimated by hydroxyl group analysis, 1H NMR and GPC, which showed a good agreement between the theoretical molecular weights and those from these tests.

Poly (methyltetraphenylphenylsilylene-co-1,4-bis(methylphenylsilyl)phenylene)(PSP) were synthesized by the cocondensation reaction of methyltetraphenylphenyldichlorosilane and 1,4-bis (chloromethylphenylsilyl) benzene with sodium in toluene. The optical and conducting properties of the polymer were investigated. Because of the introducing of tetraphenylphenyl groups to the Si atoms of the polymer, the ultraviolet (UV) absorption wavelengths of the PSP red-shift significantly in the UV region, and a strong photoluminescence band can be observed at visible region. Treatment of the films of PSP with 12 vapor afforded conducting films.