SYNOPSISFunctional polysiloxanes bearing both primary alcohols and quaternary ammonium salts (QAS) as lateral substituents were prepared. The synthesis involves a cohydrosilylation of allylic derivatives (N,N-dimethylallylamine and allyloxytrimethylsilane) with various poly(dimethylsiloxane-co-hydrogenomethylsi1oxane)s. During the quaternization of the tertiary amino groups the alcohol functions are also deprotected. The hydroxyl groups allow the polysiloxane to be incorporated in polyurethane films whereas the QAS impart biocidal properties to the coating. In the case of a QAS bearing a hexadecyl substituent, a very high activity was found against Escherichia coli without any observable diffusion. The mode of action by contact between the solid polymer and the microorganisms was confirmed by the excellent durability of the biocidal power after 1 month of immersion in water.

SYNOPSISHydroxytelechelic polybutadienes carrying covalently bound quaternary ammonium salts were successfully synthesized in three steps. The first one was the preparation of 1-(N,Ndimethylaminopropyl) 1,1,3,3-tetramethyldisiloxane (MLA) by hydrosilylation. The addition occurred mainly in the terminal position of the double bond, but isomers were formed in small proportion ( a n isomer resulting from an inverse addition and an isomer resulting from a n isomerization of the double bond). The proportion of these isomers increased with the concentration of catalyst ( HzPtCls). Similar results were obtained with a Pt ( 0 ) -divinyltetramethyldisiloxane complex (Pt,DVDS) . The second step was the grafting of M;A onto the 1,2-units of a hydroxytelechelic polybutadiene by hydrosilylation. The yield of the reaction was higher than 90% and the OH functionality decreased slightly. Here again, different platinum catalysts were compared initial rates were higher with Pt,DVDS, but the final yields were better with HzPtCls. The last step was the quaternization of the pendant tertiary amino groups in methanol with alkyl bromides from COH17Br to CI6&Br. The yield of the reaction was higher than 90% and the OH functionality was not modified.

Hydrosilylation catalyzed by hexachloroplatinic acid was used to introduce tertiary amino groups in an hydroxytelechelic polybutadiene. Kinetics and mechanisms were investigated. At low silane concentration, the reaction is first‐order in Pt, second‐order in silane and zero‐order in vinylic double bonds. The apparent rate constant is inversely proportional to the concentration of amino groups (inhibitory effect). At high silane concentration, very sharp acceleration periods are observed and explained by a transformation of a weakly active Pt(II) catalyst into a more active Pt(O) compound.