], did not indicate clearly whether the amine competed

Several siloxane polymers bearing amino or imino functional groups were pre­ pared and applied to unsized E-glass fibers, in order to investigate how such func­ tional groups interacted with glass surfaces. An imino functionalized siloxane based on a poly(dimethylsiloxane-co-methylhydrogensiloxane) polymer, with an average of 4 imino groups per molecule was prepared. Both amino 1 and amino 2 samples are aminopropyl-terminated poly(dimethylsiloxane) polymers o f differ­ ent molecular weights (amino 1 D.P. = 19; amino 2 D.P. = 836). Sample amino 3 is a pendant aminopropyl functionalized siloxane, with an average o f 4 pendant amino groups per molecule. For the imino functionalized siloxane was prepared by reaction of amino 3 with a ketone.