Epoxy-functional siloxane

In a first step the epoxy-functionalized siloxanes were prepared by hydrosilylation, with allyl glycidyl ether and Lamoreaux catalyst (Pt catalyst resulting from HjPtClg.H O in octanol), at 130-145°C for 4-lOh. The reaction is quantitative. 

Chem. Descrip. Reactive epoxy-functional siloxane oligomer in water Uses Adhesion promoter between inorg. materials (glass, minerals, metals) and org. polymers (thermosets, thermoplastics, elastomers) surface treatment aid for mins. reinforcement aid for glass fibers primer for glass and metals surface modifier for org. materials additive for water-borne polymers... 

The conversion of epoxy functional siloxanes with tertiary amines in the presence of acids leads to quaternary ammonium groups (Fig. 8) [16]. If a secondary amine is used instead, a subsequent step with monochloroacetic acid sodium salt gives a betaine [17]. Anionic surfactants can be generated by treating the epoxy with NaFfSOs [18]. Analog products are available with Bunte salts [19]. 

FIG. 8 Synthesis of ionic silicone surfactants from epoxy functional siloxanes. 

The choice of reactions to be carried out in the presence of hydrophobic material-supported platinum catalysts was based on the practical importance of reaction products. Epoxy functional silanes are among the most important adhesion promoters applied to create bonds between filler and polymer matrix, thus improving physicochemical and strength parameters of composites. Of practical importance are also epoxy functional siloxanes that are applied to the modification of epoxy resins, thus making them more flexible, less susceptible to water sorption, and more resistant to heat. Moreover, epoxy functional siloxanes find application to the manufacture of ionic silicone surfactants. 

The aim of this work was to examine the catalytic activity of rhodium siloxide complexes in the hydrosilylation of allyl glycidyl ether by triethoxysilane and hydro(poly)siloxanes, leading to optimization of procedures for the synthesis of epoxy-functional silanes and siloxanes. 

On the basis of the obtained results, the technologies of synthesis of epoxy-functional silane and (poly)siloxanes have been worked out and will be implemented in the very near future. 

Functional siloxane oligomers bearing either epoxy, aminopropyl, hydroxy piperazine or piperazine endgroups were... 

Platinum-catalysed reaction of olefin epoxides to SiH compounds, or hydrosilation, is an elegant and convenient means of sythesizing epoxy-functional silicones and siloxanes (1). The basic reaction is presented as equation 1 ... 

FIG. 9 Reaction of A -methylglucamine and an epoxy functional polyether siloxane copolymer. 

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