Block-copolymers with Polyphenyl-α-Naphtylsilane Fragments in Dimethylsiloxane Chain

Abstract The Wurtz-type reductive-coupling reaction of dichlorophenyl-α-naphtylsilanes was carried out both in the presence of metalic sodium in toluene solution and in a mixture of toluene and o-xylene (at 1:1 ratio) in the presence of sodium and catalytic amount of mercury. Oligomers of α,ω-dichlorophenyl-α-naphtylsilane with various degrees of polymerization were obtained. By hydrolysis of α,ω-dichlorophenyl-α-naphtylsilane the corresponding α,ω-dihydroxydiorganosilanes has been obtained. The heterofunctional condensation of α,ω-dichloro(dihydroxy)phenyl-α-naphtylsilanes with α,ω-dihydroxy(dichloro)dimethylsiloxanes in the presence of acceptor pyridine has been carried out and polysilane-siloxane block-copolymers were obtained. Depending on the lengths of the rigid and flexible initial oligomers microdomain structure of block-copolymers were observed. The synthesized block-copolymers were characterized by gel permeation chromatography, differential scanning calorimetry and X-ray methods.