Synthesis Of Organosilicon Polymers Research Articles

Synthesis of organosilicon polymers with cyclohexasilane fragments in the main chain

Permethylated cyclolinear polysilanes and polyoxasilanes were synthesized by the reaction of 1,3- and 1,4-dichlorodecamethylcyclohexasilanes with metallic sodium (the Wurtz-type reaction) and cis-1,3-dihydroxydecamethylcyclohexasilane (heterofunctional polycondensation reaction). Thermal and thermooxidative stability, as well as spectroscopic properties of the polymers obtained and products of their thermal decomposition were studied.

Reaction of dioxides derived from organosilicon thiocarbamides with ammonia and methylamine

Reactions of organosilicon thiocarbamide dioxides {[R3Si(CH2)3NH]2CSO2, R = Et (I), O1.5 (II)} with methylamine and ammonia were studied. The reaction of compound I with ammonia involves, along with the substitution of the NHC(SO2)NH fragment by a guanidine residue, Si-C bond cleavage to form an oligomer comprising [O(Et)Si(CH2)3NH]2C=NH and [O1.5Si(CH2)3NH]2C=NH elementary units. The reactions of compound II with methylamine and ammonia resulted in the synthesis of organosilicon polymers containing guanidine groups. These polymers exhibit a high sorption capacity toward Ag(I).

Synthesis of organosilicon polymers containing donor–acceptor type π-conjugated units and their applications to dye-sensitized solar cells

Novel organosilicon polymers having donor–acceptor type π-conjugated units in the backbone were prepared by Stille-coupling reactions of bis(tributylstannylthienyl)silanes with diiodoquinoxialine, benzothiadiazole, and benzothiaselenazole. Dehaloganative copolymerization of di(bromothienyl)silanes and dibromoquinoxaline was also studied, which gave the corresponding random copolymer. Applications of these polymers to dye-sensitized solar cells (DSSCs) were examined and it was found that the polymer containing benzoselenadiazole units as the acceptor exhibited the best performance as the sensitizer among the present polymers.

Synthesis of organosilicon polymers by using the Lewis-acid-catalyzed trans-allylsilylation of alkynes

The HfCl 4 catalyzed polymerization of allyl(4-ethynylphenyl)dimethylsilane ( 1a ) proceeded smoothly to give poly[dimethyl-(1,4-pentadienyl)phenylsilane] ( 2a ), and the HfCl 4 catalyzed reaction of 1-allyl-2-(4-ethynyphenyl)-1,1,2,2-tetramethyldisilane ( 1b ) afforded poly[1,1,2,2-tetramethyl-1-(1,4-pentadienyl)-2-phenyldisilane] ( 2b ). These polymerization reactions proceeded via the stereoselective trans-allylsilylation of the 4-ethynyl group attached to the aromatic ring.

Non-traditional Method of Synthesis of Organosilicon Polymers

The combined polymerization-condensation process-the non-traditional method of synthesis of siliconorganic polymers with organo-inorganic and inorganic main chains of macromolecules is reviewed.

Synthesis of organosilicon polymers—I. Silicone and silicon carbide copolymers: synthesis and physical properties

This work relates to a novel silicone and silicon carbide copolymer prepared by copolymerizing a cyclic or polycyclic non-conjugated diene with polysiloxane or dihydrosilyl hydrocarbon through the so-called hydrosilation. Norbornadiene, 5-vinyl-[2,2, 1]bicyclohept-2 ene and 4-vinylcyclohexene have been copolymerized with 1,1,3,3-tetramethyldisiloxane and 1,4-bis(dimethylsilyl)benzene. The polymers are stable thermally up to 440°.

A novel synthesis of organosilicon polymers with reactive vinyl groups

A novel synthesis of organosilicon polymers with reactive vinyl groups