Isomeric Silicones: Reactive Phenylsilsesquioxane-Based MT Resins and Comments Concerning the Structure of the Phenylsilsesquioxane Homopolymer

Abstract

Condensation products of trimethylsilanol and phenylsilanetriol (MT ϕ oligomers and polymers) were prepared by both base-and acid-catalyzed hydrolysis and co-condensation of phenyltrimethoxysilane (T monomer) and hexamethyldisiloxane (M dimer). The composition and molecular weight of the products were controlled by varying the M/T feed ratio and reaction conditions, particularly the solvent identity. Vinyldimethyl-M (M V ) and hydridodimethyl-M (M H ) derivatives were prepared analogously for use as resins to form monolithic transparent solids using platinum-catalyzed hydrosilylation. Comments concerning the structure of the homopolymer, poly(phenylsilsesquioxane), pT ϕ , are made with reference to the structures of the isomeric oligomers reported as well as literature descriptions of the structure of this polymer.

Thermodynamic Analysis of the Main Reactions Involved in the Synthesis of Organosilanes

“…It can react with lithium aluminum tetrahydrogen, and the Si–OH bond can be reduced to the Si–H bond, generating a straight-chain polysiloxane capping agent with hydrophobicity . Organosilicon alcohols are one of the most essential intermediates in producing organosilicon alcohol salts and various polysiloxane products, including silicone oil, silicone rubber, and silicone resin . (CH 3 ) 3 SiOH can be obtained by hydrolysis of organochlorosilanes, such as trimethylchlorosilane.…”

“…41 Organosilicon alcohols are one of the most essential intermediates in producing organosilicon alcohol salts and various polysiloxane products, including silicone oil, 42 silicone rubber, 43 and silicone resin. 44 (CH 3 ) 3 SiOH can be obtained by hydrolysis of organochlorosilanes, such as trimethylchlorosilane. The thermody-namics of this reaction will be discussed in the following section.…”