Organosiloxanes are a class of high-molecular compounds with Si- ○ -Si bonds as the main chain and organic groups directly attached to the silicon atoms. Their general structural formula is as follows :(R. sio-m /2). Here, R represents organic groups such as methyl, phenyl, vinyl, etc., and "is the degree of polymerization. Like common polymer compounds, organic polysiloxanes can also be classified into linear, branched-chain, cross-linked and other types according to the differences in chain structure.
The preparation methods of organic polysiloxanes can be roughly divided into two major categories: polycondensation and ring-openingpolymerisation. Polycondensation is a chemical reaction in which monomers with two or more functional groups react with each other to form high-molecular compounds, while also generating small molecules. Ring-opening polymerization is a type of addition polymerization reaction, meaning that no small-molecule by-products are released during the reaction process. Therefore, the chemical composition of the addition polymer is the same as that of the starting monomer.