A siloxane is any chemical compound composed of units of the form R2SiO, where R is a hydrogen atom or a hydrocarbon group. They belong to the wider class of organosilicon compounds.

Siloxanes can have branched or unbranched backbones consisting of alternating silicon and oxygen atoms -Si-O-Si-O- (connected by a σ-bond with a length of 1,64 ± 0,03 Å), with side chains R attached to the silicon atoms. More complicated structures are also known, for example eight silicon atoms at the corners of a cube, connected by 12 oxygen atoms as the cube edges.

The word siloxane is derived from the words silicon, oxygen, and alkane.

Polymerized siloxanes with organic side chains (R ≠ H) are commonly known as silicones or as polysiloxanes. Representative examples are n (polydimethylsiloxane) and n (polydiphenylsiloxane). These compounds can be viewed as a hybrid of both organic and inorganic compounds. The organic side chains confer hydrophobic properties while the -Si-O-Si-O- backbone is purely inorganic. Also halogens, mainly chlorine, are possible as side compound R.

Read more about Siloxane:  Naming, Production, Applications, Siloxanes in Biogas, Siloxanes For The Membrane Technology

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