Question

the general empirical formula for poly siloxanes​

Answer 1

Answer:

Polysiloxanes (silicones)

Polysiloxanes are widely used for medical applications and have a long success record. Material types include elastomers, gels, lubricants, foams and adhesives. Polysiloxanes are very chemically stable and unreactive. They are very hydrophobic and have a low moisture uptake. They have good electrical insulation characteristics. Polysiloxanes are the polymer of choice for long-term use in the body where an elastomer is required and where there is a demand for biodurability and biocompatibility. Nearly all polysiloxanes are based on polymethylsiloxane; the chemical structure of which is given below:

CH3

(-O-SI-)n

CH3

Note the lack of any polar groups in the structure. This leads to a very hydrophobic polymer with poor wetting characteristics. Polymethylsiloxane is rarely used without modification.