syklosiloksaanit

Cyclosiloxanes are a group of synthetic organosilicon compounds characterized by a cyclic structure containing alternating silicon and oxygen atoms. The most common examples are based on a siloxane backbone, which is a chain of repeating silicon-oxygen units. These cyclic structures are often denoted by the general formula [(R2SiO)n], where R represents organic groups, typically methyl groups, and n is an integer greater than or equal to 3, indicating the number of repeating siloxane units in the ring. Commonly encountered cyclosiloxanes include octamethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5).

These compounds are widely used in various industries due to their unique properties, such as low surface tension, volatility, and inertness. They are frequently found in personal care products like cosmetics, lotions, and hair care items, where they provide a smooth, silky feel and aid in product spreadability. Cyclosiloxanes also serve as carriers for active ingredients and contribute to the water-repellent properties of certain formulations. Their applications extend to industrial settings, including lubricants, sealants, and as components in silicone elastomers. The environmental fate and potential bioaccumulation of some cyclosiloxanes have been subjects of scientific research and regulatory interest.