Knowra Silicone Silicone Silicones are synthetic polymers built around repeating silicon–oxygen backbones with organic side groups. Their stability, flexibility, and water resistance make them useful in products from sealants to medical devices.
Siloxane : A compound or polymer containing silicon–oxygen–silicon linkages. Siloxane linkages form the characteristic backbone of silicone polymers.
Polydimethylsiloxane : A silicone polymer with two methyl groups attached to each silicon atom in its repeating backbone. Its flexible chains and low surface energy account for many familiar silicone properties.
Silicone sealant : A silicone-based material that cures into a flexible, water-resistant joint or coating. It exploits silicone’s adhesion, weather resistance, and ability to accommodate movement.
Silicon : A chemical element with symbol Si, used in semiconductors, alloys, and other materials. Silicone is a polymer containing silicon; elemental silicon is a different substance.
Polysiloxane : A polymer whose repeating units contain silicon–oxygen bonds and organic substituents. This polymer structure underlies silicone’s heat resistance and flexibility.
Silicone curing : The chemical process that converts reactive silicone materials into solid or elastomeric networks. Curing links silicone chains and determines the final material’s shape and mechanical behavior.
Silicone rubber : An elastomer made from cross-linked silicone polymers. This form is used where flexibility and temperature resistance are needed.
Silica : Silicon dioxide, a compound found in quartz and many mineral and glass materials. Silica contains silicon and oxygen but lacks silicone’s organic side groups and polymer chains.
Cross-linking : The formation of bonds between separate polymer chains, creating a connected network. Cross-link density determines whether a silicone is fluid, elastomeric, or rigid.
Hydrosilylation : A chemical reaction that adds a silicon–hydrogen bond across a carbon–carbon double bond. This reaction is widely used to cross-link silicone elastomers.
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