The modification of silicone monomers is to change their molecular structure through chemical reactions to improve performance or give new functions. The following are common modification methods:
1. Introduction of functional groups
Different functional groups, such as hydroxyl, amino, epoxy, etc., are introduced into silicone monomers through chemical reactions to enhance their reactivity or compatibility with other materials.
Hydroxyl modification: Introduce hydroxyl groups to enhance compatibility with polar materials.
Amino modification: Introduce amino groups to enhance reactivity with materials such as epoxy resins.
Epoxy modification: Introduce epoxy groups to enhance reactivity with curing agents.
2. Copolymerization modification
Copolymerize silicone monomers with other monomers to form copolymers to improve performance.
Copolymerization with acrylates: Improve weather resistance and adhesion.
Copolymerization with epoxy resins: Enhance mechanical properties and heat resistance.
3. Grafting modification
Grafting other polymer chains on the silicone monomer molecular chain to give it new properties.
Grafted polyether: Improve hydrophilicity and flexibility.
Grafted fluorocarbon chains: Enhance hydrophobicity and chemical resistance.
4. Cross-linking modification
Through cross-linking reaction, a three-dimensional network structure is formed to improve mechanical properties and heat resistance.
Peroxide cross-linking: A free radical reaction is initiated by peroxide to form a cross-linked structure.
Silylation cross-linking: A cross-linked structure is formed through silylation reaction.
5. Nanocomposite modification
Introducing nanomaterials (such as nanosilica and nanoclay) into silicone monomers to improve mechanical properties and thermal stability.
Nanosilica modification: Enhance mechanical strength and wear resistance.
Nanoclay modification: Improve barrier properties and thermal stability.
6. Surface modification
Change the surface properties of silicone monomers, such as wettability and adhesion, through surface treatment.
Plasma treatment: Change the surface chemical composition and improve wettability.
Surface coating: Apply other materials to improve surface properties.
7. Functional modification
Give special functions to silicone monomers through chemical reactions, such as conductivity or antibacterial properties.
Conductivity modification: Introduce conductive fillers (such as carbon nanotubes) to improve conductivity.
Antibacterial modification: Introduce antibacterial agents (such as silver ions) to impart antibacterial properties.
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