Particularity of Microemulsion Polymerization Mechanism
Jul 7, 2023
Because of the particularity of micro lotion polymerization mechanism and the diversity of polymerization methods, it has become one of the hot areas of lotion polymerization research. The silicone modified acrylate micro lotion was synthesized by continuous lotion polymerization. The effects of polymerization conditions, silicone and polymer concentration on the synthesis of silicone acrylate micro lotion were discussed. The results showed that when the ratio of emulsifier SDS/TMS was 4:1, the reaction temperature was 65~75 ° C, and the amount of electrolyte was 0.3g, it was conducive to the synthesis of silicone acrylate micro lotion with an average particle size of 40~80nm and uniform distribution.
The microemulsions of Methyl methacrylate and Butyl acrylate were synthesized with vinyl organosiloxane rubber as stabilizer and persulfate as initiator. The results showed that the polymerization rate decreased with the increase of the molecular weight and vinyl content of the silicone rubber, and it was found that when the weight of the silicone resin was 1 When Og (accounting for 10% of the monomer mass), the polymerization reaction speed is the fastest.
Synthesis of silicone modified polyimide
Polyimide (PI) is an aromatic heterocyclic polymer containing Imide groups in the main chain. Its synthesis route was first disclosed by Bagert et al. yu 1908, but it was not until the early 1960s that polyimide entered an era of great development with the commercialization of polyimide film (Kapton) and varnish (Pyre ML). This type of polymer is a resin with excellent heat resistance, electrical properties, chemical stability, and mechanical properties. It has outstanding strength, wear resistance, and excellent high-temperature performance, so it has been widely used in many high-performance applications such as aerospace, electronic industry, optical wave communication, bulletproof materials, and gas separation.
The main chain of polyimide generally contains benzene ring and Imide ring structure, as well as electronic polarization and crystallinity. Causing strong intermolecular interactions in PI. Causing tight packing of PI molecular chains. This type of polymer, which is fully imidized, typically has drawbacks such as dark color, insolubility, difficulty in processing and molding, and poor dielectric properties. Its application is greatly limited in many aspects. In order to improve processability or endow adhesion, a large amount of research has been conducted in PI modification abroad in recent years. By changing the synthesis route of PI and copolymerizing or blending with other components, the processability problem of PI has been basically solved, and many of the achievements have been put into industrial production. Among the many modified products of polyimide, silicon containing polyimide is one of the more successful modified products. This technology can simultaneously improve many properties of PI, such as solubility, oxidation degradation resistance, impact resistance, adhesion, electrical properties, surface properties, high and low temperature resistance, processability, lower moisture absorption rate, and lower dielectric constant, making the modified product have excellent comprehensive performance.
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