Hexaphenylcyclotriazane is a polymer used in the manufacture of coatings. It is highly soluble in benzene and has several uses in coatings. Using this polymer is a cost-effective alternative to petroleum-based coatings. Hexaphenylcyclotrisilazane is also soluble in water and benzene.
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Hexaphenylcyclotriazane is a highly stable, infusible polymer. Its molecular weight is approximately 597. This polymer has very good thermal stability and has a high melting point. The melting point of this polymer is 512 C. The mass solidifies at a temperature of 560 C and evolves to benzene. Further heating converts the mass to a foamed, pale yellow transparent solid.
Infusible polymers are soluble in a variety of solvents. This evaporation rate allows the polymer to be dissolved in various solvents and formed into fibers and coatings. The polymer can be formulated with a large concentration of toluene. The solvent allows for good flexibility and deposition rates at low temperatures.
The synthesis of this compound can be carried out at atmospheric pressure. The reaction of NH 3 and silylamine with a solvent at a temperature of 400 to 500deg C will produce a solid or viscous liquid. The degree of polymerization must be controlled so that the polymer remains soluble at the film curing temperature. The preferred range of polymerization is 450 to 500 deg C., which corresponds to reaction times ranging from one hour to twenty four hours.
The properties of the Hexaphenylcyclotri-silazane and Silyl-amine polymer are dependent upon the degree of polymerization. The degree of polymerization must be high enough to make the polymer soluble at film cure temperatures. The preferred polymerization temperature range is 450-500deg C., corresponding to reaction times of 1 hour to 24 hours.
Hexaphenylcyclotri-silazane exhibits a high degree of thermal stability. It lost 25 g of weight when heated to 850 C. In nitrogen, the rapid weight loss occurred between 550 and 650 C. It remains transparent and foamy after further heating. Gas chromatographic analysis revealed that 99.6% of the polymer was benzene, 0.7% was diphenyl, and other compounds of higher boiling points.
The reaction of hexaphenylcyclotrisilane with methylphenyldichlorazène leads to a glassy, brittle solid. The reaction is accompanied by a vapor of benzene. In this study, the reaction was carried out in nitrogen.
The reaction of NH 3 with dichlorosilane gives a monomer characterized by a ring structure consisting of cyclotrisilazane and cyclotetrasilazane. This crude monomer mixture is then subjected to polymerization. A crude product derived from this procedure is characterized by its tetrameric structure and is insoluble in toluene.
The reaction between dimethyldichlorosilane and ethylenediamine results in a solid containing a high level of benzene. This polymer is stable to organic solvents, heat, and acids. Its thermal stability is exceptional. The addition of a dimethylsilyl derivative of ethylenediamine improves the flexibility of the coatings.
Diphenyldichlorosinone is an organic compound with silicon atoms bonded to chlorine. It reacts aggressively with moisture, water, steam, and air, producing toxic fumes of hydrogen chloride. And also flammable, and its chemical reaction products are hazardous to metals and tissues.
And synthesized by distilling the diphenyldichlorosiloxane and methylphenyldichlorosilane in dry toluene, and stirring in an atmosphere of ammonia for 5 hours. The temperature climbed to 80deg C during the reaction, but fell to 15deg C afterward. The filtrate was separated from the ammonia by filtration, and the benzene was removed by evaporation under reduced pressure. A cloudy product was obtained, and it was not crystallized until a few days at C.
This compound has a molecular weight of 597. It melts in a benzene solution at about 510 C, and its molecular weight rises rapidly to around 1500. After heating the material to 650 C, the molecular weight decreased to just 2%, and the solvent was no longer soluble.