VAZO 88 | (1,1’-Azobis(cyanocyclohexane))
Vazo 88 radical initiator; Highest Initiation Temperature; First-Order Kinetics
Vazo 88 radical initiator, also known as ACHN (1,1’-Azobis(cyanocyclohexane)), is an azo radical initiator source typically used as a polymerization initiator. Vazo 88 is used principally in higher temperature polymerizations with excellent solubilty in a wide variety of organic solvents. Vazo 88 will thermally decomposes to generate free radicals and nitrogen gas. More cost-effective than organic peroxides of comparable activity. Benefits include:
- Higher temperature activation
- Does not compete in costly sides reactions
- Head-to-Tail polymerization
- Unaffected by heavy metals, contamination, additives etc
- Can polymerize oxidation susceptible compound
All the grades are Vazo radical Initiators are essentially insoluble in water, sparingly soluble in aliphatic hydrocarbons, and soluble in functionalized organic compounds and aromatic hydrocarbons. Vazo 88 radical initiator is significantly more soluble in organic solvents and monomers than the other grades. Caution must be used in the handling of highly concentrated solutions to avoid a self-accelerating decomposition.
Solvent-Soluble Vazo™ free radical sources offer a number of advantages over organic peroxides.
- More stable than most peroxides, so can be stored under milder conditions and are not shock-sensitive.
- Decompose with first-order kinetics; not sensitive to metals, acids, and bases; not susceptible to radical-induced decompositions. This makes Vazo™ free radical sources more efficient and predictable than other free radical sources.
- Produce less energetic radicals than peroxides, so there is less branching and cross-linking.
- Are weak oxidizing agents, which lets them be used to polymerize unsaturated amines, mercaptans, and aldehydes without affecting pigments and dyes.
- Are available in four grades to use over a wide temperature range.
Vazo™ free radical sources initiate the addition of compounds such as chlorine, hydrogen sulfide, thiols, and phosphines across double bonds. Vazo™ reacts with unsaturated compounds in equimolar amounts to give monomers and oligomers, which contain two Vazo™-derived groups. These dinitriles can be further converted to amides, amines, or acids. Vazo™ free radical sources initiate halogenations as well as the air oxidation of aromatic and aliphatic hydrocarbons, acrylonitrile, methyl methacrylate, and vinyl acetate. Vazo™ free radical sources release nitrogen gas when used, which can be used as a blowing agent.
For safety, the maximum storage temperatures are as follows: Vazo™ 52 (10°C [50°F]); Vazo™ 64 and Vazo™ 67 (24°C [75°F]); Vazo™ 88 (35°C [95°F]);
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