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Hazard Predictions

• Flammable: Reaction products may be flammable
• Generates gas: Reaction liberates gaseous products and may cause pressurization
• Generates heat: Exothermic reaction at ambient temperatures (releases heat)
• Polymerization hazard: Polymerization reaction may become intense and may cause pressurization

Acrylates are carboxylates and carboxylic acids with a conjugated vinyl group attached to the carbonyl (i.e. derivatives of 2-propenoate). While no specific information was found on the interaction between acrylates and metal hydrides or metal alkyls, these metal compounds are known to polymerize conjugated dienes and to react exothermically with carboxylic acids. At minimum, metal hydrides will generate H2 and metal alkyls will generate flammable hydrocarbons upon reaction with acrylic acid monomers (as they would with any proton donor). However, since there is also the potential for polymerization, this combination should be treated with great caution.

For more information on the reactivity of hydrides, including initiation of polymerization and reactions with acids, see the following reference: Rittmeyer, P., U. Wietelmann. 2002. Hydrides. In Ullmann's Encyclopedia of Industrial Chemistry. Wiley-VCH Verlag GmbH & Co. KGaA. (Online)

Acrylates and acrylic acids are polymerizable materials and are typically inhibited with low ppm levels of antioxidants (inhibitors) to prevent premature polymerization chain reactions. Many of these inhibitors require dissolved oxygen to be effective. Inhibitor depletion is a function of time and temperature, with higher temperatures increasing depletion rates. These materials are known to be susceptible to destabilization due to low ppm levels of contaminants. Radical generating contaminants such as peroxides and azides are known to initiate monomer polymerization; however, the effects of seemingly benign materials are harder to predict. Therefore, extreme caution should be used in any contamination event. And the material should be presumed to be destabilized until testing and consultation with experts. Uncontrolled polymerization reactions can become adiabatic and lead to a serious runaway reaction with high temperatures and pressures. The general hazards of monomers are discussed in Frurip et al., Process Safety Progress (Vol. 14, No. 2) 1995.

Potential Gas Byproducts

• Hydrogen (H2)
• Hydrocarbons