Abstract
AbstractSome alkenyl‐ and alkinyl‐2‐cyanoacrylate monomers, possessing adhesive properties were synthesized. The ease of esterification of cyanoacetic acid, the first step of the synthesis, with some alcohols was in the following order: magnified image After condensation of the cyanoacetates with formaldehyde to low molecular weight polymers and depolymerization in vacuum, allyl‐2‐cyanoacrylate, propargyl‐2‐cyanoacrylate, 1‐methyl‐2‐propinyl‐2‐cyanoacrylate and 1‐propyl‐2‐propinyl‐2‐cyanoacrylate were obtained, the last two for the first time. It was found that the strength of the adhesive bonds of these monomers depends primarily on the number of C atoms in the ester group of the molecule, i.e. magnified image The introduction of double and triple bonds increases the tensile strength properties. The unsaturated cyanoacrylates also have a better heat‐resistance of their bonds: CH2CHCH2 > CHCCH2 > CHCC(CH3)H > CHCC(C3H7)H > alkyl. This result is explained with the formation of cross‐links in the adhesive layer, confirmed by IR and thermogravimetric data.
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