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EC number: 230-391-5
CAS number: 7085-85-0
Calorimetric techniques were used to monitor the bulk polymerization of
cyanoacrylate monomers in aqueous solutions and on glass surfaces. Both
Ethyl CA (ECA) and Ally! CA (ACA) undergo instantaneous rapid
polymerization on mixing with equal volumes of water (de-ionised and tap
water) within seconds to minutes.
ECA polymerizes more rapidly relative to ACA. The difference in monomer
reactivity can be attributed to the higher hydrophobicity of ACA which
makes ACA intrinsically less soluble in water resulting in a tendency to
fonn larger droP,let sizes when mixed with water. The larger droplet
size results in a lower interfacial surface area to volume ratio
compared to ECA, with a lower rate of polymerization due to the reduced
water-monomer interfacial surface area. There are also differences in
the weak acid contents of the ECA and ACA monomers resulting in a
retarded ACA polymerization response. Both monomers undergo very rapid
polymerization on glass beads within seconds.
ATR FT-IR spectroscopy was also used to monitor real-time polymerization
of a droplet of ECA monomer when exposed to a fine mist of water
droplets. Real-time monitoring for the disappearance of the C=C and - CN
stretch absorption bands at 1287 cm-1 and 2239 cm·1 respectively, with
concomitant formation of the -Cfostretch absorption band at 1250 cm·1
indicate rapid polymerization of a droplet of CA monomer within minutes
of being exposed to water.
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