12. (6 pts.) Superglue is a monomer, methyl cyanoacrylate, which polymerizes upo

Question

12. (6 pts.) Superglue is a monomer, methyl cyanoacrylate, which polymerizes upon exposure to air to give polymethylcyanoacrylate. The polymer is the glue. Shown below is an infrared spectrum of the polymer. Assign the peaks in the infrared spectrum of this polyester with frequencies greater than 1500 cm1 to specific bond vibrations AND the functional group the bond is associated with. Clearly indicate the specific bond vibration that is associated with the relevant peaks CH3 CH t) CH3 C3 C3 polymethyl cyanoacrylate methyl cyanoacrylate gnore 75 3500 3000 2500 2000 1800 1600 1400 1200 000 800 600

Explanation / Answer

2900 cm-1 sp3 C-H stretch, 1720 cm-1 is carbonyl stretch of ester, 2220 cm-1 is the cyano stretch, 1050 cm-1 is the C-O stretch. (3100 cm-1 Sp2 C-H stretch and 1600 cm-1 is C=C stretch are absent indicates disappearence of starting material). All above data indicates presence of polymethyl cyanoacrylate.

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