Table 1 FT-IR absorbance spectra and the corresponding functional groups of the monomers observed during polymerization

Catechol

578.5 cm^–1: Halogens C-Br Strong-Stretching

584.325 cm^–1: Halogen C-Br-strong-stretching

1368.25 cm^–1: Alcohol OH Medium-Deformation

1631.5 cm^-1: Alkenes C =C Variable-Stretching non conjugated C =C

1637.27 cm^–1: Alkenes C =C-Variable-Stretching Non conjugated C =C

1739.48 cm^–1: Aldehydes C =O Strong-Stretching saturated aliphatic aldehyde

3327.6 cm^–1 : Alcohols OH Variable-Stretching hydrogen-bonded

2156.99 cm^–1: Amine salts NH-Medium-Stretching-Secondary amine salt

3331.43 cm^–1: Alcohol OH-Variable-Stretching hydrogen-bonded

p-Hydroxy benzoic acid

570.8 cm^–1Halogens C-Br Strong-Stretching

429.084 cm^–1: Sulfur compounds S-S Variable-Stretching

1368.25 cm^–1: Alcohol OH Medium-Deformation

1637.3 cm^–1: Alkenes C =C Variable-Stretching non conjugated C =C

1644.02 cm^–1: Alkenes NH Variable-Stretching Secondary amine salts

1739.48 cm^–1: Aldehydes C =O Strong-Stretching saturated aliphatic aldehyde

3340.1 cm^–1 Alcohols OH Variable-Stretching hydrogen-bonded

2162.78 cm^–1: Amine salts NH Medium-Stretching Secondary amine salts

2355.62 cm^–1: Amine salts NH Medium-Stretching Tertiary amine salts

3402.78 cm^–1: Amines NH Weak-Secondary amine

Ferulic acid

1637.3 cm^–1: Alkenes C =C Variable-Stretching non conjugated C =C

556.363 cm^–1: Halogens C-Br Strong-Stretching

1637.3 cm^–1: Alkenes C =C Variable-Stretching Non conjugated C =C

3340.1 cm^–1 : Alcohols OH Variable-Stretching hydrogen-bonded

1325.8 cm^–1: Alcohol OH Strong-Deformation

2112.6 cm^–1: Alkynes CΞC Variable-Stretching Mono substituted

1636.3 cm^–1: Alkenes C =C Variable-Stretching Non conjugated C =C

3328.53 cm^–1: Alcohol OH Variable-Stretching hydrogen-bonded

2156.99 cm^–1: Amine salts NH Medium- Stretching Secondary Amine salts

2338.2 cm^–1: Amine salts NH Medium-Stretching Tertiary amine salts

2369.12 cm^–1: Amine salts NH Medium-Stretching Tertiary amine salts

3331.43 cm^–1: Alcohol OH Variable-Stretching Hydrogen Bonded

Salicylic acid

1637.3 cm^–1: Alkenes C =C Variable-Stretching non conjugated C =C

1214.93 cm^–1: Alcohol C-O Strong- Stretching

1637.3 cm^–1: Alkenes C =C Variable-Stretching Non conjugated C =C

3340.1 cm^–1 : Alcohols OH Variable-Stretching hydrogen-bonded

1367.28 cm^–1: Alcohol OH Medium- Deformation

2112.6 cm^–1: Alkynes CΞC Variable-Stretching Mono 3328.53substituted

1737.55 cm^–1: Aldehyde C =O Strong- Stretching saturated aliphatic aldehyde

3328.53 cm^–1: Alcohol OH Variable-Stretching hydrogen-bonded

2331.52 cm^–1: Amine salts NH Medium to strong-stretching tertiary amine salts

3454.8 cm^–1: Amines NH Weak- Stretching Secondary amines

3627.4 cm^–1: Silicon compounds OH Medium-Stretching Broad peak