SYNTHESIS AND CHARACTERIZATION OF SOME PARA-NONYLPHENOL FORMALDEHYDE RESINS

Para-nonylphenol formaldehyde resins with molecular weights ranging within 490 and 1400 were synthesized in acidic catalysis. The resins were characterized by spectral methods (i.r. and H-1-NMR spectroscopy) and as rheological behavior. The i.r. spectra put in evidence the bands characteristic to -OH phenolic group, respective to -CH2 and CH3 groups placed in the nonyl radical, and the bands for substituents in positions of the aromatic ring as follows: 1.2, 1.4 and 1.2.4, respectively. With the aid of H-1-NMR spectroscopy there have been calculated some structural parameters, such as: formaldehyde/para-nonylphenol molar ratio and the number of aromatic protons per phenolic units. The variation of the apparent shear viscosity vs the shear rate showed that para-nonylphenol formaldehyde resins have a non-Newtonian rhelogical behaviour of pseudoplastic type