SYNTHESIS AND CHARACTERIZATION OF SOME PARA-NONYLPHENOL FORMALDEHYDE RESINS

Para-nonylphenol formaldehyde resins with molecular weights ranging wi thin 490 and 1400 were synthesized in acidic catalysis. The resins wer e characterized by spectral methods (i.r. and H-1-NMR spectroscopy) an d as rheological behavior. The i.r. spectra put in evidence the bands characteristic to -OH phenolic group, respective to -CH2 and CH3 group s placed in the nonyl radical, and the bands for substituents in posit ions 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 r atio and the number of aromatic protons per phenolic units. The variat ion of the apparent shear viscosity vs the shear rate showed that para -nonylphenol formaldehyde resins have a non-Newtonian rhelogical behav iour of pseudoplastic type