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Synthesis and characterization of some Para-nonylphenol formaldehyde resins

✍ Scribed by C.N. Caşcaval; D. Roşu; F. Mustaţǎ

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
303 KB
Volume
30
Category
Article
ISSN
0014-3057

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✦ Synopsis

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-NMR spectroscopy) and as rbeological behavior. The i.r. spectra put in evidence the bands characteristic to ---OH phenolic group, respective to ~CH 2 and ---CH 3 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-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.

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