Evaluation of isomeric composition of resol‐type phenol formaldehyde matrix resins for silica–phenolic composites and its effect on cure characteristics of the resin | Zendy

Scariah K. J. | Zendy; Usha K. M. | Zendy; Narayanaswamy K. | Zendy; Shanmugam K. | Zendy; Sastri K. S. | Zendy

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Evaluation of isomeric composition of resol‐type phenol formaldehyde matrix resins for silica–phenolic composites and its effect on cure characteristics of the resin

Author(s) -

Scariah K. J.,

Usha K. M.,

Narayanaswamy K.,

Shanmugam K.,

Sastri K. S.

Publication year - 2003

Publication title -

journal of applied polymer science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.575

H-Index - 166

eISSN - 1097-4628

pISSN - 0021-8995

DOI - 10.1002/app.12918

Subject(s) - phenol , formaldehyde , curing (chemistry) , materials science , phenol formaldehyde resin , fourier transform infrared spectroscopy , hydroxymethyl , activation energy , kinetics , composite material , polymer chemistry , chemistry , chemical engineering , organic chemistry , physics , quantum mechanics , engineering

The isomeric composition of several samples of resol‐type phenol formaldehyde resins used for silica–phenolic composites was evaluated by 1 H‐ and 13 C‐NMR spectroscopy and reverse‐phase HPLC techniques. The variations in the isomeric compositions were attributed to inadvertent variations in the process parameters. A mathematical relation was determined for calculation of free phenol from 1 H‐NMR measurements. The samples were cured at 160°C for 8 h in an inert atmosphere of N 2 . The extent of cure in the hardened samples was measured by FTIR analysis. The effect of isomeric composition on the extent of cure was studied. Free phenol and p ‐hydroxymethyl phenol, exhibiting a linear correlation, were found to have a pronounced effect on the extent of cure. The cure kinetics were derived by dynamic DSC measurements. Activation energy ( E ) for curing exhibited a near linear correlation independently with free phenol content and the extent of cure. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 2517–2524, 2003

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