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Chemical and physical behavior of phenolic resins in air‐dried films of phenolic varnishes
Author(s) -
Chen L. W.,
Kumanotani Ju
Publication year - 1965
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.1965.070090813
Subject(s) - varnish , autoxidation , linseed oil , lacquer , acetone , reactivity (psychology) , organic chemistry , materials science , chemistry , fourier transform infrared spectroscopy , polymer chemistry , chemical engineering , coating , engineering , medicine , alternative medicine , pathology
Chemical and physical behavior of the oil soluble phenolic resins in phenolic varnish films were investigated by means of dynamic‐mechanical measurement, infrared spectra, and M̄ c measurement. The viscoelastic property of phenolic varnish films or increase in ( T g ) d due to the addition of resin is the same regardless of the types of phenolic resin (oil‐reactive or oil‐nonreactive) employed, and despite the lower reactivity of the oil‐nonreactive phenolic resin in the cooking stage. A reaction takes place between the oil‐nonreactive phenolic resin and drying oil in the course of autoxidation and proceeds in aging, resulting in a network in which the phenolic resin is the backbone. Both the crosslinking and filling of resin were effective in increasing the ( T g ) d of the films; crosslinking is the better method as it results in films having a smaller acetone‐extractable portion.