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An investigation of the change in the properties and orientation effects of phenoplasts of phenolaniline–formaldehyde resol resin and kaolin filler depending on the degree of elastification of the resin with nitrile rubber
Author(s) -
Bozveliev L. G.
Publication year - 1974
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.1974.070180612
Subject(s) - materials science , composite material , polymer , coating , nitrile , filler (materials) , nitrile rubber , degree (music) , natural rubber , formaldehyde , adsorption , chemistry , organic chemistry , physics , acoustics
An investigation is made of the dependences of the values of 13 types of standard physical, mechanical, and electric insulation indicators for phenoplasts of phenolanilineformaldehyde resol resin on the degree of kaolin filling (within the limits of 24 to 47 vol‐%) and different degrees of elastification (expressed in SKN‐40 nitrile rubber content ranging from 0 to 40 vol‐% as to the polymer). After expressing these dependences as a function of the recalculated average thickness of the adsorption coating of elastified resin on the filler particles, it is established that the characteristic periodical recurrence of concave and convex sectors in the curves for the individual indicators with the nonelastified phenoplasts, which is due to the orientation effects, is preserved also with the elastified phenoplasts. A method is elaborated of determining the average weighted value of the average thickness of the adsorption coating in the points of the orientation extremums of these curves. It is found that the places of the individual extremums change relatively little with the increase in the degree of elastification. A considerable change in the relative values of the orientation effects is observed after the point of phase inversion of the elastified resin (18 to 20 vol‐% of SKN‐40 as to the polymer) in connection with the sharp increase in the mobility of the resin globules. The author believes that the proposed mechanism of change of the properties with the filling will be observed, under definite conditions, also when filling with powdered fillers other polymers or blends of polymers, in so far as the latter are made up of supramolecular structural formations with a definite statistical distribution of their average sizes.