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The influence of stabilizers on mechanochemical processes in SBR rubbers
Author(s) -
Ristić Rodoljub,
Vrhovac Ljubica,
Plavšić Milenko
Publication year - 1999
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/(sici)1097-4628(19990509)72:6<835::aid-app9>3.0.co;2-1
Subject(s) - polymer science , materials science , composite material , chemical engineering , polymer chemistry , engineering
Mechanochemical processes in commercial and model SBR rubbers containing different stabilizers were investigated. The influence of chemical structure and concentration of stabilizers in the temperature range from 20–170°C and in the presence of air, i.e., under conditions similar to that in industrial processes, were studied. Stabilizers used were diaryl‐ p ‐phenylene‐diamine, alkyl‐aryl‐ p ‐phenylene diamine, polynuclear phenol, aryl‐alkyl phenol, and alkyl‐alkyl phenol. It was found that mechanochemical processes in SBR rubbers are less developed in the temperature region from 70–130°C, so the influence of stabilizer is less expressive. During increasing temperature (130–170°C) structure and concentration of stabilizers both show a strong influence on type and intensity of mechanochemical processes in SBR rubbers: p ‐phenylene‐diamines favor processes of linear degradation, while phenol stabilizers direct them toward branching and crosslinking, which is more expressed in the presence of aryl‐substituted phenols than alkyl‐substituted phenols. This fact is based on the differences in stability of free stable radicals of p ‐phenylene‐diamines, alkyl‐substituted phenols and aryl‐substituted phenols. The fact that phenol stabilizers are involved in chain degradation as well as in branching and crosslinking processes during rubber processing, can be of high practical importance. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 72: 835–847, 1999