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Antioxidant‐associated color problems in vinyl foams
Author(s) -
Renshaw J. T.,
Can J. A.
Publication year - 1974
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760140612
Subject(s) - stabilizer (aeronautics) , plasticizer , antioxidant , materials science , diazo , chemical engineering , organic chemistry , composite material , chemistry , mechanical engineering , engineering
Investigations of chemically‐blown vinyl foam systems, based on electrical grade plasticizers, have shown that the inclusion of 2,2′‐bis (4‐hydroxyphenyl) propane (BPA) as an antioxidant results in color formation in the finished foam. Color formation appears to be due to interactions between BPA and the azodicarbonamide blowing agent. Metal ion(s) present in vinyl stabilizer/kickers are also shown to have an effect on color hue though not on color development per se . Mechanisms for the development of quinoidal and diazo color bodies, based on the reaction of BPA and azodicarbonamide are postulated. Based on these reaction mechanisms, it is shown that it is possible to choose an antioxidant that will not interact with azodicarbonamide. A rudimentary screening procedure is described for evaluating these systems.