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Antioxidant effects in PVC plasticized with DIDA
Author(s) -
Darby J. R.,
Touchette N. W.,
Sears J. K.
Publication year - 1970
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.1970.070140106
Subject(s) - plasticizer , antioxidant , elongation , adipate , materials science , chemistry , polymer chemistry , composite material , organic chemistry , ultimate tensile strength
Antioxidants such as bisphenol A (BPA) have long been recommended for retention of physical properties on oven‐aging of PVC plasticized with certain plasticizers. We have shown how BPA inhibits oxidative fragmentation of plasticizers such as diisodecyl adipate (DIDA) and thus decreases apparent volatility, and how it improves retention of modulus, elongation, and low temperature flexibility. Low concentrations are more beneficial than either zero or high concentrations, especially on longer aging. At higher concentrations, although the plasticizer is retained in the PVC, it becomes less efficient at low temperature, and low‐temperature flex is impaired while elongation is preserved. DIDA exudes during oven‐aging unless oxidation occurs to prevent it. When BPA is present, exudation is worst at the most efficient concentrations of antioxidant. This appears to be the normal incompatibility of DIDA at 105°C which is permitted by the antioxidant. On oxidation, the dielectric constant of DIDA rises into the 4–8 range, signifying compatibility with PVC, and the DIDA does not exude.