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Esr study of the migration of paramagnetic additives from rigid PVC to pure or mixed fatty esters used as food simulators
Author(s) -
Riquet A. M.,
Wolff M.,
Feigenbaum A.
Publication year - 1994
Publication title -
packaging technology and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 50
eISSN - 1099-1522
pISSN - 0894-3214
DOI - 10.1002/pts.2770070404
Subject(s) - paramagnetism , methyl oleate , chemistry , penetration (warfare) , lability , organic chemistry , chemical engineering , polymer chemistry , materials science , physics , quantum mechanics , operations research , engineering , catalysis
The ESR study presented here provides an insight into the behaviour of paramagnetic additives in rigid PVC before, during and after contact with methyl fatty esters and their migration from the plastic material. Before contact, diffusion processes took place in rigid PVC. The mobility of the NO group of the paramagnetic additives is directly linked to the displacement of the whole molecule. Methyl fatty esters plasticize the PVC matrix, increase the mobility of the additive in the material and enhance their migration. The increased lability is due to methyl ester penetration into the polymeric network. Penetration was greatest with short chain esters and probe migration was greater when more penetrating simulators were used. If a fast migration test is required, methyl oleate could be an interesting approach. Results describing the behaviour of binary mixtures as simulators are very complex, probably because they depend to a large extent on the type of paramagnetic additive.