Plasticizer diffusion into PVC particles as studied by ESR spin probe method |
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| Authors: | Miklós Gy?r Antal Rockenbauer László Jókay Ferenc Tüd?s |
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| Affiliation: | (1) Central Research Institute for Chemistry of the Hungarian Academy of Sciences, P.O.Box 17, H-1525 Budapest, Hungary;(2) Department of Chemical Technology, Eötvös Loránd University, Muzeum krt. 6-8, H-1088 Budapest, Hungary |
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| Abstract: | Summary The spin probe technique of electron spin resonance (ESR) spectroscopy has been applied for studying the plasticizer diffusion, migration, and redistribution processes in suspension polymerized PVC particles. In the first series of experiments six PVC powder samples with different K values (58, 61, 64, 67, 70, and 72) were mixed with diisooctyl phthalate (DOP) containing 10–4 M 2,2,6,6-tetramethyl-piperidine-1-oxyl (TEMPO) as stable free radical spin probe. In the second run TEMPO-doped dry PVC powders were mixed with DOP plasticizer. Finally we studied the plasticizer transport phenomena between plasticized and non-plasticized polymer particles in powder mixtures. The observed diffusion properties of different samples were interpreted in terms of the different porosities of powders. |
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