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Updated: Jun 17, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
Published on: September 26, 2016
Diffusion of homologous model migrants in rubbery polystyrene: molar mass dependence and activation energy of
Jérémy Pinte1, Catherine Joly, Patrice Dole
1UMR FARE (INRA-URCA), Moulin de la Housse, BP 1039, 51867 Reims Cedex 2, France.
Abstract:
Published diffusion prediction models for the diffusion of additives in food packaging simplify reality by having a small number of parameters only. Therefore, extrapolation of such models to barrier polymers, larger ranges of temperature and/or additive molecular weight (M(W)) is questionable. Extra data is still required to generalize these existing prediction models. In this paper, diffusion of a specifically designed homologous set of model additives (from 236 to 1120 g mol(-1)) was monitored in two polystyrenes in the rubbery state (from 100 to 180 degrees C): syndiotactic semi-crystalline polystyrene and its amorphous equivalent. Variations in associated diffusion coefficient D and activation energy Ea with migrant M(W) and temperature were surprisingly low. Comparison of experimental behaviour with model predictions was performed. In their actual form, none of the models is capable of describing all experimental data, but there is evidence of convergence of the different approaches.
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