TransPoly: A theoretical model to quantify the dynamics of water transfer through nanostructured polymer films

POLYMER

卷:191

Article

Almeida, Giana¹  Domenek, Sandra¹  Perre, Patrick^2,3 

[1] Univ Paris Saclay, INRAE, UMR SayFood, AgroParisTech, F-91300 Massy, France

[2] Univ Paris Saclay, Lab Genie Proc & Mat, Cent Supelec, F-91190 Gif Sur Yvette, France

[3] CEBB, LGPM, Cent Supelec, 3 Rue Rouges Terres, F-51110 Pomacle, France

关键词: Barrier properties;    Chemical potential;    Cellulose nanocrystals;    Non-Fickian diffusion;    Mathematical model;    Relaxation time;   

DOI  :  10.1016/j.polymer.2020.122256

来源: Elsevier

【 摘 要 】

Mass transfer of penetrants is among the most important physical properties of polymer films to properly ensure function during service. In the case of interaction between penetrants and polymer, non-Fickian diffusion can be observed. This phenomenon is described by numerous reports and a few models have been proposed. Nevertheless, few of them quantify Fickian and non-Fickian behaviour using parameters with clear physical meaning. The present work develops a new non-Fickian mass transport model: TransPoly (Transfer through Polymers). Based on coupled heat and mass transfer, it accounts for simultaneous Fickian transport and molecular relaxation. This model is applied to data of water vapour mass transfer in nanocomposites of polylactide and cellulose nanocrystals. The contribution of the non-Fickian mass transfer on water vapour sorption is highlighted. TransPoly can be applied to several kinds of polymers and used for prediction purposes once the parameters are determined on a learning database.

【 授权许可】

Free