tailieunhanh - Internal interaction factor in thermodynamic model for heterogeneous mixture

Based on irreversible thermodynamics, a new approach to study sorption in polymer has been proposed [1]. This treatment gives a standpoint different from the existing sorption models [2 - 9] not only in interpretation and nature, but also in analytical expression. Moreover, the model also accounts for diffusion and the other internal processes stimulated by sorption such as swelling, plasticization, crystallization etc. Some experimental results of fluid sorption in polymer have been interpreted by this model. | Journal of Chemistry Vol. 44 5 Tr. 632 - 637 2006 INTERNAL INTERACTION FACTOR IN THERMODyNAMIC MODEL FOR HETEROGENEOUS MIXTURE Received 25 August 2004 NGUyEN XUAN QUANG LE ANH TUAN QUACH DANG TRIEU Institute of Chemistry Vietnam Academy of Science Technology SUMMARY Based on irreversible thermodynamics a new approach to study sorption in polymer has been proposed 1 . This treatment gives a standpoint different from the existing sorption models 2 - 9 not only in interpretation and nature but also in analytical expression. Moreover the model also accounts for diffusion and the other internal processes stimulated by sorption such as swelling plasticization crystallization etc. Some experimental results of fluid sorption in polymer have been interpreted by this model. Sorption species may be created by weak physical interaction between penetrant molecules and various molecular groups in molecular chain of polymer and sorption cluster may be created by weak physical interaction of free fluid molecules with fluid molecules in sorption species. Sorption center which are able to create sorption species and sorption clusters are proposed to be a finite number. Based on these arguments the fluid sorption in polymer matrix can be considered as a heterogeneous mixture where there exist processes of internal state changes such as creations of different sorption species sorption cluster plasticization etc. Generally the polymer molecular groups are able to be considered as a sorption species or sorption clusters with fluid molecules can be called as a sorption center. In the neighborhood of such polymer molecular groups there exist interaction forces. Under influence of this field fluid molecules may get in an excited state. If the distance between the excited molecules and the sorption center is small enough and this sorption center is not occupied then their interaction may lead to create sorption species. Anomalous processes are stimulated by interaction of fluid molecules .