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Statistical thermodynamics of polydisperse polymer systems in the framework of lattice fluid model: Effect of molecular weight and its distribution on the spinodal in polymer solution
Yang, J; Sun, ZY; Jiang, W; An, LJ
2002-04-01
Source PublicationJOURNAL OF CHEMICAL PHYSICS
ISSN0021-9606
Volume116Issue:13Pages:5892-5900
AbstractWith the aid of thermodynamics of Gibbs, the expression of the spinodal was derived for the polydisperse polymer-solvent system in the framework of Sanchez-Lacombe Lattice Fluid Theory (SLLFT). For convenience, we considered that a model polydisperse polymer contains three sub-components. According to our calculation, the spinodal depends on both weight-average ((M) over bar (w)) and number-average ((M) over bar (n)) molecular weights of the polydisperse polymer, but the z-average molecular weight ((M) over bar (z)) dependence on the spinodal is invisible. The dependence of free volume on composition, temperature, molecular weight, and its distribution results in the effect of (M) over bar (n) on the spinodal. Moreover, it has been found that the effect of changing (M) over bar (w) on the spinodal is much bigger than that of changing (M) over bar (n) and the extrema of the spinodal increases with the rise of the weight-average molecular weight of the polymer in the solutions with upper critical solution temperature (UCST). However, the effect of polydispersity on the spinodal can be neglected for the polymer with a considerably high weight-average molecular weight. A more simple expression of the spinodal for the polydisperse polymer solution in the framework of SLLFT was also derived under the assumption of upsilon(*)=upsilon(1)(*)=upsilon(2)(*) and (1/r(1)(0))-(1/r(2i)(0))-->(1/r(1)(0)). (C) 2002 American Institute of Physics.
DOI10.1063/1.1424320
Indexed BySCI
Language英语
WOS IDWOS:000174470700066
PublisherAMER INST PHYSICS
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Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/78678
Collection中国科学院化学研究所
Corresponding AuthorAn, LJ
AffiliationChinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
Recommended Citation
GB/T 7714
Yang, J,Sun, ZY,Jiang, W,et al. Statistical thermodynamics of polydisperse polymer systems in the framework of lattice fluid model: Effect of molecular weight and its distribution on the spinodal in polymer solution[J]. JOURNAL OF CHEMICAL PHYSICS,2002,116(13):5892-5900.
APA Yang, J,Sun, ZY,Jiang, W,&An, LJ.(2002).Statistical thermodynamics of polydisperse polymer systems in the framework of lattice fluid model: Effect of molecular weight and its distribution on the spinodal in polymer solution.JOURNAL OF CHEMICAL PHYSICS,116(13),5892-5900.
MLA Yang, J,et al."Statistical thermodynamics of polydisperse polymer systems in the framework of lattice fluid model: Effect of molecular weight and its distribution on the spinodal in polymer solution".JOURNAL OF CHEMICAL PHYSICS 116.13(2002):5892-5900.
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