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What has brought on the effects of number-average molecular weight on the spinodals in polymer mixtures?
Yang, J; Sun, ZY; Jiang, W; An, LJ
2002-10-31
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY B
ISSN1520-6106
Volume106Issue:43Pages:11305-11314
AbstractOn the basis of the thermodynamics of Gibbs, the spinodal for the quasibinary system was derived in the framework of the Sanchez-Lacombe lattice fluid theory. All of the spinodals were calculated based on a model polydisperse polymer mixture, where each polymer contains three different molecular weight subcomponents. According to our calculations, the spinodal depends on both weight-average ((M) over bar (w)) and number-average ((M) over bar (n)) molecular weights, whereas that of the z-average molecular weight is invisible. Moreover, the extreme of the spinodal decreases when the polydispersity index (eta = (M) over bar (w)/(M) over bar (n)) of the polymer increases. The effect of polydispersity on the spinodal decreases when the molecular weight gets larger and can be negligible at a certain large molecular weight. It is well-known that the influence of polydispersity on the phase equilibrium (coexisting curve, cloud point curves) is much more pronounced than on the spinodal. The effect of M, on the spinodal is discussed as it results from the infuluence of composition temperatures, molecular weight, and the latter's distribution on free volume. An approximate expression, which is in the assumptions of v* v(1)* = v(2)* and 1/r --> 0 for both of the polymers, was also derived for simplification. It can be used in high molecular weight, although it failed to make visible the effect of number-average molecular weight on the spinodal.
DOI10.1021/jp020640j
Indexed BySCI
Language英语
WOS IDWOS:000178874100034
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/78486
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. What has brought on the effects of number-average molecular weight on the spinodals in polymer mixtures?[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2002,106(43):11305-11314.
APA Yang, J,Sun, ZY,Jiang, W,&An, LJ.(2002).What has brought on the effects of number-average molecular weight on the spinodals in polymer mixtures?.JOURNAL OF PHYSICAL CHEMISTRY B,106(43),11305-11314.
MLA Yang, J,et al."What has brought on the effects of number-average molecular weight on the spinodals in polymer mixtures?".JOURNAL OF PHYSICAL CHEMISTRY B 106.43(2002):11305-11314.
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