Zero and Off-Zero Critical Concentrations in Systems Containing Polydisperse Polymers † with Very High Molar Masses. 2. The System Water−Poly(vinyl methyl ether)
Cloud-point curves by DSC measurements at different scanning rates on solutions of two samples of poly(vinyl methyl ether) in water show two minima in a temperature−composition plot. The significance of the data was confirmed by static measurements of the coexisting-phase compositions and phase-volu...
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Published in | Macromolecules Vol. 30; no. 3; pp. 410 - 416 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Washington, DC
American Chemical Society
10.02.1997
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Subjects | |
Online Access | Get full text |
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Summary: | Cloud-point curves by DSC measurements at different scanning rates on solutions of two samples of poly(vinyl methyl ether) in water show two minima in a temperature−composition plot. The significance of the data was confirmed by static measurements of the coexisting-phase compositions and phase-volume ratios. A thermodynamic analysis in terms of a strongly concentration-dependent interaction parameter leads to the conclusion that the system H2O/PVME exhibits so-called type III behavior. For polymers of infinite molar mass, such behavior is characterized by the occurrence of two off-zero critical concentrations, in addition to the usual zero critical concentration marking the ϑ state. |
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Bibliography: | Dedicated to Professor Werner Borchard (Duisburg) on the occasion of his 60th birthday. Abstract published in Advance ACS Abstracts, January 1, 1997. istex:7897777FB5CF47B468333B14FF42E896D866DB60 ark:/67375/TPS-NLWCXPWP-Z |
ISSN: | 0024-9297 1520-5835 |
DOI: | 10.1021/ma960114o |