[en] We report results on the linear viscoelasticity (oscillatory shear in the temperature range Tg (glass-transition temperature) ≤ T ≤ Tg + 90 K) of miscible blends of polystyrene (PS) and poly(vinyl methyl ether) (PVME) and segmental relaxations, measured by dielectric spectroscopy. The Flory−Huggins interaction parameter of this blend is weakly negative, and the glass transitions of the pure components are quite disparate (ΔTg = 125 K). PS/PVME blends have been found to be consistently thermorheologically complex at both the segmental and terminal levels: the empirical time−temperature superposition (tTS) principle applies to neither their oscillatory shear response nor their dielectric response. Using the tube model, we quantitatively compare dielectric and mechanical results. At low temperatures, the effective time scale for motion of a Kuhn segment (the shortest Rouse mode) is near the long-time end of the distribution of segmental relaxation times of PVME, in both the pure and blended states. The slowest relaxing segments thus control the longer-time relaxation processes of the chains. Miscible blends with weak interactions and large ΔTg have concentration fluctuations that broaden the distribution of segmental relaxation times. This distribution narrows as the temperature is raised in the blend, leading to the failure of tTS for terminal dynamics.
Research Center/Unit :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Materials science & engineering Chemistry
Author, co-author :
Pathak, J. A.; The Pennsylvania State University, USA > Departments of Chemical Engineering
Colby, R. H.; The Pennsylvania State University, USA > Department of Materials Science and Engineering
Floudas, G.; Foundation for Research and Technology-Hellas (FORTH), Institute of Electronic Structure and Laser, Heraklion, Greece
Jérôme, Robert ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Language :
English
Title :
Dynamics in miscible blends of polystyrene and poly(vinyl methyl ether)
Publication date :
20 April 1999
Journal title :
Macromolecules
ISSN :
0024-9297
eISSN :
1520-5835
Publisher :
Amer Chemical Soc, Washington, United States - Washington
scite shows how a scientific paper has been cited by providing the context of the citation, a classification describing whether it supports, mentions, or contrasts the cited claim, and a label indicating in which section the citation was made.
Bibliography
Paul, D. R.; Newman, S. Polymer Blends, volume 1. Academic Press: New York, 1978.
Utracki, L. A. Polymer Alloys and Blends: Thermodynamics and Rheology; Carl Hanser Verlag: Munich, 1990.
Ferry, J. D. Viscoelastic Properties of Polymers, 3rd ed.; Wiley: New York, 1980.
Colby, R. H. Polymer 1989, 30, 1275-1278.
Roland, C. M.; Ngai, K. L. Macromolecules 1991, 24, 2261-2265.
Roovers, J.; Toporowski, P. M. Macromolecules 1992, 25, 1096-1102.
Roovers, J.; Toporowski, P. M. Macromolecules 1992, 25, 3454-3461.
Chung, G. C.; Kornfield, J. A.; Smith, S. D. Macromolecules 1994, 27, 964-973.
Chung, G. C.; Kornfield, J. A.; Smith, S. D. Macromolecules 1994, 27, 5729-5741.
Arendt, B. H.; Kannan, R. M.; Zewail, M.; Kornfield, J. A.; Smith, S. D. Rheol. Acta 1994, 33, 322-336.
Zawada, J. A.; Fuller, G. G.; Colby, R. H.; Fetters, L. J.; Roovers, J. Macromolecules 1994, 27, 6861-6870.
Arendt, B. H.; Krishnamoorti, R.; Kornfield, J. A.; Smith, S. D. Macromolecules 1997, 30, 1127-1137.
Pathak, J. A.; Colby, R. H.; Kamath, S. Y.; Kumar, S. K.; Stadler, R. Macromolecules 1998, 31, 8988-97.
Roland, C. M.; Ngai, K. L. Macromolecules 1992, 25, 363-367.
Zetsche, A.; Fischer, E. W. Acta Polymer 1994, 45, 168-175.
Ngai, K. L.; Roland, C. M. Macromolecules 1995, 28, 4033-35.
Kumar, S. K.; Colby, R. H.; Anastasiadis, S. H.; Fytas, G. J. Chem. Phys. 1996, 105, 3777-3788.
Alvarez, F.; Alegria, A.; Colmenero, J. Macromolecules 1997, 30, 597-604.
Alegria, A.; Colmenero, J.; Ngai, K. L.; Roland, C. M. Macromolecules 1994, 27, 4486-92.
Hadziioannou, G.; Stein, R. S. Macromolecules 1984, 17, 567-573.
Han, C. C.; Bauer, B. J.; Clark, J. C.; Muroga, Y.; Matsushita, Y.; Okada, M.; Tran-Cong, Q.; Chang, T.; Sanchez, I. C. Polymer 1988, 29, 2002-2014.
This website uses cookies to improve user experience. Read more
Save & Close
Accept all
Decline all
Show detailsHide details
Cookie declaration
About cookies
Strictly necessary
Performance
Strictly necessary cookies allow core website functionality such as user login and account management. The website cannot be used properly without strictly necessary cookies.
This cookie is used by Cookie-Script.com service to remember visitor cookie consent preferences. It is necessary for Cookie-Script.com cookie banner to work properly.
Performance cookies are used to see how visitors use the website, eg. analytics cookies. Those cookies cannot be used to directly identify a certain visitor.
Used to store the attribution information, the referrer initially used to visit the website
Cookies are small text files that are placed on your computer by websites that you visit. Websites use cookies to help users navigate efficiently and perform certain functions. Cookies that are required for the website to operate properly are allowed to be set without your permission. All other cookies need to be approved before they can be set in the browser.
You can change your consent to cookie usage at any time on our Privacy Policy page.