Journal
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
Volume 53, Issue 13, Pages 899-906Publisher
WILEY
DOI: 10.1002/polb.23716
Keywords
branched; glassy polymers; macromonomers; rheology; viscoelastic properties; viscosity
Categories
Funding
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-FG02-05ER46218]
- National Science Foundation [DMR-1207070]
- John R. Bradford Endowment at Texas Tech University
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The linear rheological responses of a series of specially designed wedge-type polymers synthesized by the polymerization of large molecular weight monomers have been measured. These wedge polymers contained large side groups which contained three flexible branch chains per polymer chain unit. The master curves for these polymers were obtained by time temperature superposition of dynamic data at different temperatures from the terminal flow regime to well below the glass transition temperature, T-g. While these polymers maintained a behavior similar to that of linear polymers, the influence of the large side group structure lead to low entanglement densities and extremely low rubbery plateau modulus values, being near to 13 kPa. The viscosity molecular weight dependence was also somewhat higher than that normally observed for linear polymers, tending toward a power law near to 4.2 rather than the typical 3.4 found in entangled linear chains. The glassy modulus of these branched polymers is also found to be extremely low, being less than 100 MPa at T-g -60 degrees C. (c) 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 53, 899-906
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