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Journal article
Effect of Hydrogen Bonding on Linear and Nonlinear Rheology of Entangled Polymer Melts
Macromolecules, v 48(16), pp 5988-5996
25 Aug 2015
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Supramolecular polymers are used in many applications such as adhesives, coatings, cosmetics, and printing. Characterizing the dynamics of such polymers is essential for tailoring user defined properties in products and applications. We present both linear and nonlinear rheological results for a model system of pure poly(n-butyl acrylate), PnBA, homopolymer and four PnBA poly(acrylic acid), PnBA , copolymers with different number of AA side groups. The copolymers are synthesized via hydrolysis of the pure PnBA homopolymer. Therefore, all polymers studied have the same backbone length. The number of AA side groups (hydrogen-bonding groups) after hydrolysis is determined from NMR measurements. We show that using the theoretical dependency of modulus and reptation time on the packing length, we can account for the changes in linear viscoelasticity due to transformation of nBA side groups to AA along the backbone. Assuming superposition holds and subtracting out the linear chain rheology from LVE, the hydrogen bonding contribution to LVE is exposed. Hydrogen bonding affects linear viscoelasticity at frequencies below the inverse reptation time. More specifically, the presence of hydrogen bonds causes G' and G" as a function of frequency to shift to a power law scaling of 0.5. Furthermore, the magnitude of G' and G" scales linearly with the number of hydrogen-bonding groups. The nonlinear extensional rheology shows extreme strain hardening. The magnitude of extensional stress has a strongly nonlinear dependence on the number of hydrogen-bonding groups. These results are aimed at uncovering the molecular influence of hydrogen bonding on linear and nonlinear rheolog to aid future molecular synthesis and model development.
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Details
- Title
- Effect of Hydrogen Bonding on Linear and Nonlinear Rheology of Entangled Polymer Melts
- Creators
- Aamir Shabbir - Technical University of DenmarkHadi Goldansaz - Université Catholique de LouvainOle Hassager - Technical University of DenmarkEvelyne van Ruymbeke - Université Catholique de LouvainNicolas J. Alvarez - Drexel University
- Publication Details
- Macromolecules, v 48(16), pp 5988-5996
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 9
- Grant note
- FRIA; Fonds de la Recherche Scientifique - FNRS 607937 / People Programme (Marie Curie Actions) of European Union's Seventh Framework Programme under REA grant
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000360324400061
- Scopus ID
- 2-s2.0-84940062586
- Other Identifier
- 991019167879904721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Polymer Science