Constraint Release Mechanisms for H-Polymers Moving in Linear Matrices of Varying Molar Masses

Lentzakis, Helen;Costanzo, Salvatore;Vlassopoulos, Dimitris;Colby, Ralph H.;van Ruymbeke, Evelyne;et.al.
(2019) Macromolecules — Vol. 52, n° 8, p. 3010-3028 (2019)

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Authors
  • Lentzakis, HelenInstitute of Electronic Structure & Laser, Heraklion, Foundation for Research and Technology Hellas (FORTH), Heraklion, Crete, Greece; Department of Materials Science & Technology, University of Crete, Heraklion, Crete, Greece
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  • Costanzo, SalvatoreInstitute of Electronic Structure & Laser, Heraklion, Foundation for Research and Technology Hellas (FORTH), Heraklion, Crete, Greece; Department of Materials Science & Technology, University of Crete, Heraklion, Crete, Greece
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  • Vlassopoulos, Dimitrisorcid-logoInstitute of Electronic Structure & Laser, Heraklion, Foundation for Research and Technology Hellas (FORTH), Heraklion, Crete, Greece; Department of Materials Science & Technology, University of Crete, Heraklion, Crete, Greece
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  • Colby, Ralph H.orcid-logoDepartment of Materials Science and Engineering, The Pennsylvania State University, University Park, State College, Pennsylvania, United States
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  • van Ruymbeke, Evelyneorcid-logoUCLouvain
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Abstract
We investigate the influence of the environment on the relaxation dynamics of well-defined H-polymers diluted in a matrix of linear chains. The molar mass of the linear chain matrix is systematically varied and the relaxation dynamics of the H-polymer is probed by means of linear viscoelastic measurements, with the aim to understand its altered motion in different blends, compared to its pure melt state. Our results indicate that short unentangled linear chains accelerate the relaxation of both the branches and the backbone of the H-polymers by acting as an effective solvent. On the other hand, the relaxation of the H-polymer in an entangled matrix is slowed-down, with the degree of retardation depending on the entanglement number of the linear chains. We show that this retardation can be quantified by considering that the H-polymers are moving in a dilated tube at the rhythm of the motion of the linear matrix.
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Lentzakis, H., Costanzo, S., Vlassopoulos, D., Colby, R. H., Read, D. J., Lee, H., Chang, T., & van Ruymbeke, E. (2019). Constraint Release Mechanisms for H-Polymers Moving in Linear Matrices of Varying Molar Masses. Macromolecules, 52(8), 3010-3028. https://doi.org/10.1021/acs.macromol.9b00251 (Original work published 2019)