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Stress relaxation in symmetric ring-linear polymer blends at low ring fractions.

Publication ,  Journal Article
Parisi, D; Ahn, J; Chang, T; Vlassopoulos, D; Rubinstein, M
Published in: Macromolecules
March 2020

We combine linear viscoelastic measurements and modelling in order to explore the dynamics of blends of the same-molecular-weight ring and linear polymers in the regime of the low volume fraction (0.3 or lower) of the ring component. The stress relaxation modulus is affected by the constraint release (CR) of both rings and linear components due to the motion of linear chains. We develop a CR-based model of ring-linear blends that predicts the stress relaxation function in the low fraction regime of ring component in excellent agreement with experiments. Rings trapped by their entanglements with linear chains can only relax by linear-chain-induced constraint release, resulting in much slower relaxation of rings than of linear chains. The relative viscosity η ( ϕ R * ) / η L of the blend with respect to the linear melt viscosity ηL at ring overlap volume fraction ϕ R * increases proportionally to the square root of ring molecular weight M w , R . Our experimental results clearly demonstrate that it is possible to enhance the viscosity and simultaneously the structural relaxation time of linear polymer melts by adding a small fraction of ring polymers. These results not only provide fundamental insights into the physics of the CR process but also suggest ways to fine-tune the flow properties of linear polymers by means of adding rings.

Duke Scholars

Published In

Macromolecules

DOI

EISSN

1520-5835

ISSN

0024-9297

Publication Date

March 2020

Volume

53

Issue

5

Start / End Page

1685 / 1693

Related Subject Headings

  • Polymers
  • 40 Engineering
  • 34 Chemical sciences
  • 09 Engineering
  • 03 Chemical Sciences
 

Citation

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Parisi, D., Ahn, J., Chang, T., Vlassopoulos, D., & Rubinstein, M. (2020). Stress relaxation in symmetric ring-linear polymer blends at low ring fractions. Macromolecules, 53(5), 1685–1693. https://doi.org/10.1021/acs.macromol.9b02536
Parisi, Daniele, Junyoung Ahn, Taihyun Chang, Dimitris Vlassopoulos, and Michael Rubinstein. “Stress relaxation in symmetric ring-linear polymer blends at low ring fractions.Macromolecules 53, no. 5 (March 2020): 1685–93. https://doi.org/10.1021/acs.macromol.9b02536.
Parisi D, Ahn J, Chang T, Vlassopoulos D, Rubinstein M. Stress relaxation in symmetric ring-linear polymer blends at low ring fractions. Macromolecules. 2020 Mar;53(5):1685–93.
Parisi, Daniele, et al. “Stress relaxation in symmetric ring-linear polymer blends at low ring fractions.Macromolecules, vol. 53, no. 5, Mar. 2020, pp. 1685–93. Epmc, doi:10.1021/acs.macromol.9b02536.
Parisi D, Ahn J, Chang T, Vlassopoulos D, Rubinstein M. Stress relaxation in symmetric ring-linear polymer blends at low ring fractions. Macromolecules. 2020 Mar;53(5):1685–1693.
Journal cover image

Published In

Macromolecules

DOI

EISSN

1520-5835

ISSN

0024-9297

Publication Date

March 2020

Volume

53

Issue

5

Start / End Page

1685 / 1693

Related Subject Headings

  • Polymers
  • 40 Engineering
  • 34 Chemical sciences
  • 09 Engineering
  • 03 Chemical Sciences