Issue 13, 2021

Effect of precise linker length, bond density, and broad temperature window on the rheological properties of ethylene vitrimers

Abstract

Dynamic networks which undergo topology conserving exchange reactions, sometimes called vitrimers, show properties intermediate to thermosets and thermoplastics. The dynamic nature of the networks results in complex rheological properties and has attracted much attention in the past decade for self-healing, malleable and recyclable polymers. Here, we investigate a series of precise, high crosslink density telechelic ethylene vitrimers as a function of temperature and crosslink density. The networks show a rubbery plateau at high frequencies and a terminal flow regime at lower frequencies. With increasing crosslink density, the rubbery plateau modulus shows a monotonic increase and the terminal flow shifts to lower frequencies. The plateau modulus at high frequency increases as a function of temperature, as expected for a conserved network topology. When plotted against inverse temperature, the zero shear viscosities show a characteristic Arrhenius behavior, and the activation energy monotonically increases with crosslink density. Crossover frequency and shift factors (from time temperature superposition) also show Arrhenius behavior with activation energies in good agreement with those determined from zero shear viscosity. A positive deviation from this Arrhenius trend is observed beginning as high as 100 K above the glass transition temperature for C6 and C8 networks. Further investigations of such networks are critical for the development of sustainable and recyclable replacements for commercial plastics.

Graphical abstract: Effect of precise linker length, bond density, and broad temperature window on the rheological properties of ethylene vitrimers

Supplementary files

Article information

Article type
Paper
Submitted
26 avg 2020
Accepted
09 nov 2020
First published
24 nov 2020

Soft Matter, 2021,17, 3569-3577

Effect of precise linker length, bond density, and broad temperature window on the rheological properties of ethylene vitrimers

B. Soman and C. M. Evans, Soft Matter, 2021, 17, 3569 DOI: 10.1039/D0SM01544J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements