Mechanical properties of supramolecular elastomers prepared from polymer-grafted polyrotaxane

Supramolecular slide-ring (SR) elastomers without solvent were fabricated by cross-linking of polymer-grafted polyrotaxane in which α-cyclodextrins (CDs) with poly-ε-caprolactone (PCL) side chains are threaded on a polyethylene glycol (PEG) axial linear chain. The cross-links in the SR elastomers ar...

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Bibliographic Details
Published in:Polymer (Guilford) 2017-10, Vol.128, p.386-391
Main Authors: Minato, Kosuke, Mayumi, Koichi, Maeda, Rina, Kato, Kazuaki, Yokoyama, Hideaki, Ito, Kohzo
Format: Article
Language:English
Subjects:
Cellulose
Crosslinking
Cyclodextrin
Cyclodextrins
Elastomer
Elastomers
Grafting
Hydroxypropyl cellulose
Mechanical properties
Mechanical property
Modulus of elasticity
Polycaprolactone
Polyethylene glycol
Polymers
Polyrotaxane
Strain hardening
Supramolecule
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Summary:Supramolecular slide-ring (SR) elastomers without solvent were fabricated by cross-linking of polymer-grafted polyrotaxane in which α-cyclodextrins (CDs) with poly-ε-caprolactone (PCL) side chains are threaded on a polyethylene glycol (PEG) axial linear chain. The cross-links in the SR elastomers are capable of sliding along the backbone in response to applied stress. Mechanical properties of the SR elastomers with different cross-linking densities were compared with those of fixed cross-link (FC) elastomers prepared from PCL-grafted hydroxypropyl cellulose (HPC) to understand the influence of the slidable cross-links. The SR elastomers are found to undergo less strain-hardening at large strains and demonstrate higher strains at break than the conventional FC elastomers with the same Young's moduli. [Display omitted] •Supramolecular slide-ring (SR) elastomers exhibit smaller Young's moduli than fixed cross-link (FC) elastomers.•SR elastomers show less strain-hardening and larger strains at break compared with FC elastomers.•The softness and high deformability of SR elastomers are attributed to the slidability of the cross-links.
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2017.02.090