Enhanced thermomechanical property of a self-healing polymer via self-assembly of a reversibly cross-linkable block copolymer

We report the preparation and thermomechanical properties of hetero-nanostructured self-healing polymers (HSPs) bearing a hindered urea bond (HUB) by varying the content of a self-healable block copolymer (BCP). The micellar morphology of the BCP blend in a matrix polymer was studied using transmiss...

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Bibliographic Details
Published in:Polymer chemistry 2020-06, Vol.11 (22), p.3701-3708
Main Authors: Lee, Hyang Moo, Perumal, Suguna, Kim, Gi Young, Kim, Jin Chul, Kim, Young-Ryul, Kim, Minsoo P., Ko, Hyunhyup, Rho, Yecheol, Cheong, In Woo
Format: Article
Language:English
Subjects:
Atomic force microscopy
Block copolymers
Crosslinking
Dynamic mechanical analysis
Mechanical properties
Microscopy
Morphology
Optical microscopy
Polymer chemistry
Polymers
Rheometry
Scratch tests
Self healing materials
Self-assembly
Small angle X ray scattering
Thermomechanical properties
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Summary:We report the preparation and thermomechanical properties of hetero-nanostructured self-healing polymers (HSPs) bearing a hindered urea bond (HUB) by varying the content of a self-healable block copolymer (BCP). The micellar morphology of the BCP blend in a matrix polymer was studied using transmission electron microscopy and grazing-incidence small-angle X-ray scattering with various organic solvent types and BCP contents. The self-healing efficiency of the HSPs was obtained from single-scratch tests through optical microscopy and atomic force microscopy. To confirm self-healing at the molecular level, the mechanical properties of the cross-cut and healed HSPs were also analyzed using a universal testing machine. Thermomechanical properties associated with HUB were measured by dynamic mechanical analysis and temperature-oscillating rheometry. The results showed that blending the BCP improved the toughness, the hardness, and the modulus up to 21.7, 25.3, and 24.8%, respectively. Moreover, at high temperatures, the temperature range of the rubbery plateau was greatly widened without a noticeable decrease in the self-healing capability.
ISSN:1759-9954
1759-9962
DOI:10.1039/D0PY00310G