Journal
CHEMICAL ENGINEERING JOURNAL
Volume 467, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2023.143434
Keywords
Supramolecular polyurethane; Quadruple hydrogen bonds; Impact protection; Strain-hardening; Self-healing
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Developing protective materials with intelligent and stimuli-responsive properties is essential for safety purposes. However, combining contradictory properties into a single polymer is challenging. In this study, a strain-hardening supramolecular polyurethane nanocomposite (SPN) with high mechanical strength and unique impact protection properties is synthesized by incorporating quadruple hydrogen bonds (H-bonds), disulfide bonds, and modified silica nanoparticles into polyurethane elastomer. This SPN material exhibits high energy absorption efficiency and impact protection properties through the dynamic break and re-form characteristic of quadruple H-bonds and the stress dissipation behavior of nanoparticles.
Developing protective materials with intelligent and stimuli-responsive properties is indispensable for safety protection. However, combining contradictory characteristics into a single polymer is challenging, such as high mechanical strength, impact protection, and self-healing properties. Herein, a strain-hardening supramolecular polyurethane nanocomposite (SPN) with high mechanical strength and unique impact protection characteristics is synthesized by incorporating quadruple hydrogen bonds (H-bonds), disulfide bonds, and modified silica nanoparticles into polyurethane elastomer. Benefiting from the dynamic break and re-form characteristic of quadruple H-bonds and the stress dissipation behavior of nanoparticles, SPN exhibits high energy absorption efficiency and impact protection properties. During the drop ball striking test, the impact energy absorption efficiencies reached 90%, and the buffer time of impact was significantly longer than common buffering mate-rials. The SPN exhibited excellent stretchability and self-healing ability, ascribing to disulfide metathesis and H -bonds association. Moreover, the prepared SPN could be easily processed through a hot press and showed negligible creeping. The developed SPN could serve as a novel self-standing impact protective material that offers promising prospects in sports, transportation, and aerospace fields.
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