Rheology and Rupture of Partial Vitrimer
ORAL
Abstract
Polymer network with dynamic covalent bonds, also known as vitrimer, exhibit interesting mechanical behaviors which are very different from conventional polymers. Because of the bond exchanging reactions, vitrimers have shown great potential as excellent recyclable polymers with self-healing capability. Our recent experiments have shown that the mechanical properties of a vitrimer such as fracture toughness and stress relaxation can be greatly tuned by selectively mixing the polymer chains with dynamic covalent bonds and routine covalent bonds (referred as partial vitrimer), while the self-healing capability of the polymer can be still maintained. To quantitatively understand the stress relaxation of the partial vitrimer, we developed a simple rheological model for it with certain combinations of spring and dashpot. We have also developed a simple energy argument to explain the rupture phenomenon of vitrimer under different mechanical loading conditions.
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Presenters
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Shengqiang Cai
University of California, San Diego, Department of Mechanical and Aerospace Engineering, University of California San Diego, Mechanical and Aerospace Engineering, University of California, San Diego
Authors
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Shengqiang Cai
University of California, San Diego, Department of Mechanical and Aerospace Engineering, University of California San Diego, Mechanical and Aerospace Engineering, University of California, San Diego