Jackson, Grayson L. published the artcileDesigning Stress-Adaptive Dense Suspensions Using Dynamic Covalent Chemistry, Synthetic Route of 15029-36-4, the publication is Macromolecules (Washington, DC, United States) (2022), 55(15), 6453-6461, database is CAplus and MEDLINE.
The non-Newtonian behaviors of dense suspensions are central to their use in technol. and industrial applications and arise from a network of particle-particle contacts that dynamically adapt to imposed shear. Reported herein are studies aimed at exploring how dynamic covalent chem. between particles and the polymeric solvent can be used to tailor such stress-adaptive contact networks, leading to their unusual rheol. behaviors. Specifically, a room temperature dynamic thia-Michael bond is employed to rationally tune the equilibrium constant (Keq) of the polymeric solvent to the particle interface. It is demonstrated that low Keq leads to shear thinning, while high Keq produces antithixotropy, a rare phenomenon where the viscosity increases with shearing time. It is proposed that an increase in Keq increases the polymer graft d. at the particle surface and that antithixotropy primarily arises from partial debonding of the polymeric graft/solvent from the particle surface and the formation of polymer bridges between particles. Thus, the implementation of dynamic covalent chem. provides a new mol. handle with which to tailor the macroscopic rheol. of suspensions by introducing programmable time dependence. These studies open the door to energy-absorbing materials that not only sense mech. inputs and adjust their dissipation as a function of time or shear rate but also can switch between these two modalities on demand.
Macromolecules (Washington, DC, United States) published new progress about 15029-36-4. 15029-36-4 belongs to amides-buliding-blocks, auxiliary class Nitrile,Amine,Aliphatic hydrocarbon chain,Amide, name is 2-Cyano-N-ethylacetamide, and the molecular formula is C5H8N2O, Synthetic Route of 15029-36-4.
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