Detachable Porous Organic Polymers Responsive to Light and Heat

Abstract

Stimuli-responsive porous materials have captured much attention due to the on-demand tunable properties. Most reported stimuli-responsive porous materials are based on molecule isomerism or host-guest interaction, and it is highly desired to develop new types based on different responsive mechanism. Herein, inspired by natural cells which have the ability to fuse and divide induced by external stimulation, we report a new type of stimuli-responsive porous material based on detachment mechanism. A detachable porous organic polymer, namely DT-POP-1, is fabricated from the polymerization of anthracene-containing monomer (AnMon) when irradiated by 365 nm UV light. DT-POP-1 can detach into the monomer AnMon when irradiated with 275 nm UV light or heat. Such polymerization/detachment is reversible. The detachment results in a big difference in porosity and adsorption capacity, making the present detachable porous polymer highly promising in adsorptive separation and drug delivery.

Magnetic ionic crystals with light controllable mobility and CO2 physisorption/desorption

“…It leverages an alternative driving force to achieve CO 2 physisorption/desorption, which was previously reported to be based on a stimuli-responsive detachment mechanism. 14 This research shows that the supramolecular interplay in ionic liquids is quite an efficient toolbox to conjugate stimuli materials, which can respond to external stimuli at the fundamental level due to the existence of noncovalent interactions of each stimuli-responsive component.…”

Novel Porous Organic Polymer Catalyst with Phosphate and Sulfonic Acid Sites for Facile Esterification of Levulinic Acid

“…Porous organic polymers (POPs) containing covalent linkages of organic precursors exhibit a high surface area, a tunable backbone, excellent physicochemical stability, and flexibility for rational design. Hence, they have been used in catalysis, adsorption, gas separation, sensor, proton conductor, and energy storage. − In particular, surface-functionalized POPs have shown potential as catalysts for biomass conversion. − Ravi et al converted fructose to 5-hydroxymethylfurfural (HMF) over novel phosphate-functionalized POPs with strong acidic sites, large surface areas, and high mesoporosity . Du et al introduced sulfonic acids into the aromatic sites of POP to catalyze fructose conversion to HMF .…”

Extraction of Uranium by a Cheap Phosphite-Derived Polymer under Light Condition

“…Phosphate esters have attracted much attention because of their unique affinity to uranium. − Porous organic polymer, due to its adjustable pore size and high specific surface area, can be loaded with phosphate groups onto the skeleton by direct modification or postmodification to achieve the adsorption of uranium. , Hua et al, − by preparing an imprinting chamber with a phosphonate ligand on a silica medium to realize the selective adsorption of uranium, also functionalized silica and MoS 2 sheet with phosphoric acid to achieve the efficient adsorption of uranium in aqueous solutions. Yan et al reported a postsynthetic modification method to synthesize two benzoxazole-linked covalent organic frameworks decorated with abundant phosphonic groups for uranium adsorption.…”