In Situ Synthesis of Incompatible Polymers within Hollow Porous Organic Nanosphere Networks for Cascade Reactions

Abstract

In the paper, the novel hollow porous organic nanosphere networks (H-PONNs) with remaining Z-type chain transfer agent (CTA) inside the cavity are synthesized via a hypercrosslinking mediated self-assembly method using the polystyrene-b-polylactide as precursors. The resultant Z-type CTA functionalized H-PONNs can be utilized to mediate reversible additionfragmentation chain transfer polymerization and the acidic or basic monomer (phenyl 4-vinylbenzene sulfonate (PVBS) , 4-N-(4-vinylbenzyl)-N-methylaminopyridine (VBMAP)) can be in situ polymerized in the cavity of nanospheres to produce acid/base-functionalized hollow porous organic nanosphere networks (poly(phenyl 4-vinylbenzene sulfonate) (PPVBS)/H-PONNs and poly(4-N-(4-vinylbenzyl)-N-methylaminopyridine) (PVBMAP)/H-PONNs). These PPVBS/H-PONNs and PVBMAP/H-PONNs possess the large surface area, hierarchically porous structure, and robust organic framework, which exhibit the excellent catalytic performance for acid-base cascade reactions. Furthermore, the turnover frequency is up to 51 h −1 that shows the catalysts have a great advantage over other similar materials for one-pot reactions.

EDTA Modified Hollow Microporous Organic Nanospheres for Enhancing Adsorption of Metal Ions

“…Hyper-crosslinked microporous polymers have been a family of scalable porous materials that has aroused striking attention owing to the high surface area, special pore structure, good stability and tunable chemical functionalities. [15] Recently, the functionalized hollow microporous organic nanospheres (HMONs) with carboxyl, [16] sulfonic, [17] amino, [18] and thiol groups, [19] can be prepared by hyper-crosslinking based on precursors modification, [20] one-pot method, [21] and postmodification, [22] which have been applied in multiple domains, such as catalysis, [23] adsorption, [24] electrochemistry. [25] Specially, the existence of the hollow cavity in HMONs could promote mass transfer and increase the chelating sites, which can greatly improve the adsorption performance with the simultaneous application of physical adsorption and chemical adsorption.…”

Cellulose-supported hyper-crosslinked l-tryptophan as an efficient chiral catalyst support for improved catalytic performance

“…Due to their ease of separation and potential for reuse, heterogeneous catalysts have attracted considerable attention. [4][5][6][7] However, because of the complexity of their synthetic reactions and difficulties in the regulation of the catalyst activity centers, [8][9][10] catalytically active centers cannot be fully utilized in synthesized heterogeneous catalysts. 11,12 As a novel porous organic polymer, hyper-crosslinked polymers (HCPs) have attracted considerable attention due to their unique properties, such as their large surface area, low skeletal density, and excellent chemical and thermal stability.…”