Hypercrosslinked Phenolic Polymers with Well‐Developed Mesoporous Frameworks

Abstract

A soft chemistry synthetic strategy based on a Friedel-Crafts alkylation reaction is developed for the textural engineering of phenolic resin (PR) with a robust mesoporous framework to avoid serious framework shrinkage and maximize retention of organic functional moieties. By taking advantage of the structural benefits of molecular bridges, the resultant sample maintains a bimodal micro-mesoporous architecture with well-preserved organic functional groups, which is effective for carbon capture. Moreover, this soft chemistry synthetic protocol can be further extended to nanotexture other arene-based polymers with robust frameworks.

No More HF: Teflon‐Assisted Ultrafast Removal of Silica to Generate High‐Surface‐Area Mesostructured Carbon for Enhanced CO2 Capture and Supercapacitor Performance

“…Theselectivity for CO 2 /N 2 separation (calculated from ratio of initial slopes) over JNC-1 at 25 8 8Cwas found to be about 7compared to 6o fC MK-3 and can be attributed to the presence of abundant micropores (Supporting Information, Figure S29) in the former. [6,32,33] Hydrogen uptake (2.8 wt %) of JNC-1 at Figure 3a)was also found to be higher than that of CMK-3 (1.2 wt %; Figure 3a;Supporting Information, Table S7) and is completely reversible throughout the pressure range studied. Thep resence of huge amount of micropores (40 %) having as ize of about 0.9 nm is within the accepted range of optimum micropore diameter for hydrogen storage (that is,b etween 0.5-1.5 nm) and contributes as sites of high energy of adsorption, thereby maximizing the uptake.…”

“…Periodic mesoporous carbon [1,2] materials have generated agreat deal of technological interest by virtue of their ability to overcome the mass-transport limitations encountered in their disordered counterparts [3] and thus play asignificant role in the area of catalysis (as as upport), [4] Li-S batteries, [5] gas separation and storage, [6,7] and electric double-layer capacitors (EDLC). [8] In contrast to disordered pore architectures, ordered nanoporous structures provide shorter diffusion pathways and minimal resistance to molecular motion, which improves transport properties.…”

Conjugated Polymers: Catalysts for Photocatalytic Hydrogen Evolution

“…Organic conjugated photocatalysts have more advantages, including being light-weight, low cost, sustainability,a ccessibility,a nd processibility,i nc omparison with their inorganic counterparts.R ecently,n umerous organic conjugated polymers with promising properties have been successfully fabricated for photocatalytic H 2 evolution, thus resulting in enhanced photocatalytic activities.T he AQYf or photocatalytic H 2 evolution can be increased from 0.015 to 38.8 %atl = 420 nm after rational modification in the syntheses,structures, and properties of the conjugated polymers,and is comparable and even better than some inorganic photocatalysts.Itisclear that the organic conjugated semiconductors hold great promise for solar-energy utilization as ar esult of the unique advantage of structure and property modification to favor the photocatalytic H 2 evolution reactions.T he development of new organic conjugated photocatalysts (including hypercrosslinked polymers as at ypical example) [40] and further improvements in the activities are therefore highly envisaged. Am ain drawback of highly-crosslinked conjugated photocatalysts is their inherently poor dispersion in water.…”

Membrane‐Based Gas Separation Accelerated by Hollow Nanosphere Architectures

“…As the HCS loading increases, the polymeric matrix becomes more opaque owing to the black color of the HCSs; and complete blocking of the image is observed when the loading reaches 30 wt%. The incorporation of HCSs into the MMMs gives rise to two broad peaks at 1350 and 1600 cm −1 , known as the D band and G band of carbon, [56] consistent with the amorphous structure of the HCSs. [38,54] Block copolymers such as PS-PEB-PS can exhibit microphase-separated, long-range structure consisting of rubbery, or soft, PEB domains and glassy, or rigid, PS domains that impart both high permeation and mechanical strength.…”

“…Despite the reduction in selectivity, the performance of the 40 wt% HCS@PS-PEB-PS membrane remained sufficient for gas separation in industrial-scale applications. [56] For pristine HCSs, the CO 2 uptake was 11.6 wt% with an ideal CO 2 /N 2 adsorption selectivity of 30.3 suggesting the use of carbon spheres in MMM fabrication (Figure 3d and Figure S18, Supporting Information). In this case, the gas molecules rapidly diffused through the interparticle voids, leading to a significant loss of selectivity.…”