Block Copolymer‐Directed Synthesis of Conjugated Polyimine Nanospheres with Multichambered Mesopores

Jiang, Xiangyu; Ai, Yan; Han, Zhuolei; You, Yuxiu; Luo, Hao; Cui, Jing; Wei, Facai; Fu, Jianwei; He, Qingguo; Cheng, Jiangong; Liu, Shaohua

doi:10.1002/macp.202000061

Cited by 7 publications

(2 citation statements)

References 40 publications

(41 reference statements)

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“…As shown in Fig. 4G , both OHMMCOF-1/OHMMCOF-2 exhibited IV-type characteristic nitrogen adsorption isotherms as well as H3-type hysteresis loop, indicating the presence of mesopores in the materials 67 . The BET surface areas of OHMMCOF-1/OHMMCOF-2 after removal of DTAB and OTAB increased to 170.8 and 112.2 m 2 /g compared to the OHMMCOF-DTAB/OHMMCOF-OTAB, respectively, which could be attributed to the removal of long-chain alkyl quaternary amine ions in the pores (Supplementary Fig.…”

Section: Resultsmentioning

confidence: 86%

Constructing ordered and tunable extrinsic porosity in covalent organic frameworks via water-mediated soft-template strategy

He,

Zou,

Chen

et al. 2024

Nat Commun

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As one of the most attractive methods for the synthesis of ordered hierarchically porous crystalline materials, the soft-template method has not appeared in covalent organic frameworks (COFs) due to the incompatibility of surfactant self-assembly and guided crystallization process of COF precursors in the organic phase. Herein, we connect the soft templates to the COF backbone through ionic bonds, avoiding their crystallization incompatibilities, thus introducing an additional ordered arrangement of soft templates into the anionic microporous COFs. The ion exchange method is used to remove the templates while maintaining the high crystallinity of COFs, resulting in the construction of COFs with ordered hierarchically micropores/mesopores, herein named OHMMCOFs (OHMMCOF-1 and OHMMCOF-2). OHMMCOFs exhibit significantly enhanced functional group accessibility and faster mass transfer rate. The extrinsic porosity can be adjusted by changing the template length, concentration, and ratio. Cationic guanidine-based COFs (OHMMCOF-3) are also constructed using the same method, which verifies the scalability of the soft-template strategy. This work provides a path for constructing ordered and tunable extrinsic porosity in COFs with greatly improved mass transfer efficiency and functional group accessibility.

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Section: Resultsmentioning

confidence: 86%

Constructing ordered and tunable extrinsic porosity in covalent organic frameworks via water-mediated soft-template strategy

He,

Zou,

Chen

et al. 2024

Nat Commun

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“…Polyimine (PI), is an emerging thermoset material, prepared by condensation of aldehyde and amine [ 11 , 12 , 13 , 14 , 15 ] (C=N, dynamic–covalent interaction of imine bonds) under mild reaction conditions. Unlike typical thermoset materials, PI has many remarkable properties, such as malleability, recyclability, and self-healing [ 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

High-Impact Performance and Thermal Properties of Polyimine Nanocomposites Reinforced by Silicon Carbide Nano-Whiskers

Zhang

Wang

et al. 2023

Materials

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Polymer nanocomposites, which combine the advantages of polymers and fillers, are widely used in the field of automobile and aviation. Polyimine (PI) is an emerging thermoset material with remarkable properties, such as malleability, recyclability, and self-healing. Silicon carbide nano-whiskers (SiCw), as a cheap and high-hardness filler material, are chosen to enhance the properties of polyimine matrix. Silicon carbide nano-whisker-reinforced polyimine (PI-SiCw) nanocomposites were successfully fabricated by heat pressing, which was confirmed by FTIR and XPS tests. According to the results of mechanical tests, the mechanical properties of PI-SiCw nanocomposites were obviously improved. For example, with the addition of 0.5% SiCw, bending strength and bending elongation at break can be simultaneously increased by 33% and 148%, respectively. Surprisingly, the impact strength of PI-SiCw nanocomposites with 2% SiCw was increased by 154% compared to the matrix. SEM and EDS tests showed that the evenly distributed SiCw in the polyimine matrix enhanced the mechanical properties of PI-SiCw nanocomposites according to the mechanism of whiskers pulling out and the bridging principle. According to the TGA test results, the PI composites with SiCw retain a higher weight percentage at 800 °C. The reason was the combined effect of the good thermal stability of SiCw and their strong interactions with the PI matrix. As a result, introducing SiCw into the PI matrix imparts a slight improvement in thermal stability. This article presents an avenue of cost-effective research to enhance the mechanical properties of polyimine composites.

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Controlled Synthesis of Mesoporous π‐Conjugated Polymer Nanoarchitectures as Anodes for Lithium‐Ion Batteries

Shi

et al. 2022

Macromol. Rapid Commun.

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Conjugated polymers possess better electron conductivity due to large𝝅-electron conjugated configuration endowing them significant scientific and technological interest. However, the obvious deficiency of active-site underutilization impairs their electrochemical performance. Therefore, designing and engineering 𝝅-conjugated polymers with rich redox functional groups and mesoporous architectures could offer new opportunities for them in these emerging applications and further expand their application scopes. Herein, a series of 1,3,5-tris(4-aminophenyl) benzene (TAPB)-based 𝝅-conjugated mesoporous polymers (𝝅-CMPs) are constructed by one-pot emulsion-induced interface assembly strategy. Furthermore, co-induced in situ polymerization on 2D interfaces by emulsion and micelles is explored, which delivers sandwiched 2D mesoporous 𝝅-CMPs-coated graphene oxides (GO@mPTAPB). Benefiting from specific redox-active functional groups, excellent electron conductivity and a 2D mesoporous conjugated framework, GO@mPTAPB exhibits high capability of accommodating Li + anions (up to 382 mAh g −1 at 0.2 A g −1 ) and outstanding electrochemical stability (87.6% capacity retention after 1000 cycles). The ex situ Raman and impedance spectra are further applied to reveal the high reversibility of GO@mPTAPB. This work will greatly promote the development of advanced 𝝅-CMPs-based organic anodes toward energy storage devices.

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Block Copolymer‐Directed Synthesis of Conjugated Polyimine Nanospheres with Multichambered Mesopores

Cited by 7 publications

References 40 publications

Constructing ordered and tunable extrinsic porosity in covalent organic frameworks via water-mediated soft-template strategy

Constructing ordered and tunable extrinsic porosity in covalent organic frameworks via water-mediated soft-template strategy

High-Impact Performance and Thermal Properties of Polyimine Nanocomposites Reinforced by Silicon Carbide Nano-Whiskers

Controlled Synthesis of Mesoporous π‐Conjugated Polymer Nanoarchitectures as Anodes for Lithium‐Ion Batteries

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