Synthetic control of network topology and pore structure in microporous polyimides based on triangular triphenylbenzene and triphenylamine units

Yang

2013

Chemistry A European J

This article describes the synthesis and functions of phosphine or phosphine oxide functionalized networks (PP-P or PP-PO; PP = porous polymer). These materials were predominantly microporous and exhibited high surface areas (S(BET): 1284 and 1353 m(2) g(-1) for PP-P and PP-PO, respectively), with high CO2 (2.46 and 3.83 mmol g(-1) for PP-P and PP-PO, respectively) uptake capacities. Pd nanoparticles can be simply incorporated into the functionalized networks (PP-P-Pd or PP-PO-Pd) through a facile one-step impregnation. A yield of 98 % was obtained in the Suzuki reaction between 1-chlorobenzene and p-tolylboronic acid with the PP-P-Pd system, which was higher than that obtained when PP-PO-Pd (53.2 %) or [Pd(PPh3)4] (38.2 %) was used as the catalyst. The superior catalytic ability of PP-P-Pd can be attributed to the structural features that incorporate triarylphosphine within a microporous structure.

Section: Resultsmentioning

confidence: 87%

Novel Functionalized Microporous Organic Networks Based on Triphenylphosphine

Yang

2013

Chemistry A European J

“…Nitrogen adsorption-desorption isotherms were measured to analyze the porous properties of microporous polymers. 19,27,28 The surface areas of P1 to P4 calculated by the Brunauer-Emmett-Teller (BET) method in the relative pressure (P/P 0 ) range from 0.05 to 0.20 are 68.65 m 2 g À1 , 878.46 m 2 g À1 , 621.18 m 2 g À1 and 660.62 m 2 g À1 , respectively (Fig. 3b).…”

Section: Pore Properties Analysismentioning

confidence: 99%

Effect of two facile synthetic strategies with alterable polymerization sequence on the performance of N-vinyl carbazole-based conjugated porous materials

Huang

Wang

et al. 2014

RSC Adv.

Four (N-vinyl carbazole)-based polymers were prepared through two facile synthetic strategies including both free radical polymerization and oxidative polymerization in different sequences. N-vinyl carbazole containing an ethylenic bond and a carbazole group is a superior candidate to study the effects of polymerization methods and sequences on the performance of conjugated microporous materials (CMPs). P2 was obtained with a BET of 878.46 m 2 g À1 , 12.8 times that of P1 (68.65 m 2 g À1) in path 1, whereas in path 2, P3 (621.18 m 2 g À1) and P4 (660.62 m 2 g À1) were obtained without obvious difference in surface areas and pore structure. The dominant pore of linear polymer P1 centered at 3.94 nm, which is consistent with the polymers of intrinsic microporous (PIMs) analogues, and the counterparts P2 (ultramicropores, 0.54 nm), P3 (1.13 nm), and P4 (1.17 nm) are typical CMPs. P2 shows the best gas uptake abilities and absorbancies for organic solvents among the polymers. The results demonstrate that polymerization methods and sequences can have a great influence on the performance of materials, and only by careful choice of polymerization method and fine adjustment of the polymerization sequence can one obtain conjugated porous materials with optimum performance. Path 1, which is cost effective, high yielding and pollution free, should be regarded as the optimum selection process to prepare the Nvinyl carbazole-based porous materials. The reusability of P2 and P4 shows their impressive stability after 5 cycles of use or acid/base treatment. It is worth noting that P2 and P4 with a high porosity and pore volume are promising materials in carbon dioxide uptake, and in methane and hydrogen storage.

Green Chemistry and Sustainable Technology

“…5.15, A9) [122, (Fig. 5.15, A5) [124] were also used to produce the porous polyimide, which packed space inefficiently due to its central carbon or nitrogen. These networks exhibited a BET surface area up to 2,213 m 2 g −1 [125].…”

Section: Polymers Of Intrinsic Microporositymentioning

confidence: 99%

Microporous Organic Polymers for Carbon Dioxide Capture

Luo

Tan

2014

Microporous organic polymers (MOPs) are a unique class of porous materials consisting solely of the light elements (C, H, O, N, etc.). A series of vivid characteristics of MOPs, such as high-specific surface area, good physicochemical stability, diverse pore dimensions, topologies, and chemical functionalities, make them suitable adsorbents for CO 2 capture. In this chapter, MOPs are categorized into four classes according to the types of organic reactions and the chemical structures of the resulting materials: hypercrosslinked polymers (HCPs), covalent organic frameworks (COFs), polymers of intrinsic microporosity (PIMs), and conjugated microporous polymers (CMPs). For each type of the polymer network, the state-of-the-art development in the design, synthesis, characterization, and the CO 2 sorption performance is reviewed. Strategies for controlling CO 2 uptake capacity and adsorption enthalpy via manipulation of surface area, pore size, and functionality are discussed in detail. These studies would open up many new possibilities for the development of the novel solid sorbents targeting the CO 2 capture process. It is expected that this chapter will not only summarize the main research activities in this field, but also find possible links between basic studies and practical applications. Abbreviations ACMPAcetylene gas mediated conjugated microporous polymers BA Benzyl alcohol BC Benzyl chloride BCMA 9,10-Bis(chloromethyl)anthracene