Synthesis and Gas Sorption Properties of Microporous Poly(arylene ethynylene) Frameworks
Received date: 2017-02-17
Online published: 2017-04-12
Supported by
Project supported by the the Natural Science Foundation of China (No. 51103111) and the Education Ministry of China (No. NCET-12-0714).
Microporous organic polymers (MOPs) have drawn much attention because of their potential applications such as gas storage, separation and heterogeneous catalysis. There is great interest in the design, synthesis and property evaluation of poly(arylene ethynylenes) (PAEs) with intrinsic microporosity. In addition to Sonogashira coupling reaction between terminal alkynes and halides, the oxidative dimerization of terminal alkynes is an alternating strategy for the buildup of the microporous PAE frameworks. In this paper, a series of MOPs were synthesized by the oxidative dimerization of terminal alkynes using triethynyl monomers such as tris(4-ethynylphenyl)amine, tris(4-ethynylphenyl)methylsilane and polytris(4-ethynylphenyl)phenylsilane. The resulting MOPs were characterized by FT-IR spectra, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), powder X-ray diffraction (PXRD) measurements. FT-IR spectra indicate the success of the homocoupling reaction for constructing the dialkyne-bridged polymer frameworks. These polymer frameworks exhibit high thermal stability with onset of decomposition temperature above 350 ℃ at 5% mass loss under nitrogen flow. PXRD and TEM measurements revealed that all the polymer frameworks are amorphous solid in nature. These dialkyne-bridged MOPs exhibit moderate surface areas ranging from 602 to 715 m2·g-1. The incorporation of triphenylamine moieties into the polymer skeleton increases the number of electron donating basic nitrogen sites in the porous frameworks. Thus, the triphenylamine-based polymer polytris(4-ethynylphenyl)amine (TEPA-MOP) with the highest Brunauer-Emmett-Teller (BET) surface area shows the highest CO2 uptake capacity of 1.59 mmol·g-1 at 273 K and 1.13 bar among the resulting polymer frameworks. In addition, TEPA-MOP showed the highest H2 adsorption up to 1.04 wt% at 1.13 bar and 77 K and polytris(4-ethynylphenyl)phenylsilane (TEPP-MOP) displayed the lowest H2 adsorption of 0.64 wt% at the same conditions. As for separation of CO2, both TEPA-MOP and TEPP-MOP exhibit relatively high CO2-over-N2 selectivities of 69.9 and 73.2 at 273 K, respectively. The above results show that TEPA-MOP might be the good candidate for the balanced CO2 uptake capacity with impressive CO2/N2 selectivity among the microporous PAE frameworks.
Xu Jiawei , Zhang Chong , Wang Xunchang , Jiang Jiaxing , Wang Feng . Synthesis and Gas Sorption Properties of Microporous Poly(arylene ethynylene) Frameworks[J]. Acta Chimica Sinica, 2017 , 75(5) : 473 -478 . DOI: 10.6023/A17020068
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