Effect of crosslinker 3-methacryloxypropylmethyldimethoxysilane on UV-crosslinked PDMS-PTFPMS block copolymer membranes for ethanol pervaporation

Liu, Chang; Xue, Tanlong; Yang, Yinhua; Ouyang, Jinbo; Chen, Huidong; Yang, Shuai; Li, Guozhen; Cai, Di; Si, Zhihao; Li, Shufeng; Qin, Peiyong

doi:10.1016/j.cherd.2021.01.023

Cited by 19 publications

(2 citation statements)

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“…The swelling degrees of the PDMS-based membrane in ethanol and in water are key parameters to measure the structural stability and affinity of ethanol (or water) for the PV membrane . As shown in Figure b, the swelling of all of the membranes in ethanol is greater than that in water, indicating that the PDMS had a strong affinity of ethanol.…”

Section: Resultsmentioning

confidence: 99%

“…41,42 The swelling degrees of the PDMS-based membrane in ethanol and in water are key parameters to measure the structural stability and affinity of ethanol (or water) for the PV membrane. 43 As shown in Figure 10b, the swelling of all of the membranes in ethanol is greater than that in water, indicating that the PDMS had a strong affinity of ethanol. The PDMS MMMs exhibit higher ethanol swelling than that of the pure PDMS membrane, indicating that the MMMs have enhanced ethanol affinity due to the adsorption sites of the nanoparticles.…”

Section: Industrial and Engineeringmentioning

confidence: 88%

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Enhanced Pervaporation of the Poly(dimethylsiloxane) (PDMS) Mixed Matrix Membrane Based on the Self-Assembly of Multidimensional Carbon Nanomaterials

Xu,

Wang,

Liu

et al. 2023

Ind. Eng. Chem. Res.

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Introducing nanomaterials in the poly-(dimethylsiloxane) (PDMS)-based membranes and constructing preferential ethanol-permeable nanochannels are important to improve the pervaporation (PV) flux and selectivity in the separation of the ethanol/water binary system. In this work, poly-(vinylpyrrolidone) (PVP)-modified carbon nanotubes (P-CNTs) and reduced graphene oxide (rGO) nanosheets were incorporated in the PDMS membrane's matrix simultaneously. Various analysis methods, such as scanning electron microscopy (SEM), highresolution field emission transmission electron microscope (HR-FETEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), and thermogravimetric analyzer (TGA), were introduced to explore the physical structure of the P-CNTs@rGO nanoparticles and their valuable chemical properties in the PDMS matrix. The surface (and cross-section) morphology, surface chemical bond, surface roughness, contact angle, swelling degree, and apparent activation energy of the PDMS-based membranes before and after the P-CNTs@rGO loading were thoroughly characterized and analyzed. Primarily based on the particles' charge repulsion and steric hindrance effect originating from the PVP molecular chains, the agglomeration of the CNT nanotubes and rGO nanosheets was inhibited, which was consistent with other reports. The CNTs and rGO were homogeneously dispersed and self-assembled into multidimensional nanoparticles, which formed preferential channels for ethanol permeation in the PDMS membrane matrix. As a result, the total flux of the prepared P-CNTs@rGO/PDMS mixed matrix membrane (MMM) reached 3.40 kg•m −2 •h −1 , the ethanol/water separation factor remained 12.40, and the pervaporation separation index (PSI) remained 38.76 at 50 °C. Meanwhile, the PV performances and the apparent activation energies of ethanol and water permeation for the pure PDMS membrane and the P-CNTs/PDMS, rGO/PDMS, and P-CNTs@rGO/PDMS MMMs were also investigated. The P-CNTs@rGO/PDMS MMM showed high competitiveness with other PDMS-based membranes in the PV process. Moreover, the three-dimensional (3D) network formed by the P-CNTs@rGO nanofillers and the polymer chains stabilized the membrane structure and maintained a high-performance operation at 50 °C for a total duration of 140 h.

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Section: Resultsmentioning

confidence: 99%