scholarly journals Enhanced gas separation and mechanical properties of fluorene-based thermal rearrangement copolymers

RSC Advances ◽  
2021 ◽  
Vol 11 (22) ◽  
pp. 13164-13174
Author(s):  
Jianhua Zhang ◽  
Yunhua Lu ◽  
Guoyong Xiao ◽  
Mengjie Hou ◽  
Lin Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Gas Separation ◽  
Thermal Rearrangement

The fluorene-based thermal rearrangement copolymers exhibited excellent gas separation and mechanical properties.

A poly(arylene ether sulfone) hybrid membrane using titanium dioxide nanoparticles as the filler

2016 ◽  
Vol 29 (1) ◽  
pp. 26-35 ◽  
Author(s):  
Yunwu Yu ◽  
Wenhao Pan ◽  
Xiaoman Guo ◽  
Lili Gao ◽  
Yaxin Gu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Titanium Dioxide ◽  
Gas Separation ◽  
Proton Nuclear Magnetic Resonance ◽  
Separation Performance ◽  
Hydroxyl Groups ◽  
Hybrid Membranes ◽  
Permeability Coefficients ◽  
Arylene Ether ◽  
The Matrix

Poly(arylene ether sulfone) (PES)–titanium dioxide (TiO2) hybrid membranes were prepared via solution blending method using TiO2 nanoparticles as inorganic filler. The chemical structure and thermal stability of the matrix polymer were characterized by proton nuclear magnetic resonance, Fourier transform infrared, differential scanning calorimetry, and thermogravimetric analysis. The crystal structure, morphology, mechanical properties, and gas separation performance of hybrid membranes were characterized in detail. As shown in scanning electron microscopic images, TiO2 nanoparticles dispersed homogeneously in the matrix. Although the mechanical properties of hybrid membranes decreased certainly compared to the pure PES membranes, they are strong enough for gas separation in this study. All gas permeability coefficients of PES-TiO2 hybrid membranes were higher than pure PES membranes, attributed to the nanogap caused by TiO2 nanoparticles, for instance, oxygen and nitrogen permeability coefficients of Hybrid-3 (consists of PES with 4-amino-phenyl pendant group and hexafluoroisopropyl (Am-PES)-20 and TiO2 nanoparticles, 5 wt%) increased from 2.57 and 0.33 to 5.88 and 0.63, respectively. In addition, the separation factor increased at the same time attributed to the stimulative transfer effect caused by the interaction of hydroxyl groups on the TiO2 nanoparticle and polar carbon dioxide molecules.

Highly gas permselective polyetherketone hollow fibre membranes using aqueous sulfuric acid solution as coagulant

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Jiping Yang ◽  
Philip J Brown
Keyword(s):  
Mechanical Properties ◽  
Sulfuric Acid ◽  
Acid Solution ◽  
Gas Separation ◽  
Sulfuric Acid Solution ◽  
Hollow Fibre ◽  
Injection Rate ◽  
Fluid Injection ◽  
Aqueous Sulfuric Acid ◽  
Membrane Morphology

AbstractHollow fibre membranes with more sponge-like morphology and improved gas permeation performance were spun from 20% polyetherketone (PEK) /sulfuric acid (H2SO4) dope solution with aqueous sulfuric acid solution as coagulant using dry-jet wet spinning process. The membrane morphology, mechanical properties and gas separation performance (hydrogen, methane and carbon dioxide) of as-spun PEK hollow fibres have been measured using SEM, Instron and gas test rig. Better cross section structures and mechanical properties in as-spun PEK hollow fibres were observed when aqueous sulfuric acid solution replaced water as coagulant (internal and external). The hydrogen/methane selectivity of up to 40 and hydrogen permeation rate of 3.65 GPU obtained in PEK hollow fibre membranes using 30% sulfuric acid solution as internal and external coagulant simultaneously at the bore fluid injection rate of 30 ml/h are higher than those reported in literatures. Furthermore the effects of bore fluid injection rate and various coagulants on the membrane morphology, mechanical properties and gas separation properties were investigated, as well.

scholarly journals Comprehensive detection device and physical testing for mechanical properties of seabed sediments and shallow gas

2021 ◽  
Vol 2083 (2) ◽  
pp. 022105
Author(s):  
Zhe Yun Li ◽  
Qing Li
Keyword(s):  
Mechanical Properties ◽  
Real Time ◽  
Gas Separation ◽  
Sensor Placement ◽  
Gas Detection ◽  
Shallow Gas ◽  
Seabed Sediment ◽  
Transmission Part ◽  
Seabed Sediments ◽  
Water Gas

Abstract In this paper, a comprehensive detection device for the mechanical properties of seabed sediments and shallow gas is designed, which is mainly composed of the seabed sediment mechanical properties detection part, the shallow gas detection part and the ultrasonic wireless transmission part. The mud water gas separation structure of the shallow gas detection part separates the shallow gas from the mud water, and then the methane concentration in the shallow gas is measured by the non-dispersive infrared methane sensor, which realizes the collection of the submarine shallow gas and the automatic real-time monitoring of the concentration. The measurement of the mechanical properties of seabed sediments realizes the real-time measurement of the three parameters of cone resistance, sidewall friction and pore water pressure, which characterize the mechanical properties of seabed sediments, through strain-sensitive elements. The ultrasonic wireless data transmission part is mainly for the data detected by the mechanical properties of the seabed sediments to be wirelessly transmitted to the sensor placement room through the ultrasonic transducer across the mud-water-gas separation structure. Finally, the data measured by the two parts are transmitted to the mother ship through the cable located in the sensor placement room. The experimental results show that it has the ability to comprehensively detect the mechanical properties of seabed sediments and shallow gas, and has strong operability.

scholarly journals Gas separation membranes made through thermal rearrangement of ortho-methoxypolyimides

RSC Advances ◽  
2015 ◽  
Vol 5 (124) ◽  
pp. 102261-102276 ◽  
Author(s):  
Bibiana Comesaña-Gándara ◽  
José G. de la Campa ◽  
Antonio Hernández ◽  
Hye Jin Jo ◽  
Young Moo Lee ◽  
...  
Keyword(s):  
Gas Separation ◽  
Thermal Rearrangement ◽  
Separation Membranes ◽  
Gas Separation Membranes

ortho-Methoxypolyimides were prepared from 3,3ʹ-dimethoxybenzidine (DMAB) and hexafluoroisopropylidene diphthalic anhydride (6FDA).

scholarly journals The Preparation and Properties of Nanocomposite from Bio-Based Polyurethane and Graphene Oxide for Gas Separation

Nanomaterials ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 15 ◽  
Author(s):  
Yongsheng Zhang ◽  
Jun Ma ◽  
Yao Bai ◽  
Youwei Wen ◽  
Na Zhao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Gas Separation ◽  
Hybrid Film ◽  
Gas Permeability ◽  
Chain Extension ◽  
Gravimetric Analysis ◽  
Elongation At Break ◽  
Tung Oil ◽  
Thermal Stability Of

Petroleum depletion and climate change have inspired research on bio-based polymers and CO2 capture. Tung-oil-based polyols were applied to partially replace polyether-type polyols from petroleum for sustainable polyurethane. Tung-oil-based polyurethane (TBPU), was prepared via a two-step polycondensation, that is, bulk prepolymerization and chain extension reaction. The graphene oxide (GO) was prepared via Hummer’s method. Then, TBPU was composited with the GO at different ratios to form a TBPU/GO hybrid film. The GO/TBPU films were characterized by fourier transform infrared spectroscopy (FTIR), differential scanning calorimeter (DSC), thermal gravimetric analysis (TGA) and scanning electron microscope (SEM), followed by the measurement of mechanical properties and gas permeability. The results showed that the addition of tung-oil-based polyols enhanced the glass transition temperature and thermal stability of TBPU. The mechanical properties of the hybrid film were significantly improved, and the tensile strength and elongation at break were twice as high as those of the bulk TBPU film. When the GO content was higher than 2.0%, a brittle fracture appeared in the cross section of hybrid film. The increase of GO content in hybrid films improved the selectivity of CO2/N2 separation. When the GO content was higher than 0.35%, the resulting GO agglomeration constrained the gas separation and permeation properties.

Poly(imide-siloxane)s based on hyperbranched polyimides

e-Polymers ◽  
2018 ◽  
Vol 18 (2) ◽  
pp. 105-110 ◽  
Author(s):  
Petr Sysel ◽  
Anna Patrova ◽  
Marek Lanc ◽  
Karel Friess
Keyword(s):  
Mechanical Properties ◽  
Carbon Dioxide ◽  
Gas Separation ◽  
Molar Mass ◽  
Average Molar Mass ◽  
Hyperbranched Polyimides ◽  
Poly Imide ◽  
Oxydiphthalic Anhydride

AbstractPoly(imide-siloxane)s differing in their composition were prepared and characterized. The starting polymer (control) was the hyperbranched polyimide based on 4,4′-oxydiphthalic anhydride and 4,4′,4″-triaminotriphenylmethane. In the poly(imide-siloxane)s, 10 or 40–50 mol% of the 4,4′,4″-triaminotriphenylmethane was theoretically substituted for by amine-terminated siloxane dimer or oligomers. 1,3-Bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, bis(3-aminopropyl)-terminated poly(dimethylsiloxane) with a theoretical number-average molar mass of 1000 g·mol−1 and bis(3-aminopropyl)-terminated poly(dimethylsiloxane) with a theoretical number-average molar mass of 2500 g·mol−1 were used for this purpose. The thermo-mechanical properties and gas separation characteristics for hydrogen, carbon dioxide and methane of these polymeric products were shown to be dependent on their composition.

scholarly journals Poly (Vinyl Alcohol) Composite Membrane with Polyamidoamine Dendrimers for Efficient Separation of CO2/H2 and CO2/N2

2021 ◽  
Author(s):  
yaxin zhao ◽  
Huafeng Tian ◽  
yuge ouyang ◽  
Aimin Xiang ◽  
Xiaogang Luo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Gas Separation ◽  
Composite Membrane ◽  
High Selectivity ◽  
Gas Adsorption ◽  
Separation Efficiency ◽  
Separation Process ◽  
Poly Vinyl Alcohol ◽  
Separation Performance ◽  
Efficient Separation

Abstract Although polyvinyl alcohol (PVA) membranes are commonly used for CO2 separation, there is still large development space in mechanical properties and high selectivity of the gas separation process. In this study, the gas separation performance and mechanical properties of the (PVA/Cu2+) substrate membranes were improved by introducing polyamidoamine (PAMAM). PAMAM had an important effect on the gas adsorption and separation performance of the membrane. In addition, the gas adsorption and separation properties of the PVA/Cu2+/PAMAM membrane (PPCm) were analyzed and studied when the inlet gas pressure and the species of mixed gases were variable. The results showed that the crystallinity and mechanical properties of the membrane with the PAMAM had been significantly improved. Young’s modulus of PPCm with 30% PAMAM was 132% higher than that of the PVA/Cu2+ composite membrane without PAMAM. In addition, efficient separation efficiency and high selectivity of the gas separation process were observed. The separation factors of the PPCm for CO2/H2 and CO2/N2 were about three times higher than that of the PVA/Cu2+ substrate membranes. These results suggested that the introduction of PAMAM was promising for CO2 separation and permeation.

Preparation, characterization and gas separation properties of nanocomposite materials based on novel silane functionalizing polyimide bearing pendent naphthyl units and ZnO nanoparticles

RSC Advances ◽  
2015 ◽  
Vol 5 (12) ◽  
pp. 8630-8639 ◽  
Author(s):  
Mohammad Dinari ◽  
Hashem Ahmadizadegan
Keyword(s):  
Mechanical Properties ◽  
Gas Separation ◽  
Zno Nanoparticles ◽  
Nanocomposite Materials ◽  
Thermal And Mechanical Properties ◽  
End Group

Nanocomposites of polyimide with silane end group and ZnO nanoparticles with good thermal and mechanical properties were prepared and were used for gas separation.

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