High-pressure hydrogen permeability model for crystalline polymers

Kanesugi, Hiroyuki; Ohyama, Keiko; Fujiwara, Hirotada; Nishimura, Shin

doi:10.1016/j.ijhydene.2022.09.205

Cited by 11 publications

(7 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the crystallinity is high, the molecular chains are tightly arranged, which leads to a decrease in the free volume fraction [ 50 ]. As for the gas permeation path, gas permeation in a polymer matrix can be described in terms of tortuosity [ 51 ], that is, the process by which gas penetrates the surface of the polymer material and passes around internal obstacles such as fillers, as shown in Figure 13 b. If tortuosity is applied to a crystalline polymer, the crystalline region in the polymer is the blocking part because the permeation of gas inside the polymer exhibits thermodynamic behavior and must follow the least energy path.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Cooling Rates on Thermal, Crystallization, Mechanical and Barrier Properties of Rotational Molding Polyamide 11 as the Liner Material for High-Capacity High-Pressure Vessels

Cheng

et al. 2023

Molecules

View full text Add to dashboard Cite

The rapid development of hydrogen fuel cells has been paralleled by increased demand for lightweight type IV hydrogen storage vessels with high hydrogen storage density, which raises the performance requirements of internal plastic liners. An appropriate manufacturing process is important to improve the quality of polymer liners. In this paper, DSC, WAXD, a universal testing machine and a differential pressure gas permeameter were used to investigate the effect of the cooling rate of the rotational molding polyamide 11 on the thermal, crystallization, mechanical and barrier properties. The cooling rate is formulated according to the cooling rate that can be achieved in actual production. The results suggest that two PA11 liner materials initially exhibited two-dimensional (circular) growth under non-isothermal crystallization conditions and shifted to one-dimensional space growth due to spherulite collision and crowding during the secondary crystallization stage. The slower the cooling process, the greater the crystallinity of the specimen. The increase in crystallinity significantly improved the barrier properties of the two PA11 liner materials, and the gas permeability coefficient was 2-3-fold higher than at low crystallinity. Moreover, the tensile strength, the tensile modulus, the flexural strength, and the flexural modulus increased, and the elongation at break decreased as the crystallinity increased.

show abstract

Section: Resultsmentioning

confidence: 99%

The Effect of Cooling Rates on Thermal, Crystallization, Mechanical and Barrier Properties of Rotational Molding Polyamide 11 as the Liner Material for High-Capacity High-Pressure Vessels

Cheng

et al. 2023

Molecules

View full text Add to dashboard Cite

show abstract

“…Moreover, permeability in polymers is related to the internal crystalline and amorphous phases. By assuming that PE exists in crystalline and amorphous phases, the volume fraction of the amorphous phase is known as an important factor affecting permeability [5,16,17]. The volume fraction of the amorphous phase (ϕ a ) can be calculated from the density of PE and the crystallinity measured by DSC in Table 1, as follows:…”

Section: Effects Of the Amorphous Phase And Free Volume On The Gas Pe...mentioning

confidence: 99%

“…where d PE [g/cm 3 ] is the density of PE and d o = 1.366 g/cm 3 and is the occupied density of PE obtained by the group contribution method [17,25,40]. The permeability is expressed as an exponential function of FFV, as follows:…”

Section: Effects Of the Amorphous Phase And Free Volume On The Gas Pe...mentioning

confidence: 99%

“…Recently, medium-density polyethylene (MDPE) and high-density polyethylene (HDPE) pipelines for the transport of pressurized methane-hydrogen mixture gas have gained interest as highly cost-effective candidate materials for lower permeation [15]. In addition, HDPE is used as a liner of Type IV fuel storage tanks in 70 MPa high-pressure hydrogen environments for lightweight fuel cell electric vehicles [16,17]. In a high-pressure hydrogen environment, rapid depressurization destroys the PEs and removes the sealing ability.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of the Gas Permeation Properties Using the Volumetric Analysis Technique for Polyethylene Materials Enriched with Pure Gases under High Pressure: H2, He, N2, O2 and Ar

Lee,

Kim,

Jung

2023

Polymers

View full text Add to dashboard Cite

Polyethylene (PE) is widely used as a gas-sealing material in packing films and gas transport pipes. A technique for evaluating the permeability of water-insoluble gases has recently been developed. This technique is a volumetric analysis that is used to calculate the gas permeability by measuring the gas uptake and diffusivity. With this technique, we investigated the permeability of pure gases, such as H2, He, N2, O2 and Ar, enriched under high pressure up to 9 MPa in low-density polyethylene (LDPE), ultrahigh molecular weight polyethylene (UHMWPE) and high-density polyethylene (HDPE). The gas uptake showed a linear pressure-dependent behavior that followed Henry’s law, and the diffusivity was independent of the pressure. Furthermore, the logarithmic diffusivity values of the five gases linearly decreased as their molecular kinetic diameters increased. The logarithmic solubility values linearly increased as the critical temperatures of the gases increased. The calculated permeability results were correlated with the volume fraction of the amorphous phase and the fractional free volume. This result newly showed that the amorphous phase was directly correlated to the fractional free volume.

show abstract

“…Hydrogen (H 2 ) is a clean energy carrier alternative to fossil fuels. , However, H 2 is highly flammable and may cause fires and explosions if not handled properly . Due to these limitations, the on-site H 2 production technology has increasingly gained attention .…”

Section: Introductionmentioning

confidence: 99%

Membrane Reactor Supported by MXene (Ti₃C₂T_X) for Hydrogen Production by Ammonia Decomposition

Jin

Fan

et al. 2023

Energy Fuels

View full text Add to dashboard Cite

Hydrogen (H 2 ) production by ammonia (NH 3 ) decomposition offers a solution to the energy problem. In this work, an MXene (titanium carbide, Ti 3 C 2 T X ) membrane was successfully synthesized by depositing it onto the anodic aluminum oxide (AAO) substrate using vacuum-assisted filtration. Then, a membrane reactor supported by MXene was developed for H 2 production by NH 3 decomposition. The MXene membrane reactor could achieve an H 2 permeance of 2.85 × 10 −7 mol m −2 s −1 Pa −1 and an H 2 / N 2 selectivity of 20 at 773.15 K. Next, a Ni-La/γ-Al 2 O 3 catalyst prepared by impregnation and sintering was added to catalyze the NH 3 decomposition process. The experimental results showed that the reactor could achieve a 99% NH 3 conversion at 773.15 K, i.e., 9% higher than that of the packed catalytic reactor (without membrane). A mathematical model of the membrane reactor was developed to explain the experimental results. The calculated activation energies (E ad ) of the MXene membrane for H 2 and N 2 permeances were 64.95 and 69.53 kJ mol −1 , respectively. The activation energy (E ar ) of NH 3 decomposition was 147.8 kJ mol −1 . Both the experimental and modeling results showed that the membrane reactor could enhance NH 3 conversion and promote the production of high-purity H 2 .

show abstract

High-pressure hydrogen permeability model for crystalline polymers

Cited by 11 publications

References 37 publications

The Effect of Cooling Rates on Thermal, Crystallization, Mechanical and Barrier Properties of Rotational Molding Polyamide 11 as the Liner Material for High-Capacity High-Pressure Vessels

The Effect of Cooling Rates on Thermal, Crystallization, Mechanical and Barrier Properties of Rotational Molding Polyamide 11 as the Liner Material for High-Capacity High-Pressure Vessels

Investigation of the Gas Permeation Properties Using the Volumetric Analysis Technique for Polyethylene Materials Enriched with Pure Gases under High Pressure: H2, He, N2, O2 and Ar

Membrane Reactor Supported by MXene (Ti₃C₂T_X) for Hydrogen Production by Ammonia Decomposition

Contact Info

Product

Resources

About

High-pressure hydrogen permeability model for crystalline polymers

Cited by 11 publications

References 37 publications

The Effect of Cooling Rates on Thermal, Crystallization, Mechanical and Barrier Properties of Rotational Molding Polyamide 11 as the Liner Material for High-Capacity High-Pressure Vessels

The Effect of Cooling Rates on Thermal, Crystallization, Mechanical and Barrier Properties of Rotational Molding Polyamide 11 as the Liner Material for High-Capacity High-Pressure Vessels

Investigation of the Gas Permeation Properties Using the Volumetric Analysis Technique for Polyethylene Materials Enriched with Pure Gases under High Pressure: H2, He, N2, O2 and Ar

Membrane Reactor Supported by MXene (Ti3C2TX) for Hydrogen Production by Ammonia Decomposition

Contact Info

Product

Resources

About

Membrane Reactor Supported by MXene (Ti₃C₂T_X) for Hydrogen Production by Ammonia Decomposition