Sorption and transport behavior of water vapor in dense and asymmetric polyimide membranes

Huang, Jieyang

doi:10.1016/j.memsci.2004.04.035

Cited by 23 publications

(4 citation statements)

References 25 publications

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“…result of many other workers [16,17,40,41]. As discussed in this body of prior work, the observed increasing trend in permeability may relate to both plasticization of the polymer matrix by water vapor [17,42,43] and to the increasing water vapor solubility [16,17,40,44], as shown in Fig. 3.…”

Section: Validation Of Permeability Valuesmentioning

confidence: 69%

Water vapor permeation in polyimide membranes

Chen

Scholes

Qiao

et al. 2011

Journal of Membrane Science

147

102

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Section: Validation Of Permeability Valuesmentioning

confidence: 69%

Water vapor permeation in polyimide membranes

Chen

Scholes

Qiao

et al. 2011

Journal of Membrane Science

147

102

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“…The transport mechanism of the moisture in the membrane is related to the membrane properties and microscopic structures. For dense membranes, the moisture transport is commonly explained by solution-diffusion theory [29][30][31][32]. According to this theory, the water vapor first dissolves in the membrane and then diffuses through the membrane under concentration (i.e.…”

Section: Commonly Applied Methodsmentioning

confidence: 99%

Numerical and experimental study of a novel three-fluid membrane dehumidification method applied to spacecraft humidity control

Yang

Yuan

Shang

et al. 2017

Journal of Membrane Science

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Condensing dehumidification method is widely applied to humidity control in manned spacecraft cabin. Under the micro-gravity condition, the condensate water has to be removed actively by additional water/air separation and water recycling processes. This paper presents a novel three-fluid membrane dehumidification method for spacecraft humidity control, which is expected to replace the condensing method. The cold water provides a low water vapor partial pressure to drive the moisture transfer across the membrane from the humid air, while the hot water maintains the humid air temperature above the dew point to prevent the possible dewing. The diffusivity of water vapor in membrane is first determined by an experiment with the help of the particle swarm optimization (PSO) algorithm. With the experimentally determined diffusivity, the three-fluid membrane dehumidification is studied experimentally and theoretically, and the mathematical model reaches a good agreement with the experimental results. The novel dehumidification method is experimentally validated to be feasible; that is to say the dehumidification can be realized and meanwhile there is no dewing on the outer surface of the membrane. The heat and mass transfer performance is also studied under various operating conditions. The three-fluid membrane dehumidification shows superior thermodynamic performance compared with the condensing method.

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“…Porous polyimide membranes (PPMs) are usually produced by the non-solvent induced phase inversion (NIPI) method in a wet process [1][2][3]. A polymer-rich phase and a polymer-lean phase in the homogeneous dope polymer solution are formed in a coagulating liquid because of the diffusive exchange of solvent and non-solvent.…”

Section: Introductionmentioning

confidence: 99%

A new route of fabricating porous polyimide membranes

Xiao

Shang

Qin

2010

Int J Miner Metall Mater

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A novel experimental route to fabricate porous polyimide membranes (PPMs) with ideal air permeability was reported. The polymer solution layer consisting of the corresponding polyamic acid (PAA), solvent, and dibutyl phthalate (DBP) with a boiling temperature of 340ºC was treated by a simple process. The polymer solution layer was first treated at a lower temperature (about 150ºC), then the received solid membrane was further imidized at a higher temperature (about 270ºC), and finally, DBP was removed from the membrane at a temperature above its boiling temperature. The final asymmetric polyimide membrane with a dense skin layer was obtained. To improve the air permeability of the polyimide membranes, the polymer solution layer was treated between two substrates. And the PPMs with open pores on both sides are fabricated and the air permeability of the films is improved greatly.

show abstract

Sorption and transport behavior of water vapor in dense and asymmetric polyimide membranes

Cited by 23 publications

References 25 publications

Water vapor permeation in polyimide membranes

Water vapor permeation in polyimide membranes

Numerical and experimental study of a novel three-fluid membrane dehumidification method applied to spacecraft humidity control

A new route of fabricating porous polyimide membranes

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