Diffusion and swelling of carbon dioxide in amorphous poly(ether ether ketone)s

Wang, Dong; Jiang, Wei; Gao, Hong; Jiang, Zhenhua

doi:10.1016/j.memsci.2006.03.047

Cited by 15 publications

(3 citation statements)

References 24 publications

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“…13 Aer saturating the sample with CO 2 at a given pressure and temperature, the sample was quickly removed from the highpressure vessel and placed on the pan of an electronic digital balance (Mettler AS265S). The gravimetric method, which was reported previously by our group, was applied to study the amounts of CO 2 absorbed and desorbed.…”

Section: Characterizationmentioning

confidence: 99%

“…The gravimetric method, which was reported previously by our group, was applied to study the amounts of CO 2 absorbed and desorbed. 13 Aer saturating the sample with CO 2 at a given pressure and temperature, the sample was quickly removed from the highpressure vessel and placed on the pan of an electronic digital balance (Mettler AS265S). Using a computerized data acquisition system, the weights of the samples during desorption were recorded at short intervals aer venting the vessel.…”

Section: Characterizationmentioning

confidence: 99%

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Novel nanocellular poly(aryl ether ketone) foams fabricated by controlling the crosslinking degree

et al. 2015

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Films of poly(aryl ether ketone) containing naphthalene pendants on the side chains (NA-PAEK) with different crosslinking degrees were prepared by thermal crosslinking and foamed using a two-stage batch foaming process. The effects of the crosslinking degree on the sorption of CO 2 and foam morphology were investigated. The nucleation rate and foam morphology of the highly elastic polymer were found to depend on the stored elastic energy (SE). Therefore, SE could not be neglected in our system. In addition, the effects of processing parameters such as soaking pressure, soaking time, transferring time, foaming temperature, and foaming time on the foam morphology were investigated.By controlling the crosslinking degree and optimizing the processing parameters, nanocellular poly (aryl ether ketone) foam with a cell size of 86 nm (AE11 nm) was successfully fabricated.

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Section: Characterizationmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

Novel nanocellular poly(aryl ether ketone) foams fabricated by controlling the crosslinking degree

et al. 2015

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“…Since diffusion time is proportional to the square of diffusion length, the time for void air evacuation through moderate to thick laminates can be extremely long. 19–21 Therefore, in OVB processing of thick laminates, relying solely on diffusion mechanism to achieve low void content is not practical except in very thin laminates. A second mechanism utilizes the permeable interlayer regions formed by the rough surfaces of thermoplastic prepreg as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Void reduction of high-performance thermoplastic composites via oven vacuum bag processing

Zhang

Heider

Gillespie

2017

Journal of Composite Materials

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In this study, void reduction mechanisms during oven vacuum bag processing of high-performance carbon fiber thermoplastic composites are investigated. Entrapped air exists within the prepreg tape and between layers during lay-up and must be removed during processing to achieve aerospace quality (<1% void content) Key void reduction mechanisms during oven vacuum bag processing include through-thickness air diffusion and in-plane flow to the laminate edges through the permeable interlayer regions created by the prepreg surface roughness. Interlayer permeability between unidirectional and cross-ply laminates is measured experimentally and is sufficiently high for effective air removal during oven vacuum bag processing. Thick 72-layer carbon fiber/PEEK (poly (ether ether ketone)) laminates were fabricated with oven vacuum bag process under different edge sealing conditions. Void reduction in the laminate with sealed perimeter is dominated by air diffusion through the entire laminate thickness, and the laminate exhibits very high void content levels after oven vacuum bag processing. In the laminates with edges open to vacuum, air diffusion through a single layer and flow through the permeable interlayer lead to essentially void-free laminates. The findings show the importance of the interlayer permeability and edge conditions on the void reduction, and demonstrate that low void content can be achieved in thick section thermoplastic composite laminates via cost effective oven vacuum bag processing.

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Controlling cellular morphology by supercritical carbon dioxide

Wang

Jiang

Gao

et al. 2008

J of Applied Polymer Sci

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A series of high-performance porous materials, including open-cell and closed-cell foams, were prepared by a two-stage batch foaming process from fluorinated poly(arylene ether)s, and the porous morphology was characterized with scanning electron microscopy. The effects of saturation pressures, saturation temperatures, transfer times, molecular structures, and solvent traces on the cell sizes, cell densities, and bulk densities of porous materials were examined. According to the conclusions, the porous structures could be controlled with cellular sizes between the nanoscale and microscale. All nanoporous materials have dielectric constants in the ultralow-dielectric-constant range (1.4-2.0). The open structures can be prepared by two methods, and there are two kinds of morphologies from the two methods, including foams with small, spotlike openings (diameters between 10 and 100 nm) in the cell walls and bicontinuous nanoporous foams. Another special method for controlling the porous morphology was used here. Films with closedcell microcellular foams were placed in supercritical carbon dioxide again. The original morphology of the microcellular foam collapsed. The collapsed morphology was also characterized with scanning electron microscopy, and three kinds of cellular morphology were observed.

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Diffusion and swelling of carbon dioxide in amorphous poly(ether ether ketone)s

Cited by 15 publications

References 24 publications

Novel nanocellular poly(aryl ether ketone) foams fabricated by controlling the crosslinking degree

Novel nanocellular poly(aryl ether ketone) foams fabricated by controlling the crosslinking degree

Void reduction of high-performance thermoplastic composites via oven vacuum bag processing

Controlling cellular morphology by supercritical carbon dioxide

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