Non-destructive, three-dimensional monitoring of water absorption in polyurethane foams using magnetic resonance imaging

Braun, J.; Klein, Matthew; Bernarding, Johannes; Leitner, Michael; Mika, H.-D.

doi:10.1016/s0142-9418(03)00009-6

Cited by 13 publications

(10 citation statements)

References 17 publications

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“…This is very spectacular in the polyurethane matrix but doesn't seem to occur in the polypropylene matrix. The polymer fluid absorption is known [13,15,21]. It is also shown in [21], that swelling can be observed with water rather than ethanol.…”

Section: Discussionmentioning

confidence: 99%

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In situ observation of syntactic foams under hydrostatic pressure using X-ray tomography

et al. 2013

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Syntactic foams (hollow glass microspheres embedded in a polymeric matrix) are being used increasingly for the purpose of thermal insulation in ultradeep water. A better understanding of the damage mechanisms of these materials at the microsphere scale under such a hydrostatic loading condition is of prior importance in determining actual material limits, improving phenomenological modelling and developing novel formulations in the future. To achieve this goal, a study based on X-ray microtomography was performed on two syntactic foam materials (polypropylene and polyurethane matrix) and a standard foamed PP. A special set up has been designed in order to allow the X-ray microtomographic observation of the material during hydrostatic pressure loading using ethanol as the pressure fluid. Spatial resolution of (3.5 μm) 3 and in situ non-destructive scanning allowed a unique qualitative and quantitative analysis of the composite microstructure during stepwise isotropic compression by hydrostatic pressure up to 50 MPa. The collapse of weaker microspheres were observed during pressure increase and the damage parameters could be estimated. It is shown that the microspheres which are broken or the porosities which are close to the surface in the foamed PP are filled by a fluid (either the ethanol or the polymeric matrix itself). The hydrostatic pressure decreases the volume of the foam only slightly. In the PU matrix, ethanol diffusion is seen to induce swelling of the matrix, which is an unexpected phenomenon but reveals the high potential of X-ray microtomographic observation to improve diffusion analysis in complex media.

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Section: Discussionmentioning

confidence: 99%

“…The polymer fluid absorption is known [13,15,21]. It is also shown in [21], that swelling can be observed with water rather than ethanol. In his article on hydrostatic compression of PP foams [15] Philippe Viot solved the water absorption problem by coating the samples with a silicone gel which protects from water penetration.…”

Section: Discussionmentioning

confidence: 99%

In situ observation of syntactic foams under hydrostatic pressure using X-ray tomography

et al. 2013

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“…The line-narrowing multipulse sequences based on magic echo [9] are especially convenient for imaging application [10]. Among systems with broad spectra, studied with MRI, are polymers [11][12][13][14][15][16][17], porous materials [18,19], other hetero-phase systems [20], biomedical polymers [21][22][23][24][25] and semisolid materials [26]. A review of imaging techniques for solid materials can be found in Ref.…”

Section: Introductionmentioning

confidence: 99%

Magnetic resonance imaging of objects with dipolar-broadened spectra using soft excitation pulses

Kim¹,

Khitrin²

2005

Magnetic Resonance Imaging

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“…Com essa análise é possível ter um bom indicativo de porosidade entre as espumas. Thomson (2005) (BRAUN et al, 2003;THOMSON, 2005;TANOBE,2007). Portanto, as espumas com diâmetros médio de poros maiores apresentam uma menor resistência ao fluxo e um comportamento de sorção mais linear.…”

Section: Permeabilização Ao Arunclassified

“…Com os resultados apresentados neste ensaio foi possível observar que a espuma comercial apresentou um caráter mais hidrofílico entre as espumas testadas. Porém este comportamento de sorção de água apresentado pelas espumas são influenciados não apenas pela natureza do poliol e pelos parâmetros morfológicos das espumas, mas também pelas propriedades dos solventes utilizados, uma vez que a tensão superficial, a viscosidade e a polaridade do líquido influenciam nesta penetração (BRAUN et al, 2003;THOMSON, 2005;TANOBE,2007).…”

Section: Permeabilização Ao Arunclassified

Síntese e caracterização de espumas de poliuterano para imobilização de células íntegras e aplicação na síntese de biodiesel

Soares¹

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Non-destructive, three-dimensional monitoring of water absorption in polyurethane foams using magnetic resonance imaging

Cited by 13 publications

References 17 publications

In situ observation of syntactic foams under hydrostatic pressure using X-ray tomography

In situ observation of syntactic foams under hydrostatic pressure using X-ray tomography

Magnetic resonance imaging of objects with dipolar-broadened spectra using soft excitation pulses

Síntese e caracterização de espumas de poliuterano para imobilização de células íntegras e aplicação na síntese de biodiesel

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