Electronic Resource
Bognor Regis [u.a.]
:
Wiley-Blackwell
Journal of Polymer Science Part A: Polymer Chemistry
27 (1989), S. 3429-3438
ISSN:
0887-624X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
1H magnetic resonance imaging (MRI) is used to study the distribution of water in polyurethane foams. Flexible open-celled foams are easily distinguished from the closed-cell foams as the latter does not absorb any detectable amounts of water. Flexible foams degassed in vacuo revealed no structural detail due to the resolution limitation of approximately 100 μm. Incompletely degassed foams revealed considerable areas of trapped gas which were recorded as a function of distance beneath the water. Samples injected with water indicated that a tortuous flow pathway is taken due to the presence of cell windows. Samples with lower porosity had a higher resistance to flow.
Additional Material:
10 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pola.1989.080271021
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