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Title: Quantitative magnetic resonance imaging study of water uptake by polyamide 4,6
Authors: ADRIAENSENS, Peter
Litvinov, VM
Tijssen, J
Issue Date: 2001
Citation: POLYMER, 42(19). p. 7943-7952
Abstract: Magnetic resonance imaging (MRI) and NMR relaxation experiments are used to study the water absorption by polyamide 4,6 (PA46) plates. Despite the higher crystallinity, PA46 absorbs more water as compared to the polyamides 6 and 6,6 (PA6 and PA66). Relaxation measurements demonstrate that the volume averaged molecular mobility (T-2(H)) Of the absorbed water molecules in PA46 is higher than in PA6 and PA66. Quantitative relaxation results of water saturated PA46 further suggest fast exchange between free water and water molecules bound via hydrogen bonds to amide groups. MRI reveals a gradual decrease in the amount and the T-2(H) relaxation behaviour of water from the surface towards the core part of PA46 plates. This can be explained by the very high crystallisation rate of PA46, which prevents the close coupling of amide groups in the amorphous phase and results in a larger mean distance between the amide groups, especially in the outer part of the PA46 plates. Density measurements (WAXS and gradient column) show an increase of the density of the amorphous phase during annealing, resulting in a lower water uptake and a lower mobility of the absorbed water molecules. (C) 2001 Elsevier Science Ltd. All rights reserved.
Notes: Limburgs Univ Ctr, IMO, Mat Res Inst, Dept SBG, B-3590 Diepenbeek, Belgium. DSM Res BV, NL-6160 MD Geleen, Netherlands.Gelan, J, Limburgs Univ Ctr, IMO, Mat Res Inst, Dept SBG, Univ Campus,Bldg D, B-3590 Diepenbeek, Belgium.
URI: http://hdl.handle.net/1942/2752
DOI: 10.1016/S0032-3861(01)00314-7
ISI #: 000169391000003
ISSN: 0032-3861
Category: A1
Type: Journal Contribution
Validation: ecoom, 2002
Appears in Collections: Research publications

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