TY - JOUR
T1 - Comparison of NMR and confocal Raman microscopy as coatings research tools
AU - Erich, S.J.F.
AU - Laven, J.
AU - Pel, L.
AU - Huinink, H.P.
AU - Kopinga, K.
PY - 2005
Y1 - 2005
N2 - Recently, several new experimental techniques have been developed to measure the spatial and temporal evolution of a drying coating film. One of these techniques is nuclear magnetic resonance (NMR) using a very high magnetic field gradient. An advantage of this technique is the ability to image a nontransparent coating film perpendicular to its surface with a resolution better than 10 m (depth profiling). Another, well known technique is confocal Raman microscopy (CRM). This paper deals with a comparative study of such a microimaging NMR setup and confocal Raman microscopy for two alkyd coatings, one organic solvent based and another water based. The NMR and CRM results show a good similarity, when comparing NMR profiles with the disappearance of the double bonds (CRM-detectable) of the unsaturated fatty acids. This indicates that the disappearance of the double bonds in the fatty acid side chains of the alkyd molecules is directly connected with the formation of cross links by these fatty acid entities. This oxidative cross linking results in an increase of viscosity and therefore in a change of the measured NMR relaxation times.
AB - Recently, several new experimental techniques have been developed to measure the spatial and temporal evolution of a drying coating film. One of these techniques is nuclear magnetic resonance (NMR) using a very high magnetic field gradient. An advantage of this technique is the ability to image a nontransparent coating film perpendicular to its surface with a resolution better than 10 m (depth profiling). Another, well known technique is confocal Raman microscopy (CRM). This paper deals with a comparative study of such a microimaging NMR setup and confocal Raman microscopy for two alkyd coatings, one organic solvent based and another water based. The NMR and CRM results show a good similarity, when comparing NMR profiles with the disappearance of the double bonds (CRM-detectable) of the unsaturated fatty acids. This indicates that the disappearance of the double bonds in the fatty acid side chains of the alkyd molecules is directly connected with the formation of cross links by these fatty acid entities. This oxidative cross linking results in an increase of viscosity and therefore in a change of the measured NMR relaxation times.
U2 - 10.1016/j.porgcoat.2004.12.002
DO - 10.1016/j.porgcoat.2004.12.002
M3 - Article
SN - 0300-9440
VL - 52
SP - 210
EP - 216
JO - Progress in Organic Coatings
JF - Progress in Organic Coatings
IS - 3
ER -