09 February 2010

Analytical chemical studies on traditional linseed oil paints (2002)

Title: Analytical chemical studies on traditional linseed oil paints
Author: Jorrit Dirk Jan van den Berg
University: University of Amsterdam
Year: 2002
Type of document: PhD thesis
Download: http://www.amolf.nl/... (pdf)

From the Summary:
This thesis contributes to the determination and understanding of the internal chemistry of oil paint systems at the different stages in their lifetime. [...] The main idea put forward and explored further in this thesis is the transition from a cross-linked network of triacylglycerols to a metal bound ionomeric network resulting from hydrolysis of the glycerol ester bonds and the interaction with pigments. The work described in this thesis focuses on analytical chemical investigations of oil paint systems and the information that can be obtained from these studies in relation to a model of an ageing oil paint.

Table of Contents (short version):

1. General Introduction
1.1 Paints and painting
1.2 Drying oil paints
1.3 Degradation of linseed oil paint
1.4 Analytical chemical research on linseed oil paints
1.5 Scope of the thesis

2. Oil paint: developmental stages from an oil to a hard dry film
2.1 Production of linseed oil
2.2 The composition of linseed oil
2.3 Refining and heat processing of linseed oil
2.4 Autoxidation
2.5 Photoxidation
2.6 Condensation reactions
2.7 Formation of low molecular material
2.8 Heat-induced chemical changes in drying oils
2.9 Oil paint
2.10 Summary and relevance for paintings

3. The effect of traditional processing methods of linseed oil on the composition of its triacylglycerols
3.1 Introduction
3.1.1 Analytical techniques
3.1.2 Experimental design
3.2 Materials and methods
3.3 Results
3.4 Discussion
3.5 Conclusion

4. Direct temperature resolved mass spectrometry of oil paint constituents and aged oil paints
4.1 Introduction
4.2 Experimental
4.3 Results
4.4 Discussion
4.5 Conclusion

5a. Identification of non-cross-linked compounds in methanolic extracts of cured and aged linseed oil based paint films using GC/MS
5.1 Introduction
5.2 Experimental
5.3 Results/Discussion
5.4 Conclusion

5b. Unwanted alkylation during direct methylation of fatty (di)acids using tetramethyl ammonium hydroxide reagent in a Curie-point pyrolysis unit
5.5 Introduction
5.6 Experimental
5.7 Results and discussion
5.8 Conclusion

6. Determination of the degree of hydrolysis of oil paint samples using a two-step derivatisation method and on-column GC/MS
6.1 Introduction
6.2 Experimental
6.3 Results and discussion
6.4 Conclusions

7. Studies on the composition and formation of bloom on primed canvas used by F. E. Church and on paints in works of art by F. Stella
7.1 Introduction
7.2 Materials and methods
7.3 Results Case I
7.4. Results Case II: Bloom on paintings by Frank Stella


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