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An Evaluation of selected applied polymers for the treatment of parchment

Gomaa Abdel-Maksoud
Cairo University, Faculty of Archaeology, Conservation Department
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Abstract

Introduction

Materials and methods

Results and discussion

Conclusions

  1. For the lightness color (L value), it can be said that the treated and aged treated samples with Paraloid B.67, Plexisol P.550 and Polyvinyl alcohol were good colors at all concentrations and were approximately near from aged sample after 2 weeks, but the first and the second concentrations were better than the third concentration, which was little dark especially after aging with Paraloid B.67. The treated and aged treated samples with Primal AC.33, Primal E.330 and Klucel G gave poor lightness at all concentrations, since all the results obtained tend to dark color without Primal E.330 after the treatment (it gave a good result).
  2. For the red color (a value), the best results were obtained from the treated samples with Klucel G at the second and the third concentrations and Primal E.330 at the first concentration after both the treatment and aging. The results obtained from the treatment and aged treated samples with Plexisol P.550, Paraloid B.67 and Polyvinyl alcohol were quite good after both the treatment and aging. The poor result were obtained from Klucel G at the first concentration, Primal E.330 at the second and the third concentration and Primal AC.33 at all concentrations.
  3. For the yellow color (b value), the treated and aged treated samples with Paraloid B.67, Plexisol P.550 and Polyvinyl alcohol were good and more better than Klucel G, Primal AC.33 and Primal E.330.
  4. For the total color (E value), it can be said that the changes in total color with treated and aged treated samples with Plexisol P.550, Paraloid B.67 and Polyvinyl alcohol were little better than with Klucel G, Primal E.330 and Primal AC.33.
  5. The results confirmed that the treated samples with paraloid B.67, Plexisol P.550 and polyvinyl alcohol were good after both the treatment and aging. Since they have given high reduction in the humidity sorption especially at the second and third concentrations. This gave indication that these polymers tolerated the heat aging. The reduction of the humidity sorption of treated and aged treated samples with Primal AC.33, Primal E.330 and Klucel G gave poor reduction (without Primal AC.33 at the first concentration) compared with the last three polymers.
  6. All the polymers studied gave an increasing in the tensile strength and elongation in both perpendicular and parallel directions (compared with aged samples after 2 weeks).

References

  1. Abdel-Maksoud, G. M. M., Marcinkowska, E., Evaluation of vegetable tanned-leather after artificial ageing as compared to archaeological samples, In: ICOM Committee for Conservation, 12th triennial meeting, Lyon 29 August - 3 September, 1999, p. 913.
  2. Abdel-Maksoud, G. M. M., Preparation of parchment samples for experimental studies in conservation. Journal of Cracow University of Technology, 1A, 1999, pp.154-167.
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  6. Leather - Determination of tensile strength and elongation, ISO 3376, International Standards Organisation 1976
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  8. Paper - Standard atmospheres for conditioning and/or testing - specifications. ISO 554. International Standards Organisation 1976
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