Studies on the Deterioration of the Cordon of the Most Illustrious Order of Chulachomklao

Abstract:

The Cordon of the Most Illustrious Order of Chulachomklao was one of the insignia that King Rama the fifth gave to the ladies of the court to present their goodness. One component of this object was made from silk and decorated by needled the silvered and golden thread as the laurel and the initial of King’s royal name. This ancient silk suffers from discoloration, low strength and severe deterioration. Amino acids in fibroin were photo-degraded under UV-irradiation and heat. Three silk samples, S-Raw, S-White and S-Ancient, were selected for ATR-FTIR and XRD analyses. FTIR spectroscopy can be used for the determination of the molecular structure of silk fibroin. The characteristic bands of silk fibroin corresponding to amide I, II, and III were found in all silk samples. The skeletal vibrations were also observed. Two degradation estimators, E_AmideI/II and Ec_C=O2 were calculated and used to qualitatively estimate the degree of degradation due to oxidation and crystallinity of silk fibroin respectively. The results showed the higher degree of degradation and lower crystallinity of A-Ancient. The X-ray diffraction of S-Ancient showed the broader and weaker characteristic peaks at 2 theta of ∼ 20o indicating the lower crystallinity.

• Periodical: Key Engineering Materials (Volume 757)
• Pages: 24-28
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.757.24
• Online since: October 2017
• Authors: Kanidtha Chuapanit*, Radchada Buntem
• Keywords: Art Conservation Science, ART-FTIR, Silk Deterioration, Thai Ancient Silk, XRD

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