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The history, structure and manufacture of rubberised textiles, and the perception of rubber as a 'modern' material, are discussed, along with its main conservation problems. Two specific case histories are presented as examples of the variability of the condition problems associated with rubber, and possible treatment solutions. An 1890s rubberised wool raincoa t was received largely in good condition, and required rapid development of an oxygen-free storage system to stabilise it before any interventive support treatment could be implemented. The system was assessed and redesigned five years on. In contrast, a 1968 rubberised viscose flight bag is discussed; this was already severely degraded and required mainly interventive treatment to reshape and support.
The history, structure and manufacture of rubberised textiles, and the perception of rubber as a 'modern' material, are discussed, along with its main conservation problems. Two specific case histories are presented as examples of the variability of the condition problems associated with rubber, and possible treatment solutions. An 1890s rubberised wool raincoa t was received largely in good condition, and required rapid development of an oxygen-free storage system to stabilise it before any interventive support treatment could be implemented. The system was assessed and redesigned five years on. In contrast, a 1968 rubberised viscose flight bag is discussed; this was already severely degraded and required mainly interventive treatment to reshape and support.
This study evaluates a commercial polycyanoacrylate adhesive of medium viscosity regarding its suitability for the restoration of glass objects of cultural heritage in a museum environment (exhibition/storage). Loctite® Super Attak was investigated in terms of (a) its polymerisation rate and degree of conversion, using Infrared Spectroscopy FT-IR by monitoring the change of the C=C peak vs.C=O peak and (b) the alteration of the colour parameters of its films after its submission to UVC irradiation for several time intervals. It was confirmed that within 6 h, a thin-layered adhesive film acquires 80–85% of its polymerization in ambient conditions, while the reaction continues for up to 12–18 h in the conditions examined. The progress of the reaction is slower when the adhesive is in a protected environment. On the other hand, the effect of UVC rays on the glue is destructive and oxidative, provoking a yellow shade/colour from the first hours of exposure. The intensity of the yellowness becomes higher after 6 h of exposure, showing shifts in the absorption peaks of C–O/C=O groups of the initial IR spectrum and the augmentation of –OH absorptions. It was concluded that the adhesive is suitable for glass restoration, especially for instant, rapid, applications, under mild conditions of maintenance and exposure.
Identifying the most vulnerable plastics and monitoring their deterioration is one of the main problems within heritage collections with historical synthetic polymers. Gathering and interpreting data about material and degradation phenomena in a collection reveals its conservation needs. A systematic survey of the collection can help towards this purpose. Surveys aiming at inspecting and documenting damages rely on several tools in order to fulfill their purpose. Firstly, objective descriptions of the damages that may appear, and secondly, the means of acquiring and interpreting material information. To address these needs, this article presents (a) a visual damage catalogue of degradation phenomena in plastic and rubber materials, and (b) the implementation of Fourier-transform infrared spectroscopy (FTIR) and pyrolysis–gas chromatography–mass spectrometry (py-GCMS) for the identification of analytically challenging rubber materials and of blooming phenomena. The damage catalogue is based solely on visual and olfactory signs, so that the assessment is independent of possible causes of damages and underlying processes, with the purpose of allowing objectivity to prime over interpretation. The limitations of the use of FTIR in the identification of heavily compounded rubbers in museum surveys is highlighted, and examples are presented. The use of py-GCMS on these cases conveniently allowed the identification of the constituting monomers of several rubber materials where FTIR could not provide a univocal classification of the material present. The study of several cases of blooming allowed the identification of diverse compositions and origins, showing that the description of a degradation phenomenon is only the first step towards its understanding. Unveiling the nature of a particular case of blooming is particularly critical when conservation treatments, such as the removal of a (potentially protecting) layer, are planned. For this purpose, attenuated total reflection-FTIR (ATR-FTIR) as a surface technique was particularly useful.
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