| Summary: | 碩士 === 國立臺南藝術大學 === 博物館學與古物維護研究所 === 103 === In recent years, machine-mounting, with ready- made mounting parts, is used to replace the manual operation. It increases the efficiency of mount-making compared with traditional hand-made technique. However, the degradation characteristics of ethylene vinyl acetate (EVA) adhesive used by machine-mounting have not been tested; the use of modern materials in machine-mounting still requires further investigation. The purposes of this study is to analyze the suitability of EVA adhesive used in first lining step of machine-mounting, to investigate to EVA adhesive influence on the paper substrate of painting, and to evaluate the possibility of application for conservation purposes.
According to previous studies, EVA is classified as a hot melt adhesive, and hydrolysis is one of its major degradation mechanisms, which produces acetic acid with yellowing visual effect. This research simulates machine-mounting by accelerating hydrothermal aging artificially to study the changes of the paper properties optically, mechanically and chemically by using scanning electronic microscope (SEM), colorimetry, whiteness meter, folding endurance, pH measurement, etc. to understand the possible damages of degradation.
Experimental results show that the degraded EVA film will penetrate into the paper fibers, change the paper color, lower opacity, and enhance folding endurance, and slightly reduce the pH of the paper. This research suggests a well-controlled environment of conserving those machine-mounting objects, not only because the hydrolysis will be more active with high temperature and humidity, but also the EVA film will melt in high temperature. Due to its irreversible nature of EVA adhesive after aging, machine-mounting technique is so far not applicable to conservation application.
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