DOI: https://doi.org/10.21203/rs.3.rs-30014/v1
The microbubble disease of cellulose acetate microfilm is accompanied by the production of acetic acid syndrome, which has a negative influence on the integrity of image information. In the present study, cellulose acetate microfilm produced microbubble disease from the Republic of China (AD 1912-1949) collected in the Second Historical Archives of China is chosen as a prototype to study its treatment methods.A combination of optical microscopic and needle is carried out to remove plasticizer in microbubble for the first time. The plasticizer can be effectively removed by infiltrating n-butanol into the microbubble from a small hole broken by the needle. Owing to the unclear image information after plasticizer removed, the SEM and laser confocal microscopeare used to study the morphology and roughness of the inner surface of microbubble. It can be found that the unclear image informationis attributed to the light scattering from rough interface. Based on the advantages of ethyl cellulose in file protection, the optimal concentration of ethyl cellulose is selected and used to fill the interior of the microbubble to obtain clearer image information. To determine the protective potential of thisfilling materials,the chemical and mechanical properties of coated film after dry heat, hygrothermal andUVaccelerated aging are measured.Based on theabove-mentioned results, it is encouraging that a new microrepair method and its corresponding method are offered in film treatment work.
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