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Friday, June 1 • 3:30pm - 4:00pm
31. (Research and Technical Studies) Degradation makers of cellulose acetate during aging

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Being the first cellulose derivative that has been put into commercial production, CA (cellulose acetate) is a material that was used extensively in the 20th century by the film industry as well as by artists to create fine and decorative art. Compared with traditional material used in cultural heritage, cellulose acetate is a chemically unstable material resulting in shrinkage and deformation even at room temperature (such as “Little Large Glass” by Marcel Duchamp, Yale University Art Gallery). The material may has suffered from severely degradation when visible changes are found. It’s important to have proper evaluation of its preserve condition. Currently, scientists are concentrating on case studies instead of systemic research. In light of such situation, based on the review of plenty literature, several chemistry analysis methods are applied in this research, in order to find the degradation makers during degradation of cellulose acetate in different scales. Modern scientific methods such as SEM, FTIR, GPC and XRD are hired to explain degradation makers of cellulose acetate, providing support in the aspect of evaluation of degradation of cellulose acetate. The results showed deformation, curling and newly formed pores with the diameter in micrometer scale appears with the processing of degradation. The change of crystallinity differs from samples with different plasticizer content and artificial ageing in different conditions. The molecular weight experienced a significant decreasing during aging, while the molecular weight distribution didn’t see the same trend. Data from FTIR proves the characterization vibration bond changes. It should be highlighted the peak attributes to unbound water appears during ageing. Data from TGA-FTIR proves that the amount of thermal violate material decreases while degradation happens. The trend comes more significant with higher plasticizer content. Thermoporometery based on DSC analysis is an efficient method to characterize the pore structure in porous materials. Results from DSC and SEM shows that pore size of 7nm was found in all cellulose acetate samples, the diameter increase with the degradation. Cellulose acetate with 20% plasticizer content owns bigger pores compared with cellulose acetate ( 7.892 nm-9.347 nm). Interestingly, new pore with radius of 2.255nm appears in cellulose acetate with 20% plasticizer content. For the first time, a systemic research has been applied to investigate degradation makers, the results offer scientific support for cellulose acetate study as well as related micro-climate design.

Speakers
LL

Liu Liu

Postdoc Associate, Northwestern Polytechnical University
Being trained as a conservation scientist, Liu received her PhD of Conservation Science in 2017 from University of Science and Technology of China. She hold a bachelor degree of Material Chemistry and was a visiting assistant in research in Yale-Institute for the Preservation of Cultural... Read More →

Co-Authors
avatar for Lukasz Bratasz

Lukasz Bratasz

Head of Sustainable Heritage, Yale Institute for the Preservation of Cultural Heritage
Łukasz Bratasz received his PhD in 2002 from the Jagiellonian University in Krakow, Poland. In the same year, he joined the staff of the Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Krakow, where he remains a research fellow. He was a head... Read More →

Friday June 1, 2018 3:30pm - 4:00pm
Texas Ballroom (Foyer outside Ballrooms - Poster Session) Marriott Marquis Houston

Attendees (34)