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Master's Dissertation
DOI
https://doi.org/10.11606/D.46.2008.tde-10062008-150929
Document
Author
Full name
Marcia de Mathias Rizzo
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2008
Supervisor
Committee
Matos, Jivaldo do Rosario (President)
Baptista, Maurício da Silva
Machado, Luci Diva Brocardo
Title in Portuguese
Caracterização físico-química em materiais de esculturas de cera do Museu Alpino
Keywords in Portuguese
Bens culturais
Caracterização físico-química
Degradação biológica
Infravermelho
Materiais de esculturas
Materiais orgânicos e inorgânicos
Microscopia eletrônica
Química de superfície
Abstract in Portuguese
As esculturas de cera do Museu Alpino, no Brasil, compostas por diversos materiais orgânicos e inorgânicos, apresentaram um tipo de degradação da superfície a qual foi investigada cientificamente através de metodologia diversificada baseada no uso de técnicas complementares, com cruzamento dos resultados. As matérias primas assim como os produtos de degradação foram caracterizadas físico-química e analiticamente. Foram empregadas as técnicas: análise térmica (termogravimetria, termogravimetria derivada e calorimetria exploratória diferencial); espectroscopia no infravermelho; análise elementar e microscopia eletrônica de varredura com analisador de dispersão de energia de raios X. A MEV/EDS foi utilizada para inspeção da micro morfologia da superfície e através dela foi possível identificar a presença de microorganismos que estavam causando a degradação físico-química pela forma como se fixaram na superfície através de suas hifas e por utilizarem os ácidos graxos presentes na cera como substrato metabólico. Os resultados de FTIR constataram a diminuição de ácidos graxos na superfície deteriorada em relação à superfície em bom estado. A TG/DTG e DSC permitiram avaliar o comportamento térmico das matérias primas e das amostras retiradas das obras de arte. Foi constatada a teoria da obra de arte como parte do ecossistema e a importância da utilização de políticas de preservação dos bens culturais por meio de ambientes controlados.
Title in English
Physical-chemical characterization of waxy sculptures materials from the Museum Alpino
Keywords in English
Biological degradation
Cultural property
Organics and inorganics materials
Physical-chemical characterization
Abstract in English
The waxy sculptures from Museum Alpino in Brazil, made of different organics and inorganics materials, presented a kind of surface degradation, which was scientifically investigated by multi-step methodology based on the use of complementary techniques with the interconnection of results. The raw materials as well as the degradation products were characterized physical-chemical and analytically. It was applied the following techniques: thermal analysis (thermogravimery, derivated thermogravimetry and differential scanning calorimetry); infrared spectroscopy; elemental analysis and scanning electronic microscopy with X ray energy dispersion system. The scanning electronic microscopy was used for the inspection of the micro morphology of the surface and after that it was possible to identify the presence of microorganisms which were causing the physical-chemical degradation analyzing the way they fixed their hyphae on the surface and the use of fat acids as metabolic substrate. Observing the FTIR results it was possible to notice the reduction of the fat acids on the deteriorated surface compared to the good surface. TG/DTG e DSC allowed to known the thermal behavior of the raw materials and the art works samples. It was possible to realize the theory of the work of art as part of the ecosystem and the importance of the cultural property's preservation policy by controlled ambient.
 
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ErrataMarciaMRizzo.pdf (33.53 Kbytes)
Publishing Date
2008-07-16
 
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