The thermal aging of Parylene and the effect of antioxidant

The thermal oxidation of Parylene N and Parylene C has been studied in connection with the use of these polymers in conservation. The results of previous investigations have been compared, confirmed and expanded. On the basis of measurements of degradation at temperatures between 125°C and 200°C, th...

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Bibliographic Details
Published in:Studies in conservation 1991-02, Vol.36 (1), p.44-52
Main Authors: Grattan, D. W., Bilz, M.
Format: Article
Language:English
Subjects:
Ageing
Antioxidants
Applied sciences
Art and archaeology
Conservation. Restauration
Dimers
Exact sciences and technology
Generalities
Material films
Mathematical extrapolation
Methods
Methods of observation
Monomers
Oxidation
Oxygen
Physical properties
Polymer chemistry
Polymer industry, paints, wood
Polymers
Properties and testing
Research principies
Service life
Technology of polymers
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Summary:The thermal oxidation of Parylene N and Parylene C has been studied in connection with the use of these polymers in conservation. The results of previous investigations have been compared, confirmed and expanded. On the basis of measurements of degradation at temperatures between 125°C and 200°C, the useful lifetime of Parylene as a consolidant at 25°C (in the absence of light) is estimated as 2,200 years for N and 130,000 years for C. Incorporation of the antioxidant 4,4′-methylene-bis-(2,6-di-tert-butylphenol) increases the stability substantially but, in view of the very high stability of the pure film, its use in conservation is regarded as non-essential. The effect of light is not considered in this work.
ISSN:0039-3630
2047-0584
DOI:10.1179/sic.1991.36.1.44