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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2009

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Parylene coatings on biological specimens

Nosal A., Zydorczyk A., Sobczyk-Guzenda A., Głuchowski L., Szymanowski H., Gazicki-Lipman M.

Journal of Achievements in Materials and Manufacturing Engineering

2009

Vol. 37, nr 2

442-447

Purpose: of this paper is show how parylene coatings can protect biological specimens. Design/methodology/approach: Parylene technology is a process, in which a thin polymer film of a very uniform thickness is deposited onto the entire surface of any object placed in the reactor. The polymer, either poly-para-xylylene or one of its ring substituted derivatives, is characterized by excellent mechanical and dielectric [1] as well as barrier [2] properties, at the same time being transparent in the entire visible range of radiation. The process takes place at room temperature, which permits to use virtually any material as substrate. Findings: The following work reports results of parylene application to the conservation of such natural objects, as Pieris brassicae butterflies, Pygocentrus piranya pirania fish and Quercus L. oak leaves. The number of specimens was always divided in two, of which one part was coated with 4 micrometers of Parylene C while the other remained uncoated as a reference sample. All the specimen were then placed on the surface of garden soil and kept there at constant temperature of 37°C and constant humidity of 75%, where their disintegration was followed by means of optical microscopy. After several months of staying under these conditions all the coated specimens were intact remaining their full integrity and colors. In contrast to that, the uncoated fish began to decompose after nine days, the uncoated butterflies after twenty one days and uncoated leaves after three months. Practical implications: A very tight deposition, at room temperature of such a coating onto practically any object obviously focuses an attention of conservators of both natural and cultural human heritage [3-6]. Probably the most important advantage of this technology is its extraordinary penetration ability. When coating a fabric, for instance, this feature allows one to deposit parylene film onto single fibers, leaving open space in-between and simultaneously reinforcing the knots. This is the reason why parylene technology is most often used in the conservation of paper [5] and silk [6]. Originality/value: The originality of present investigation is in application of parylene coatings. The method should be interest for the conservation applications.