A Rheological Model of the Influence of Thermal Exposure on the Viscosity of a an LBS-4 Varnish during Impregnation of a Multilayer Woven Blank of a Heat-Protective Coating

A rheological model of LBS-4 bakelite varnish that is used in the fabrication of heat-protective coatings of reentry spacecraft is developed on the basis of experimental data that highlight the dependence of the dynamic viscosity of a varnish on the duration of its long-term storage and thermal-expo...

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Bibliographic Details
Published in:Polymer science. Series D, Glues and sealing materials Glues and sealing materials, 2018-04, Vol.11 (2), p.179-182
Main Authors: Tarasov, V. A., Komkov, M. A., Romanenkov, V. A., Boyarskaya, R. V., Boyarskii, D. S.
Format: Article
Language:English
Subjects:
Bakelite
Chemistry
Chemistry and Materials Science
Impregnation
Multilayers
Polymer Sciences
Protective coatings
Reentry
Rheological properties
Rheology
Vinyl resins
Viscosity
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Summary:A rheological model of LBS-4 bakelite varnish that is used in the fabrication of heat-protective coatings of reentry spacecraft is developed on the basis of experimental data that highlight the dependence of the dynamic viscosity of a varnish on the duration of its long-term storage and thermal-exposure parameters (time and maximum temperature). This model is shown to be useful in the design of impregnation of woven-fiber blanks for the fabrication of composites. The relationships for evaluating the impregnation area under various technological conditions are described as well.
ISSN:1995-4212
1995-4220
DOI:10.1134/S1995421218020193