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Polymerization of organic compounds in an electrodeless glow discharge. X. Internal stress in plasma polymers
Author(s) -
Yasuda H.,
Hirotsu Toshihiro,
Olf H. G.
Publication year - 1977
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1977.070211128
Subject(s) - polymer , materials science , monomer , polymerization , plasma , composite number , substrate (aquarium) , plasma polymerization , composite material , polymer chemistry , coating , stress (linguistics) , modulus , layer (electronics) , linguistics , oceanography , physics , philosophy , quantum mechanics , geology
Owing to the unique mechanisms operative in plasma polymerization, a thin layer of plasma polymer deposited on the surface of a substrate shows a tendency to expand, indicating an internal stress in the layer. This stress, σ s , has been estimated from the observed curling of composite membranes in which the thickness of the plasma coating, d , is much smaller than the thickness of a flexible substrate, D , according to the relation\documentclass{article}\pagestyle{empty}\begin{document}$$ \sigma _S = ED^2 /6Rd $$\end{document} where R is the radius of the roll into which the composite films curl up and E is the modulus of the substrate polymer. The stress σ s is found to depend on the kind of monomer used and to be of the order of magnitude 10 8 –10 9 dynes/cm 2 with most of the monomers here employed.