Patterns of fragmentation for polymer coatings
作者:
UlrichA. Handge,
IgorM. Sokolov,
Alexander Blumen,
Evelyne Kolb,
Eric Clément,
期刊:
Journal of Macromolecular Science, Part B
(Taylor Available online 1999)
卷期:
Volume 38,
issue 5-6
页码: 971-980
ISSN:0022-2348
年代: 1999
DOI:10.1080/00222349908248152
出版商: Taylor & Francis Group
关键词: Disordered systems;Fracture mechanics;Fragmentation;Nonlinear elasticity;Pattern formation;Random processes.
数据来源: Taylor
摘要:
We investigated the fragmentation of thin coatings on substrates under uniaxial tension. Theoretical models based on linear elasticity predict a power-law dependence of the mean fragment length <L> on the strain e to which the substrate is subjected: namely, one has <L> ∞ε−αwith α ≤ 1/2. Experimentally, such a relation is obeyed in the fragmentation of thin SiOxcoatings on polyethylene terephthalate (PET) substrates. In our experiments, we used brittle paints to coat rubber substrates: the ensuing mean fragment lengths also obey power laws in ε: we found, however, α = 0.71 ± 0.03. Such values of α can be reproduced theoretically by taking into account the nonlinearity of the coupling between coating and substrate.
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