How cracks in SiOx-coated polyester films affect gas permeation
2001; Elsevier BV; Volume: 397; Issue: 1-2 Linguagem: Inglês
10.1016/s0040-6090(01)01473-0
ISSN1879-2731
AutoresM. Yanaka, Bernard M. Henry, Anthony P. Roberts, C.R.M. Grovenor, G. A. D. Briggs, A. P. Sutton, Takashi Miyamoto, Yusuke Tsukahara, N. Takeda, Richard J. Chater,
Tópico(s)Silicone and Siloxane Chemistry
ResumoIn this paper theoretical models have been established that can account for the gas transmission through nanocomposite laminates, consisting of an oxide layer of finite permeability containing defects, on a polymer sheet of finite thickness. The defect shapes can either be in the form of long cracks or rectangular holes. The models offer a choice of exact numerical calculations or fast and intuitive analytical approximations. The experimental measurements of oxygen permeation through four different SiOx/poly(ethylene terephthalate) samples that were strained to produce distributions of cracks showed good agreement when compared with predicted results from the approximate analytic model. As a consequence of this observation, a key practical conclusion is that, because of the logarithmic dependence of transmission on the width of a crack, for a given strain it is better to have a small number of large cracks rather than a large number of small cracks.
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