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Tài liệu từ anh Quốc Anh, Cty Cao su Đức Minh cung cấp.
ABSTRACT
Initially transparent polybutadiene develops micron-sized surface cracks when stretched and exposed to ozone. The consequent reduction in the transparency of the rubber provides a facile method for quantifying the ambient ozone con-centration. The rate at which opacity develops is linearly dependent on the amount of ozone, and increases with increasing strain. This method of detecting atmospheric ozone has high sensitivity (1 ppb), a broad dynamic range, and is unaffected by the presence of other chemicals. The surface morphology of exposed material can be interpreted in terms of crack nucleation and growth.
INTRODUCTION
Ozone-induced stress cracking is normally considered a problem, diminishing the appearance
and serviceability of rubber products. This cracking is the result of the rapid reaction of ozone with olefinic double bonds to form an ozonide ring…
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