Abstract
The use of chlorofluorocarbons (CFC) and hydrochlorofluorocarbons (HCFC) has been greatly limited in recent years because of their high ozone depletion potential (ODP) (Montreal protocol). The manufacturers of refrigerators have tried various new blowing agents for polyurethane (PU) foams used as insulating panels, and currently the chosen organic compound in Europe seems to be cyclopentane (CP), due to its acceptable insulating power and null ODP and toxicity. Unfortunately the interaction of CP with high impact polystyrene (HIPS) panels of the refrigerators produces blisters and can possibly induce environmental stress cracking (ESC). The aim of this work is, then, to explain the growth of blisters with a theoretical calculation and also to investigate the mechanical behaviour of HIPS in contact with gaseous and liquid CP, in comparison with usually used Freon® 11 (F11).
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