Effect of processing on the environmental stress cracking resistance of high-impact polystyrene |
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| Affiliation: | 1. Politecnico di Milano, Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta”, Piazza L. Da Vinci, 32, Milano Italy;2. Versalis SpA, Basic Chemicals & Plastics Research Center, Via G. Taliercio, 14, Mantova Italy;1. Third Medical Center of Chinese PLA General Hospital, Beijing, China;2. Department of Medicine, Section of Pulmonary and Critical Care and Sleep Medicine, Yale University School of Medicine, New Haven, CT;1. Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin, 150080, PR China;2. Shanghai Qifan Wire and Cable Co., Ltd., Shanghai, 200008, PR China;1. ASV Santé, 125 avenue Roche, 92230 Gennevilliers, France;2. AP-HP, Hôpital Necker, Pediatric noninvasive ventilation and sleep unit, 149 rue de Sèvres, 75015 Paris, France;3. AP-HP, Hôpital Armand Trousseau, Pediatric Pulmonary Department, 26 avenue du Dr Netter, 75012 Paris, France;4. ADEP Assistance, 2 rue Benoit Malon, 92150 Suresnes, France;5. AP-HP, Hôpital Necker, Pediatric Pulmonary Department, 149 rue de Sèvres, 75015 Paris, France;6. INSERM UMR S-938, UMPC Paris 6 University, 27 rue Chaligny, 75012 Paris, France;7. UMPC Paris 6 University, 4 place Jussieu, 75005 Paris, France;8. INSERM U 955, Equipe 13, 8 rue du Général Sarrail, 94010 Créteil, France;9. Paris Descartes University, 12 rue Ecole de Médecine, 75006 Paris, France;1. College of Textiles, Donghua University, Shanghai 201620, PR China;2. Department of Mechanical Engineering, University of Delaware, Newark, DE 19716, USA;3. Center for Composite Materials, University of Delaware, Newark, DE 19716, USA;4. Materials Engineering Division, Lawrence Livermore National Laboratory, CA 94550, USA;5. Department of Electrical and Computer Engineering, University of Delaware, Newark, DE 19716, USA |
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| Abstract: | Processing conditions have a strong effect on the final mechanical properties of products made of polymeric materials. Relevant phenomena most commonly include thermal stresses, physical ageing, frozen-in strains and molecular orientation. In this work, two different high-impact polystyrenes, processed by thermoforming, were considered: a “standard” one and a grade specifically resistant to Environmental Stress Cracking (ESC). The main effect induced by thermoforming was molecular orientation. The local degree of orientation was measured on a thermoformed product and its effect on the material ESC behavior in sunflower oil was studied. A Fracture Mechanics approach was applied to evaluate the fracture resistance of the two materials. Results show that a higher degree of orientation increases the fracture resistance in air but has no effect on the (expectedly lower) resistance in the active oil environment. |
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| Keywords: | Polystyrene Environmental stress cracking Processing Fracture |
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