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Effect of chain extender and water-quenching on the properties of poly(3-hydroxybutyrate-co-4-hydroxybutyrate) foams for its production by extrusion foaming Ventura Casellas, Heura Laguna-Gutiérrez, Ester Rodríguez Pérez, Miguel Ángel Ardanuy Raso, Mònica Universitat Politècnica de Catalunya. Departament d'Enginyeria Tèxtil i Paperera Universitat Politècnica de Catalunya. TECTEX - Grup de Recerca en Tecnologia Tèxtil Àrees temàtiques de la UPC::Enginyeria química::Indústries químiques::Química tèxtil Poly-beta-hydroxybutyrate Biopolymers Extrusion process Polyesters Poly(3-hydoxybutyrate-co-4-hydroxybutyrate) Biopolymer Chain extender Extrusion foaming Mechanical characterisation Biopolímers Polièsters Extrusió Bacterial polyesters such as polyhydroxyalkanoates (PHAs) are of great interest for a large number of applications both because of their properties and because they come from renewable resources, despite having a higher cost than commodity polymers. Their foaming—although it presents some difficulties—could be an option to increase their competitiveness. In this work, two strategies have been studied to enhance the poly(3-hydoxybutyrate-co-4-hydroxybutyrate) (P3HB4HB) foamability by extrusion foaming. The effect of the cooling system (water-quenching or air-cooling), chain extender (CE) addition and chemical blowing agent (CBA) amount were evaluated. Density, cellular morphology, mechanical and thermal properties were studied. Optimal density reduction was achieved with use of CE and 3–4 wt.% of CBA masterbatch. The most effective strategy on density reduction was the addition of CE, while the water quenching had only a slight influence on the samples in which CE was not present. CE addition decreased the viscosity and the degradation rate of the polymer, thus leading to lighter foams with larger cells but with equal or even slightly better resistance to compressive and tensile stress, in general terms Postprint (author's final draft) 2016-10-01 Article Ventura, H., Laguna-Gutiérrez, E., Rodríguez-Pérez , M., Ardanuy, M. Effect of chain extender and water-quenching on the properties of poly(3-hydroxybutyrate-co-4-hydroxybutyrate) foams for its production by extrusion foaming. "European polymer journal", 1 Octubre 2016, vol. 85, p. 14-25. 0014-3057 https://hdl.handle.net/2117/90797 10.1016/j.eurpolymj.2016.10.001 eng http://www.sciencedirect.com/science/article/pii/S0014305716303743 http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Open Access 12 p. application/pdf