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Effect of different compatibilizers on environmentally friendly composites from poly(lactic acid) and diatomaceous earth

Injection moulded composites based on poly(lactic acid) and 10?wt% diatomaceous earth with different compatibilizers present a potential solution for active packaging and show interesting mechanical behaviour and good biodegradability.Environmentally friendly composites from poly(lactic acid) (PLA) and diatomaceous earth (DE) were successfully manufactured by extrusion, followed by injection moulding. DE was used as a filler; several compatibilizer/coupling agents, namely (3?glycidyloxypropyl)trimethoxysilane, epoxy styrene acrylic oligomer and maleinized linseed oil, were used to improve polymer–filler interactions. Mechanical characterization was carried out by standard tensile, impact and hardness tests while morphological characterization of the fractured surfaces was conducted by field emission scanning electron microscopy. The effect of DE was evaluated by differential scanning calorimetry and dynamic mechanical thermal behaviour. The results show that the addition of DE provides an improved tensile modulus and induces more brittle composites due to stress concentration phenomena. The addition of compatibilizers in PLA?DE positively contributes to improve ductile properties, thus leading to high environmental efficiency materials with balanced mechanical properties. Specifically, the compatibility improvement between the PLA and DE was good with maleinized linseed oil and contributed to improving the impact strength, which is a key factor in PLA?based composites due to the intrinsic brittleness of neat PLA. © 2019 Society of Chemical Industry

» Author: Angel Aguero, Luis Quiles?Carrillo, Amparo Jorda?Vilaplana, Octavio Fenollar, Nestor Montanes

» Reference: doi:10.1002/pi.5779

» Publication Date: 28/02/2019

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This project has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement n° [605658].

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