Poly (lactic acid) (PLA) and poly(butylene adipate‐co‐terephthalate) (PBAT) are melt blended in a proportion of 50:50 in the presence of diglycidyl ether of bisphenol A (DGEBA) − based epoxy resin, which plays a role of compatibilizing agent and/or chain extender. The increase of torque values during melt mixing and the molar mass of the polymer in the compatibilized blends suggest that DGEBA acts as a chain extender between the polyesters chains. The blend is immiscible with sea‐island type morphology, as suggested by scanning electron microscopy. The addition of 3 phr of DGEBA results in a decrease of domain size and a better interfacial adhesion, which is also confirmed by rheological behavior. An increase of modulus and tensile strength of the blend is also observed by the addition of 3 phr of DGEBA. Dynamic‐mechanical and thermal properties are also investigated. Therefore, this article provides a new strategy for improving the compatibilization of PLA and PBAT biodegradable polyesters and open new possibilities to develop fully biodegradable polymeric materials.
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Pereira et al. (2018) studied this question.
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