Investigation of interfacial compatibility of different biopolymers by compounding


Binnaz Coskunkan, Sinem Erkmen

Today, bioplastics are a sustainable alternative solution to problems such as exhaustion of fossil fuels and increasing environmental pollution. Poly (lactic acid) (PLA) that is a type of bio-based polymer with impressive properties such as biodegradability and processibility has found widespread applications in the area of single use materials, medical materials and film applications. However, PLA has disadvantages such as high brittleness and low impact strength. Compounding PLA with other polymers is recommended to improve PLA properties without compromising its biodegradability. In this project, PLA compounded with PBAT to overcome brittleness and low impact strength. The observed that the interfacial compatibility between PLA and PBAT is poor, so these polymers are immiscible. For this reason, compatibilizer is necessary in PLA/PBAT compounded. The mechanical properties such as tensile strength, izod impact strength, and tensile modulus are investigated. Izod impact strength of neat PLA increased 45% approximately and 64% with compatibilizer. This increase shows the enhancement of compatibilization with addition. While the tensile strength values of neat PLA and compound PLA were compared, it was observed that the tensile strength value decreased 25% as consequence of adding PBAT which affects as an impact modifier.

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