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Poly(lactic acid) (PLA)/poly(butylene adipate-co-terephthalate) (PBAT) blends using amino-ended hyperbranched polymers (HBP) as modifiers were prepared by melt-mixing through a double-roller mill and injection molding. It was found that when the content of HBP was 2.5 phr, the elongation at break and the impact strength of PLA/PBAT blends both reached peak values. Moreover, by addition of HBP, the ΔTg of the blends was smaller. These results, together with Scanning electron microscope (SEM) images on the fractured morphology of the blends, indicate that the compatibility between PLA and PBAT is improved upon addition of HBP. The mechanism of the impact of HBP on the improvement of the compatibility between PLA and PBAT is proposed based upon Fourier transform infrared (FTIR) spectra.

An investigation of the impact of an amino-ended hyperbranched polymer as a new type of modifier on the compatibility of PLA/PBAT blends