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Melt blending of polylactide (PLA), poly(ε-caprolactone) (PCL), and wood flour (WF) was performed in an effort to overcome the major drawbacks (brittleness and high price) of PLA. In addition, the acrylic acid (AA)-grafted PLA 70 PCL 30  (PLA 70 PCL 30 -g-AA) was used as the alternative for the preparation of ternary blends to improve the compatibility and the dispersability of WF within the PLA 70 PCL 30  matrix. As expected, PCL improved the elongation at break and the toughness of PLA but decreased the tensile strength and modulus. Because the hydrophilic WF is dispersed physically in the hydrophobic PLA 70 PCL 30  matrix, as the result of Fourier transform infrared analysis, the mechanical properties of PLA 70 PCL 30  became noticeably worse when it was blended with WF. This problem was successfully conquered by using PLA 70 PCL 30 -g-AA to replace PLA 70 PCL 30  due to the formation of an ester carbonyl group between PLA 70 PCL 30 -g-AA and WF. Furthermore, the PLA 70 PCL 30 -g-AA/WF blend provided a plateau tensile strength at break when the WF content was up to 50 wt%. PLA 70 PCL 30 /WF exhibited a tensile strength at break of approximately 3–25 MPa more than PLA 70 PCL 30 -g-AA/WF. By using  p -cresol and tyrosinase, the enzymatic biodegradable test showed that PLA 70 PCL 30 -g-AA is somewhat more biodegradable than PLA 70 PCL 30  because the former has better water absorption. After 16 weeks, the weight loss of the PLA 70 PCL 30 /WF (50 wt%) composite was &gt;80%. PLA 70 PCL 30 -g-AA/WF exhibited a weight loss of approximately 1–12 wt% more than PLA 70 PCL 30 -g-AA/WF. It was also found that the addition of WF to PLA 70 PCL 30  or PLA 70 PCL 30 -g-AA decreased the crystallinity of PLA and PCL in PLA 70 PCL 30  or PLA 70 PCL 30 -g-AA and then increased their biodegradable property.

Preparation and characterizations of ternary biodegradable blends composed of polylactide, poly(ε-caprolactone), and wood flour