Wu Chin-San
Department of Biochemical Engineering and Graduate Institute of Environmental Polymer Materials, Kao Yuan Institute of Technology, Kaohsiung County, Taiwan 82101, Republic of China.
Macromol Biosci. 2005 Apr 19;5(4):352-61. doi: 10.1002/mabi.200400159.
In this article, the properties of a polylactide and starch composite (PLA/starch) and an acrylic acid grafted polylactide and starch composite (PLA-g-AA/starch) were compared. The composite containing PLA-g-AA was found to have much better dispersion and homogeneity of starch in the polymer matrix than the composite containing PLA, indicating better compatibility between the two phases. Better mechanical and thermal properties of the PLA-g-AA/starch composite, notably an increase in tensile strength and elongation at breakpoint, evidenced its superiority to the PLA/starch composite. Furthermore, the lower viscosity of PLA-g-AA/starch makes it easier to process than PLA/starch. Weight loss on exposure to a soil environment over a period of three months showed that the starch in the composites was almost completely biodegradable, even at a high degree of substitution (60 wt.-% starch). After three months in soil, a reduction in the mechanical properties of the blends was observed, especially in those with higher starch contents.
在本文中，对聚乳酸与淀粉复合材料（PLA/淀粉）和丙烯酸接枝聚乳酸与淀粉复合材料（PLA-g-AA/淀粉）的性能进行了比较。结果发现，与含PLA的复合材料相比，含PLA-g-AA的复合材料中淀粉在聚合物基体中的分散性和均匀性要好得多，这表明两相之间具有更好的相容性。PLA-g-AA/淀粉复合材料具有更好的机械性能和热性能，特别是拉伸强度和断裂伸长率有所提高，证明了其优于PLA/淀粉复合材料。此外，PLA-g-AA/淀粉的较低粘度使其比PLA/淀粉更易于加工。在土壤环境中暴露三个月后的重量损失表明，复合材料中的淀粉几乎完全可生物降解，即使在高取代度（60重量-%淀粉）下也是如此。在土壤中放置三个月后，观察到共混物的机械性能有所下降，尤其是淀粉含量较高的共混物。
